diff --git a/.gitignore b/.gitignore
index ea8c4bf..23951b0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 /target
+web/dist
+web/target
diff --git a/Cargo.lock b/Cargo.lock
index c5085cb..d61abf2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -14,6 +14,13 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3a8241f3ebb85c056b509d4327ad0358fbbba6ffb340bf388f26350aeda225b1"
 
+[[package]]
+name = "cli"
+version = "0.1.0"
+dependencies = [
+ "ordo",
+]
+
 [[package]]
 name = "downcast-rs"
 version = "1.2.0"
@@ -124,18 +131,18 @@ checksum = "de3145af08024dea9fa9914f381a17b8fc6034dfb00f3a84013f7ff43f29ed4c"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.69"
+version = "1.0.76"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "134c189feb4956b20f6f547d2cf727d4c0fe06722b20a0eec87ed445a97f92da"
+checksum = "95fc56cda0b5c3325f5fbbd7ff9fda9e02bb00bb3dac51252d2f1bfa1cb8cc8c"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.33"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -148,9 +155,9 @@ checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
 
 [[package]]
 name = "smallvec"
-version = "1.11.2"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4dccd0940a2dcdf68d092b8cbab7dc0ad8fa938bf95787e1b916b0e3d0e8e970"
+checksum = "2593d31f82ead8df961d8bd23a64c2ccf2eb5dd34b0a34bfb4dd54011c72009e"
 
 [[package]]
 name = "spin"
@@ -160,9 +167,9 @@ checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
 
 [[package]]
 name = "syn"
-version = "2.0.38"
+version = "2.0.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e96b79aaa137db8f61e26363a0c9b47d8b4ec75da28b7d1d614c2303e232408b"
+checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 1135da5..a77c443 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,12 +1,3 @@
-[package]
-name = "ordo"
-version = "0.1.0"
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]
-itertools = "0.12.0"
-logos = "0.13.0"
-wasmi = "0.31.1"
-wat = "1.0.83"
+[workspace]
+members = ["cli", "ordo"]
+exclude = ["web"]
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
new file mode 100644
index 0000000..60ba167
--- /dev/null
+++ b/cli/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "cli"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+ordo = { path = "../ordo" }
diff --git a/src/main.rs b/cli/src/main.rs
similarity index 51%
rename from src/main.rs
rename to cli/src/main.rs
index b098aff..fa570bb 100644
--- a/src/main.rs
+++ b/cli/src/main.rs
@@ -1,84 +1,6 @@
-use core::make_env;
-use std::{
-    fmt,
-    io::{self, stdout, BufRead, Write},
-};
+use std::io::{self, stdout, BufRead, Write};
 
-use parser::Parser;
-
-pub mod core;
-pub mod emit;
-pub mod eval;
-pub mod expr;
-pub mod infer;
-pub mod lexer;
-pub mod parser;
-
-#[derive(Debug)]
-enum Error {
-    Parser(parser::Error),
-    Infer(infer::Error),
-    Eval(eval::Error),
-}
-
-impl From<parser::Error> for Error {
-    fn from(value: parser::Error) -> Self {
-        Self::Parser(value)
-    }
-}
-
-impl From<infer::Error> for Error {
-    fn from(value: infer::Error) -> Self {
-        Self::Infer(value)
-    }
-}
-
-impl From<eval::Error> for Error {
-    fn from(value: eval::Error) -> Self {
-        Self::Eval(value)
-    }
-}
-
-impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Error::Parser(p) => write!(f, "parser: {}", p),
-            Error::Infer(i) => write!(f, "infer: {}", i),
-            Error::Eval(e) => write!(f, "eval: {}", e),
-        }
-    }
-}
-
-type Result<T, E = Error> = std::result::Result<T, E>;
-
-struct Output {
-    ty: String,
-    val: String,
-}
-
-struct Env {
-    infer: infer::Env,
-    eval: eval::Env,
-}
-
-impl Default for Env {
-    fn default() -> Self {
-        let infer = make_env();
-        let eval = Default::default();
-        Self { infer, eval }
-    }
-}
-
-impl Env {
-    fn process(&mut self, source: &str) -> Result<Output> {
-        let expr = Parser::repl(source)?;
-        let typed_expr = self.infer.infer(expr.clone())?;
-        let value = self.eval.eval(&expr)?;
-        let ty = self.infer.ty_to_string(typed_expr.ty()).unwrap();
-        let val = value.to_string();
-        Ok(Output { ty, val })
-    }
-}
+use ordo::env::Env;
 
 const ORDO: &str = "ordo>>> ";
 const ERROR: &str = "error: ";
@@ -110,7 +32,7 @@ fn main() {
 
 #[test]
 fn readme_test() {
-    let file = std::fs::read_to_string("README.md").unwrap();
+    let file = std::fs::read_to_string("../README.md").unwrap();
     let lines: Vec<&str> = file.lines().collect();
     let mut i = 0;
 
@@ -155,31 +77,3 @@ fn readme_test() {
         }
     }
 }
-
-#[cfg(test)]
-#[path = "tests/ifs.rs"]
-mod ifs;
-
-#[cfg(test)]
-#[path = "tests/unwraps.rs"]
-mod unwraps;
-
-#[cfg(test)]
-#[path = "tests/parse_only.rs"]
-mod parse_only;
-
-#[cfg(test)]
-#[path = "tests/parse_at.rs"]
-mod parse_at;
-
-#[cfg(test)]
-#[path = "tests/infer_tests.rs"]
-mod infer_tests;
-
-#[cfg(test)]
-#[path = "tests/typed_exprs.rs"]
-mod typed_exprs;
-
-#[cfg(test)]
-#[path = "tests/emit_tests.rs"]
-mod emit_tests;
diff --git a/docs/index.html b/docs/index.html
new file mode 100644
index 0000000..c10c717
--- /dev/null
+++ b/docs/index.html
@@ -0,0 +1,15 @@
+<html><head>
+        <meta charset="utf-8">
+        <link href="https://fonts.cdnfonts.com/css/source-code-pro" rel="stylesheet">
+        <title>ordo</title>
+        <style>
+            body {
+                font-family: "Source Code Pro", sans-serif;
+            }
+        </style>
+    
+<link rel="preload" href="/web-78a67224672b0005_bg.wasm" as="fetch" type="application/wasm" crossorigin="">
+<link rel="modulepreload" href="/web-78a67224672b0005.js"></head>
+    <body>
+
+<script type="module">import init from '/web-78a67224672b0005.js';init('/web-78a67224672b0005_bg.wasm');</script></body></html>
\ No newline at end of file
diff --git a/docs/web-78a67224672b0005.js b/docs/web-78a67224672b0005.js
new file mode 100644
index 0000000..81c90a6
--- /dev/null
+++ b/docs/web-78a67224672b0005.js
@@ -0,0 +1,715 @@
+let wasm;
+
+const cachedTextDecoder = (typeof TextDecoder !== 'undefined' ? new TextDecoder('utf-8', { ignoreBOM: true, fatal: true }) : { decode: () => { throw Error('TextDecoder not available') } } );
+
+if (typeof TextDecoder !== 'undefined') { cachedTextDecoder.decode(); };
+
+let cachedUint8Memory0 = null;
+
+function getUint8Memory0() {
+    if (cachedUint8Memory0 === null || cachedUint8Memory0.byteLength === 0) {
+        cachedUint8Memory0 = new Uint8Array(wasm.memory.buffer);
+    }
+    return cachedUint8Memory0;
+}
+
+function getStringFromWasm0(ptr, len) {
+    ptr = ptr >>> 0;
+    return cachedTextDecoder.decode(getUint8Memory0().subarray(ptr, ptr + len));
+}
+
+const heap = new Array(128).fill(undefined);
+
+heap.push(undefined, null, true, false);
+
+let heap_next = heap.length;
+
+function addHeapObject(obj) {
+    if (heap_next === heap.length) heap.push(heap.length + 1);
+    const idx = heap_next;
+    heap_next = heap[idx];
+
+    heap[idx] = obj;
+    return idx;
+}
+
+function getObject(idx) { return heap[idx]; }
+
+function dropObject(idx) {
+    if (idx < 132) return;
+    heap[idx] = heap_next;
+    heap_next = idx;
+}
+
+function takeObject(idx) {
+    const ret = getObject(idx);
+    dropObject(idx);
+    return ret;
+}
+
+function debugString(val) {
+    // primitive types
+    const type = typeof val;
+    if (type == 'number' || type == 'boolean' || val == null) {
+        return  `${val}`;
+    }
+    if (type == 'string') {
+        return `"${val}"`;
+    }
+    if (type == 'symbol') {
+        const description = val.description;
+        if (description == null) {
+            return 'Symbol';
+        } else {
+            return `Symbol(${description})`;
+        }
+    }
+    if (type == 'function') {
+        const name = val.name;
+        if (typeof name == 'string' && name.length > 0) {
+            return `Function(${name})`;
+        } else {
+            return 'Function';
+        }
+    }
+    // objects
+    if (Array.isArray(val)) {
+        const length = val.length;
+        let debug = '[';
+        if (length > 0) {
+            debug += debugString(val[0]);
+        }
+        for(let i = 1; i < length; i++) {
+            debug += ', ' + debugString(val[i]);
+        }
+        debug += ']';
+        return debug;
+    }
+    // Test for built-in
+    const builtInMatches = /\[object ([^\]]+)\]/.exec(toString.call(val));
+    let className;
+    if (builtInMatches.length > 1) {
+        className = builtInMatches[1];
+    } else {
+        // Failed to match the standard '[object ClassName]'
+        return toString.call(val);
+    }
+    if (className == 'Object') {
+        // we're a user defined class or Object
+        // JSON.stringify avoids problems with cycles, and is generally much
+        // easier than looping through ownProperties of `val`.
+        try {
+            return 'Object(' + JSON.stringify(val) + ')';
+        } catch (_) {
+            return 'Object';
+        }
+    }
+    // errors
+    if (val instanceof Error) {
+        return `${val.name}: ${val.message}\n${val.stack}`;
+    }
+    // TODO we could test for more things here, like `Set`s and `Map`s.
+    return className;
+}
+
+let WASM_VECTOR_LEN = 0;
+
+const cachedTextEncoder = (typeof TextEncoder !== 'undefined' ? new TextEncoder('utf-8') : { encode: () => { throw Error('TextEncoder not available') } } );
+
+const encodeString = (typeof cachedTextEncoder.encodeInto === 'function'
+    ? function (arg, view) {
+    return cachedTextEncoder.encodeInto(arg, view);
+}
+    : function (arg, view) {
+    const buf = cachedTextEncoder.encode(arg);
+    view.set(buf);
+    return {
+        read: arg.length,
+        written: buf.length
+    };
+});
+
+function passStringToWasm0(arg, malloc, realloc) {
+
+    if (realloc === undefined) {
+        const buf = cachedTextEncoder.encode(arg);
+        const ptr = malloc(buf.length, 1) >>> 0;
+        getUint8Memory0().subarray(ptr, ptr + buf.length).set(buf);
+        WASM_VECTOR_LEN = buf.length;
+        return ptr;
+    }
+
+    let len = arg.length;
+    let ptr = malloc(len, 1) >>> 0;
+
+    const mem = getUint8Memory0();
+
+    let offset = 0;
+
+    for (; offset < len; offset++) {
+        const code = arg.charCodeAt(offset);
+        if (code > 0x7F) break;
+        mem[ptr + offset] = code;
+    }
+
+    if (offset !== len) {
+        if (offset !== 0) {
+            arg = arg.slice(offset);
+        }
+        ptr = realloc(ptr, len, len = offset + arg.length * 3, 1) >>> 0;
+        const view = getUint8Memory0().subarray(ptr + offset, ptr + len);
+        const ret = encodeString(arg, view);
+
+        offset += ret.written;
+    }
+
+    WASM_VECTOR_LEN = offset;
+    return ptr;
+}
+
+let cachedInt32Memory0 = null;
+
+function getInt32Memory0() {
+    if (cachedInt32Memory0 === null || cachedInt32Memory0.byteLength === 0) {
+        cachedInt32Memory0 = new Int32Array(wasm.memory.buffer);
+    }
+    return cachedInt32Memory0;
+}
+
+function makeClosure(arg0, arg1, dtor, f) {
+    const state = { a: arg0, b: arg1, cnt: 1, dtor };
+    const real = (...args) => {
+        // First up with a closure we increment the internal reference
+        // count. This ensures that the Rust closure environment won't
+        // be deallocated while we're invoking it.
+        state.cnt++;
+        try {
+            return f(state.a, state.b, ...args);
+        } finally {
+            if (--state.cnt === 0) {
+                wasm.__wbindgen_export_2.get(state.dtor)(state.a, state.b);
+                state.a = 0;
+
+            }
+        }
+    };
+    real.original = state;
+
+    return real;
+}
+
+let stack_pointer = 128;
+
+function addBorrowedObject(obj) {
+    if (stack_pointer == 1) throw new Error('out of js stack');
+    heap[--stack_pointer] = obj;
+    return stack_pointer;
+}
+function __wbg_adapter_20(arg0, arg1, arg2) {
+    try {
+        wasm._dyn_core__ops__function__Fn___A____Output___R_as_wasm_bindgen__closure__WasmClosure___describe__invoke__h49020ebf76b4216d(arg0, arg1, addBorrowedObject(arg2));
+    } finally {
+        heap[stack_pointer++] = undefined;
+    }
+}
+
+function makeMutClosure(arg0, arg1, dtor, f) {
+    const state = { a: arg0, b: arg1, cnt: 1, dtor };
+    const real = (...args) => {
+        // First up with a closure we increment the internal reference
+        // count. This ensures that the Rust closure environment won't
+        // be deallocated while we're invoking it.
+        state.cnt++;
+        const a = state.a;
+        state.a = 0;
+        try {
+            return f(a, state.b, ...args);
+        } finally {
+            if (--state.cnt === 0) {
+                wasm.__wbindgen_export_2.get(state.dtor)(a, state.b);
+
+            } else {
+                state.a = a;
+            }
+        }
+    };
+    real.original = state;
+
+    return real;
+}
+function __wbg_adapter_23(arg0, arg1, arg2) {
+    wasm._dyn_core__ops__function__FnMut__A____Output___R_as_wasm_bindgen__closure__WasmClosure___describe__invoke__hdddf6c683d9b8e62(arg0, arg1, addHeapObject(arg2));
+}
+
+function isLikeNone(x) {
+    return x === undefined || x === null;
+}
+
+let cachedUint32Memory0 = null;
+
+function getUint32Memory0() {
+    if (cachedUint32Memory0 === null || cachedUint32Memory0.byteLength === 0) {
+        cachedUint32Memory0 = new Uint32Array(wasm.memory.buffer);
+    }
+    return cachedUint32Memory0;
+}
+
+function getArrayJsValueFromWasm0(ptr, len) {
+    ptr = ptr >>> 0;
+    const mem = getUint32Memory0();
+    const slice = mem.subarray(ptr / 4, ptr / 4 + len);
+    const result = [];
+    for (let i = 0; i < slice.length; i++) {
+        result.push(takeObject(slice[i]));
+    }
+    return result;
+}
+
+function handleError(f, args) {
+    try {
+        return f.apply(this, args);
+    } catch (e) {
+        wasm.__wbindgen_exn_store(addHeapObject(e));
+    }
+}
+
+async function __wbg_load(module, imports) {
+    if (typeof Response === 'function' && module instanceof Response) {
+        if (typeof WebAssembly.instantiateStreaming === 'function') {
+            try {
+                return await WebAssembly.instantiateStreaming(module, imports);
+
+            } catch (e) {
+                if (module.headers.get('Content-Type') != 'application/wasm') {
+                    console.warn("`WebAssembly.instantiateStreaming` failed because your server does not serve wasm with `application/wasm` MIME type. Falling back to `WebAssembly.instantiate` which is slower. Original error:\n", e);
+
+                } else {
+                    throw e;
+                }
+            }
+        }
+
+        const bytes = await module.arrayBuffer();
+        return await WebAssembly.instantiate(bytes, imports);
+
+    } else {
+        const instance = await WebAssembly.instantiate(module, imports);
+
+        if (instance instanceof WebAssembly.Instance) {
+            return { instance, module };
+
+        } else {
+            return instance;
+        }
+    }
+}
+
+function __wbg_get_imports() {
+    const imports = {};
+    imports.wbg = {};
+    imports.wbg.__wbindgen_string_new = function(arg0, arg1) {
+        const ret = getStringFromWasm0(arg0, arg1);
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbindgen_object_clone_ref = function(arg0) {
+        const ret = getObject(arg0);
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbindgen_jsval_eq = function(arg0, arg1) {
+        const ret = getObject(arg0) === getObject(arg1);
+        return ret;
+    };
+    imports.wbg.__wbindgen_cb_drop = function(arg0) {
+        const obj = takeObject(arg0).original;
+        if (obj.cnt-- == 1) {
+            obj.a = 0;
+            return true;
+        }
+        const ret = false;
+        return ret;
+    };
+    imports.wbg.__wbg_listenerid_6dcf1c62b7b7de58 = function(arg0, arg1) {
+        const ret = getObject(arg1).__yew_listener_id;
+        getInt32Memory0()[arg0 / 4 + 1] = isLikeNone(ret) ? 0 : ret;
+        getInt32Memory0()[arg0 / 4 + 0] = !isLikeNone(ret);
+    };
+    imports.wbg.__wbg_setlistenerid_f2e783343fa0cec1 = function(arg0, arg1) {
+        getObject(arg0).__yew_listener_id = arg1 >>> 0;
+    };
+    imports.wbg.__wbg_subtreeid_e80a1798fee782f9 = function(arg0, arg1) {
+        const ret = getObject(arg1).__yew_subtree_id;
+        getInt32Memory0()[arg0 / 4 + 1] = isLikeNone(ret) ? 0 : ret;
+        getInt32Memory0()[arg0 / 4 + 0] = !isLikeNone(ret);
+    };
+    imports.wbg.__wbg_setsubtreeid_e1fab6b578c800cf = function(arg0, arg1) {
+        getObject(arg0).__yew_subtree_id = arg1 >>> 0;
+    };
+    imports.wbg.__wbg_cachekey_b81c1aacc6a0645c = function(arg0, arg1) {
+        const ret = getObject(arg1).__yew_subtree_cache_key;
+        getInt32Memory0()[arg0 / 4 + 1] = isLikeNone(ret) ? 0 : ret;
+        getInt32Memory0()[arg0 / 4 + 0] = !isLikeNone(ret);
+    };
+    imports.wbg.__wbg_setcachekey_75bcd45312087529 = function(arg0, arg1) {
+        getObject(arg0).__yew_subtree_cache_key = arg1 >>> 0;
+    };
+    imports.wbg.__wbg_error_f851667af71bcfc6 = function(arg0, arg1) {
+        let deferred0_0;
+        let deferred0_1;
+        try {
+            deferred0_0 = arg0;
+            deferred0_1 = arg1;
+            console.error(getStringFromWasm0(arg0, arg1));
+        } finally {
+            wasm.__wbindgen_free(deferred0_0, deferred0_1, 1);
+        }
+    };
+    imports.wbg.__wbg_new_abda76e883ba8a5f = function() {
+        const ret = new Error();
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_stack_658279fe44541cf6 = function(arg0, arg1) {
+        const ret = getObject(arg1).stack;
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getInt32Memory0()[arg0 / 4 + 1] = len1;
+        getInt32Memory0()[arg0 / 4 + 0] = ptr1;
+    };
+    imports.wbg.__wbindgen_is_undefined = function(arg0) {
+        const ret = getObject(arg0) === undefined;
+        return ret;
+    };
+    imports.wbg.__wbindgen_is_function = function(arg0) {
+        const ret = typeof(getObject(arg0)) === 'function';
+        return ret;
+    };
+    imports.wbg.__wbg_queueMicrotask_118eeb525d584d9a = function(arg0) {
+        queueMicrotask(getObject(arg0));
+    };
+    imports.wbg.__wbg_queueMicrotask_26a89c14c53809c0 = function(arg0) {
+        const ret = getObject(arg0).queueMicrotask;
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_error_a526fb08a0205972 = function(arg0, arg1) {
+        var v0 = getArrayJsValueFromWasm0(arg0, arg1).slice();
+        wasm.__wbindgen_free(arg0, arg1 * 4, 4);
+        console.error(...v0);
+    };
+    imports.wbg.__wbg_instanceof_Window_99dc9805eaa2614b = function(arg0) {
+        let result;
+        try {
+            result = getObject(arg0) instanceof Window;
+        } catch (_) {
+            result = false;
+        }
+        const ret = result;
+        return ret;
+    };
+    imports.wbg.__wbg_document_5257b70811e953c0 = function(arg0) {
+        const ret = getObject(arg0).document;
+        return isLikeNone(ret) ? 0 : addHeapObject(ret);
+    };
+    imports.wbg.__wbg_body_3eb73da919b867a1 = function(arg0) {
+        const ret = getObject(arg0).body;
+        return isLikeNone(ret) ? 0 : addHeapObject(ret);
+    };
+    imports.wbg.__wbg_createElement_1a136faad4101f43 = function() { return handleError(function (arg0, arg1, arg2) {
+        const ret = getObject(arg0).createElement(getStringFromWasm0(arg1, arg2));
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_createElementNS_d47e0c50fa2904e0 = function() { return handleError(function (arg0, arg1, arg2, arg3, arg4) {
+        const ret = getObject(arg0).createElementNS(arg1 === 0 ? undefined : getStringFromWasm0(arg1, arg2), getStringFromWasm0(arg3, arg4));
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_createTextNode_dbdd908f92bae1b1 = function(arg0, arg1, arg2) {
+        const ret = getObject(arg0).createTextNode(getStringFromWasm0(arg1, arg2));
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_instanceof_Element_f614cf57d4316979 = function(arg0) {
+        let result;
+        try {
+            result = getObject(arg0) instanceof Element;
+        } catch (_) {
+            result = false;
+        }
+        const ret = result;
+        return ret;
+    };
+    imports.wbg.__wbg_namespaceURI_0819c2800784a176 = function(arg0, arg1) {
+        const ret = getObject(arg1).namespaceURI;
+        var ptr1 = isLikeNone(ret) ? 0 : passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        var len1 = WASM_VECTOR_LEN;
+        getInt32Memory0()[arg0 / 4 + 1] = len1;
+        getInt32Memory0()[arg0 / 4 + 0] = ptr1;
+    };
+    imports.wbg.__wbg_setinnerHTML_99deeacfff0ae4cc = function(arg0, arg1, arg2) {
+        getObject(arg0).innerHTML = getStringFromWasm0(arg1, arg2);
+    };
+    imports.wbg.__wbg_outerHTML_69934f9195df65af = function(arg0, arg1) {
+        const ret = getObject(arg1).outerHTML;
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getInt32Memory0()[arg0 / 4 + 1] = len1;
+        getInt32Memory0()[arg0 / 4 + 0] = ptr1;
+    };
+    imports.wbg.__wbg_removeAttribute_5c264e727b67dbdb = function() { return handleError(function (arg0, arg1, arg2) {
+        getObject(arg0).removeAttribute(getStringFromWasm0(arg1, arg2));
+    }, arguments) };
+    imports.wbg.__wbg_setAttribute_0918ea45d5a1c663 = function() { return handleError(function (arg0, arg1, arg2, arg3, arg4) {
+        getObject(arg0).setAttribute(getStringFromWasm0(arg1, arg2), getStringFromWasm0(arg3, arg4));
+    }, arguments) };
+    imports.wbg.__wbg_debug_0207b724052e591d = function(arg0, arg1, arg2, arg3) {
+        console.debug(getObject(arg0), getObject(arg1), getObject(arg2), getObject(arg3));
+    };
+    imports.wbg.__wbg_error_1f4e3e298a7c97f6 = function(arg0) {
+        console.error(getObject(arg0));
+    };
+    imports.wbg.__wbg_error_8cf137381b3af25f = function(arg0, arg1, arg2, arg3) {
+        console.error(getObject(arg0), getObject(arg1), getObject(arg2), getObject(arg3));
+    };
+    imports.wbg.__wbg_info_eb81e4fcae9ba8f1 = function(arg0, arg1, arg2, arg3) {
+        console.info(getObject(arg0), getObject(arg1), getObject(arg2), getObject(arg3));
+    };
+    imports.wbg.__wbg_log_bd0951a507fbf762 = function(arg0, arg1, arg2, arg3) {
+        console.log(getObject(arg0), getObject(arg1), getObject(arg2), getObject(arg3));
+    };
+    imports.wbg.__wbg_warn_ea08466617ec5d3a = function(arg0, arg1, arg2, arg3) {
+        console.warn(getObject(arg0), getObject(arg1), getObject(arg2), getObject(arg3));
+    };
+    imports.wbg.__wbg_parentNode_f3957fdd408a62f7 = function(arg0) {
+        const ret = getObject(arg0).parentNode;
+        return isLikeNone(ret) ? 0 : addHeapObject(ret);
+    };
+    imports.wbg.__wbg_parentElement_86a7612dde875ba9 = function(arg0) {
+        const ret = getObject(arg0).parentElement;
+        return isLikeNone(ret) ? 0 : addHeapObject(ret);
+    };
+    imports.wbg.__wbg_childNodes_75d3da5f3a7bb985 = function(arg0) {
+        const ret = getObject(arg0).childNodes;
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_lastChild_8f7b6f3825115eff = function(arg0) {
+        const ret = getObject(arg0).lastChild;
+        return isLikeNone(ret) ? 0 : addHeapObject(ret);
+    };
+    imports.wbg.__wbg_nextSibling_13e9454ef5323f1a = function(arg0) {
+        const ret = getObject(arg0).nextSibling;
+        return isLikeNone(ret) ? 0 : addHeapObject(ret);
+    };
+    imports.wbg.__wbg_setnodeValue_8656e865e9b11bbb = function(arg0, arg1, arg2) {
+        getObject(arg0).nodeValue = arg1 === 0 ? undefined : getStringFromWasm0(arg1, arg2);
+    };
+    imports.wbg.__wbg_textContent_efe8338af53ddf62 = function(arg0, arg1) {
+        const ret = getObject(arg1).textContent;
+        var ptr1 = isLikeNone(ret) ? 0 : passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        var len1 = WASM_VECTOR_LEN;
+        getInt32Memory0()[arg0 / 4 + 1] = len1;
+        getInt32Memory0()[arg0 / 4 + 0] = ptr1;
+    };
+    imports.wbg.__wbg_cloneNode_80501c66ab115588 = function() { return handleError(function (arg0) {
+        const ret = getObject(arg0).cloneNode();
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_insertBefore_882082ef4c5d7766 = function() { return handleError(function (arg0, arg1, arg2) {
+        const ret = getObject(arg0).insertBefore(getObject(arg1), getObject(arg2));
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_removeChild_14b08321b677677a = function() { return handleError(function (arg0, arg1) {
+        const ret = getObject(arg0).removeChild(getObject(arg1));
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_setchecked_3b12f3d602a63e47 = function(arg0, arg1) {
+        getObject(arg0).checked = arg1 !== 0;
+    };
+    imports.wbg.__wbg_value_c93cb4b4d352228e = function(arg0, arg1) {
+        const ret = getObject(arg1).value;
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getInt32Memory0()[arg0 / 4 + 1] = len1;
+        getInt32Memory0()[arg0 / 4 + 0] = ptr1;
+    };
+    imports.wbg.__wbg_setvalue_9bd3f93b3864ddbf = function(arg0, arg1, arg2) {
+        getObject(arg0).value = getStringFromWasm0(arg1, arg2);
+    };
+    imports.wbg.__wbg_addEventListener_1b158e9e95e0ab00 = function() { return handleError(function (arg0, arg1, arg2, arg3, arg4) {
+        getObject(arg0).addEventListener(getStringFromWasm0(arg1, arg2), getObject(arg3), getObject(arg4));
+    }, arguments) };
+    imports.wbg.__wbg_removeEventListener_177ff96081e6f22d = function() { return handleError(function (arg0, arg1, arg2, arg3, arg4) {
+        getObject(arg0).removeEventListener(getStringFromWasm0(arg1, arg2), getObject(arg3), arg4 !== 0);
+    }, arguments) };
+    imports.wbg.__wbg_keyCode_6acbcd0e4e062504 = function(arg0) {
+        const ret = getObject(arg0).keyCode;
+        return ret;
+    };
+    imports.wbg.__wbg_value_ab23a75318ea828f = function(arg0, arg1) {
+        const ret = getObject(arg1).value;
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getInt32Memory0()[arg0 / 4 + 1] = len1;
+        getInt32Memory0()[arg0 / 4 + 0] = ptr1;
+    };
+    imports.wbg.__wbg_setvalue_918a8ae77531a942 = function(arg0, arg1, arg2) {
+        getObject(arg0).value = getStringFromWasm0(arg1, arg2);
+    };
+    imports.wbg.__wbg_target_791826e938c3e308 = function(arg0) {
+        const ret = getObject(arg0).target;
+        return isLikeNone(ret) ? 0 : addHeapObject(ret);
+    };
+    imports.wbg.__wbg_bubbles_f0783dc095f8e220 = function(arg0) {
+        const ret = getObject(arg0).bubbles;
+        return ret;
+    };
+    imports.wbg.__wbg_cancelBubble_191799b8e0ab3254 = function(arg0) {
+        const ret = getObject(arg0).cancelBubble;
+        return ret;
+    };
+    imports.wbg.__wbg_composedPath_d94a39b8c8f6eed1 = function(arg0) {
+        const ret = getObject(arg0).composedPath();
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_instanceof_ShadowRoot_cb6366cb0956ce29 = function(arg0) {
+        let result;
+        try {
+            result = getObject(arg0) instanceof ShadowRoot;
+        } catch (_) {
+            result = false;
+        }
+        const ret = result;
+        return ret;
+    };
+    imports.wbg.__wbg_host_99e27ed8897850f2 = function(arg0) {
+        const ret = getObject(arg0).host;
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_get_c43534c00f382c8a = function(arg0, arg1) {
+        const ret = getObject(arg0)[arg1 >>> 0];
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_from_a663e01d8dab8e44 = function(arg0) {
+        const ret = Array.from(getObject(arg0));
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_length_d99b680fd68bf71b = function(arg0) {
+        const ret = getObject(arg0).length;
+        return ret;
+    };
+    imports.wbg.__wbg_newnoargs_5859b6d41c6fe9f7 = function(arg0, arg1) {
+        const ret = new Function(getStringFromWasm0(arg0, arg1));
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_call_a79f1973a4f07d5e = function() { return handleError(function (arg0, arg1) {
+        const ret = getObject(arg0).call(getObject(arg1));
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_is_a5728dbfb61c82cd = function(arg0, arg1) {
+        const ret = Object.is(getObject(arg0), getObject(arg1));
+        return ret;
+    };
+    imports.wbg.__wbg_new_87d841e70661f6e9 = function() {
+        const ret = new Object();
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_resolve_97ecd55ee839391b = function(arg0) {
+        const ret = Promise.resolve(getObject(arg0));
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_then_7aeb7c5f1536640f = function(arg0, arg1) {
+        const ret = getObject(arg0).then(getObject(arg1));
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_globalThis_e5f801a37ad7d07b = function() { return handleError(function () {
+        const ret = globalThis.globalThis;
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_self_086b5302bcafb962 = function() { return handleError(function () {
+        const ret = self.self;
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_window_132fa5d7546f1de5 = function() { return handleError(function () {
+        const ret = window.window;
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_global_f9a61fce4af6b7c1 = function() { return handleError(function () {
+        const ret = global.global;
+        return addHeapObject(ret);
+    }, arguments) };
+    imports.wbg.__wbg_set_37a50e901587b477 = function() { return handleError(function (arg0, arg1, arg2) {
+        const ret = Reflect.set(getObject(arg0), getObject(arg1), getObject(arg2));
+        return ret;
+    }, arguments) };
+    imports.wbg.__wbindgen_debug_string = function(arg0, arg1) {
+        const ret = debugString(getObject(arg1));
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getInt32Memory0()[arg0 / 4 + 1] = len1;
+        getInt32Memory0()[arg0 / 4 + 0] = ptr1;
+    };
+    imports.wbg.__wbindgen_object_drop_ref = function(arg0) {
+        takeObject(arg0);
+    };
+    imports.wbg.__wbindgen_throw = function(arg0, arg1) {
+        throw new Error(getStringFromWasm0(arg0, arg1));
+    };
+    imports.wbg.__wbindgen_closure_wrapper1894 = function(arg0, arg1, arg2) {
+        const ret = makeClosure(arg0, arg1, 153, __wbg_adapter_20);
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbindgen_closure_wrapper3290 = function(arg0, arg1, arg2) {
+        const ret = makeMutClosure(arg0, arg1, 262, __wbg_adapter_23);
+        return addHeapObject(ret);
+    };
+
+    return imports;
+}
+
+function __wbg_init_memory(imports, maybe_memory) {
+
+}
+
+function __wbg_finalize_init(instance, module) {
+    wasm = instance.exports;
+    __wbg_init.__wbindgen_wasm_module = module;
+    cachedInt32Memory0 = null;
+    cachedUint32Memory0 = null;
+    cachedUint8Memory0 = null;
+
+    wasm.__wbindgen_start();
+    return wasm;
+}
+
+function initSync(module) {
+    if (wasm !== undefined) return wasm;
+
+    const imports = __wbg_get_imports();
+
+    __wbg_init_memory(imports);
+
+    if (!(module instanceof WebAssembly.Module)) {
+        module = new WebAssembly.Module(module);
+    }
+
+    const instance = new WebAssembly.Instance(module, imports);
+
+    return __wbg_finalize_init(instance, module);
+}
+
+async function __wbg_init(input) {
+    if (wasm !== undefined) return wasm;
+
+    if (typeof input === 'undefined') {
+        input = new URL('web-78a67224672b0005_bg.wasm', import.meta.url);
+    }
+    const imports = __wbg_get_imports();
+
+    if (typeof input === 'string' || (typeof Request === 'function' && input instanceof Request) || (typeof URL === 'function' && input instanceof URL)) {
+        input = fetch(input);
+    }
+
+    __wbg_init_memory(imports);
+
+    const { instance, module } = await __wbg_load(await input, imports);
+
+    return __wbg_finalize_init(instance, module);
+}
+
+export { initSync }
+export default __wbg_init;
diff --git a/docs/web-78a67224672b0005_bg.wasm b/docs/web-78a67224672b0005_bg.wasm
new file mode 100644
index 0000000..a2de7df
Binary files /dev/null and b/docs/web-78a67224672b0005_bg.wasm differ
diff --git a/ordo/Cargo.lock b/ordo/Cargo.lock
new file mode 100644
index 0000000..c5085cb
--- /dev/null
+++ b/ordo/Cargo.lock
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diff --git a/ordo/Cargo.toml b/ordo/Cargo.toml
new file mode 100644
index 0000000..1135da5
--- /dev/null
+++ b/ordo/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "ordo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+itertools = "0.12.0"
+logos = "0.13.0"
+wasmi = "0.31.1"
+wat = "1.0.83"
diff --git a/src/core.rs b/ordo/src/core.rs
similarity index 100%
rename from src/core.rs
rename to ordo/src/core.rs
diff --git a/src/emit.rs b/ordo/src/emit.rs
similarity index 100%
rename from src/emit.rs
rename to ordo/src/emit.rs
diff --git a/ordo/src/env.rs b/ordo/src/env.rs
new file mode 100644
index 0000000..ff5860c
--- /dev/null
+++ b/ordo/src/env.rs
@@ -0,0 +1,73 @@
+use std::fmt;
+
+use crate::{
+    core::make_env,
+    eval, infer,
+    parser::{self, Parser},
+};
+
+#[derive(Debug)]
+pub enum Error {
+    Parser(parser::Error),
+    Infer(infer::Error),
+    Eval(eval::Error),
+}
+
+impl From<parser::Error> for Error {
+    fn from(value: parser::Error) -> Self {
+        Self::Parser(value)
+    }
+}
+
+impl From<infer::Error> for Error {
+    fn from(value: infer::Error) -> Self {
+        Self::Infer(value)
+    }
+}
+
+impl From<eval::Error> for Error {
+    fn from(value: eval::Error) -> Self {
+        Self::Eval(value)
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Error::Parser(p) => write!(f, "parser: {}", p),
+            Error::Infer(i) => write!(f, "infer: {}", i),
+            Error::Eval(e) => write!(f, "eval: {}", e),
+        }
+    }
+}
+
+type Result<T, E = Error> = std::result::Result<T, E>;
+
+pub struct Output {
+    pub ty: String,
+    pub val: String,
+}
+
+pub struct Env {
+    pub infer: infer::Env,
+    pub eval: eval::Env,
+}
+
+impl Default for Env {
+    fn default() -> Self {
+        let infer = make_env();
+        let eval = Default::default();
+        Self { infer, eval }
+    }
+}
+
+impl Env {
+    pub fn process(&mut self, source: &str) -> Result<Output> {
+        let expr = Parser::repl(source)?;
+        let typed_expr = self.infer.infer(expr.clone())?;
+        let value = self.eval.eval(&expr)?;
+        let ty = self.infer.ty_to_string(typed_expr.ty()).unwrap();
+        let val = value.to_string();
+        Ok(Output { ty, val })
+    }
+}
diff --git a/src/eval.rs b/ordo/src/eval.rs
similarity index 99%
rename from src/eval.rs
rename to ordo/src/eval.rs
index 299ae6a..d33f2d1 100644
--- a/src/eval.rs
+++ b/ordo/src/eval.rs
@@ -1,5 +1,5 @@
 use core::fmt;
-use std::collections::{BTreeMap, HashMap};
+use std::collections::BTreeMap;
 
 use itertools::Itertools;
 
@@ -160,7 +160,7 @@ impl Wrap {
 
 #[derive(Clone, Debug, Default, PartialEq)]
 pub struct Env {
-    vars: HashMap<String, Value>,
+    pub vars: BTreeMap<String, Value>,
 }
 
 impl Env {
diff --git a/src/expr.rs b/ordo/src/expr.rs
similarity index 100%
rename from src/expr.rs
rename to ordo/src/expr.rs
diff --git a/src/infer.rs b/ordo/src/infer.rs
similarity index 99%
rename from src/infer.rs
rename to ordo/src/infer.rs
index 90a385a..2be03bd 100644
--- a/src/infer.rs
+++ b/ordo/src/infer.rs
@@ -94,7 +94,7 @@ impl<K: std::cmp::Ord, V> BTreeMapExt<K, V> for BTreeMap<K, V> {
 
 #[derive(Clone, Default)]
 pub struct Env {
-    pub vars: HashMap<String, Type>,
+    pub vars: BTreeMap<String, Type>,
     pub type_vars: Vec<TypeVar>,
     wrap: BTreeMap<String, Type>,
 }
diff --git a/src/lexer.rs b/ordo/src/lexer.rs
similarity index 100%
rename from src/lexer.rs
rename to ordo/src/lexer.rs
diff --git a/ordo/src/lib.rs b/ordo/src/lib.rs
new file mode 100644
index 0000000..3ee6731
--- /dev/null
+++ b/ordo/src/lib.rs
@@ -0,0 +1,36 @@
+pub mod core;
+pub mod emit;
+pub mod env;
+pub mod eval;
+pub mod expr;
+pub mod infer;
+pub mod lexer;
+pub mod parser;
+
+#[cfg(test)]
+#[path = "tests/ifs.rs"]
+mod ifs;
+
+#[cfg(test)]
+#[path = "tests/unwraps.rs"]
+mod unwraps;
+
+#[cfg(test)]
+#[path = "tests/parse_only.rs"]
+mod parse_only;
+
+#[cfg(test)]
+#[path = "tests/parse_at.rs"]
+mod parse_at;
+
+#[cfg(test)]
+#[path = "tests/infer_tests.rs"]
+mod infer_tests;
+
+#[cfg(test)]
+#[path = "tests/typed_exprs.rs"]
+mod typed_exprs;
+
+#[cfg(test)]
+#[path = "tests/emit_tests.rs"]
+mod emit_tests;
diff --git a/src/parser.rs b/ordo/src/parser.rs
similarity index 100%
rename from src/parser.rs
rename to ordo/src/parser.rs
diff --git a/src/tests/emit_tests.rs b/ordo/src/tests/emit_tests.rs
similarity index 100%
rename from src/tests/emit_tests.rs
rename to ordo/src/tests/emit_tests.rs
diff --git a/src/tests/ifs.rs b/ordo/src/tests/ifs.rs
similarity index 100%
rename from src/tests/ifs.rs
rename to ordo/src/tests/ifs.rs
diff --git a/src/tests/infer_tests.rs b/ordo/src/tests/infer_tests.rs
similarity index 100%
rename from src/tests/infer_tests.rs
rename to ordo/src/tests/infer_tests.rs
diff --git a/src/tests/parse_at.rs b/ordo/src/tests/parse_at.rs
similarity index 100%
rename from src/tests/parse_at.rs
rename to ordo/src/tests/parse_at.rs
diff --git a/src/tests/parse_only.rs b/ordo/src/tests/parse_only.rs
similarity index 100%
rename from src/tests/parse_only.rs
rename to ordo/src/tests/parse_only.rs
diff --git a/src/tests/typed_exprs.rs b/ordo/src/tests/typed_exprs.rs
similarity index 100%
rename from src/tests/typed_exprs.rs
rename to ordo/src/tests/typed_exprs.rs
diff --git a/src/tests/unwraps.rs b/ordo/src/tests/unwraps.rs
similarity index 100%
rename from src/tests/unwraps.rs
rename to ordo/src/tests/unwraps.rs
diff --git a/web/Cargo.lock b/web/Cargo.lock
new file mode 100644
index 0000000..6047e1b
--- /dev/null
+++ b/web/Cargo.lock
@@ -0,0 +1,1363 @@
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+ "log",
+ "ordo",
+ "wasm-logger",
+ "web-sys",
+ "yew",
+]
+
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+ "futures",
+ "gloo 0.10.0",
+ "implicit-clone",
+ "indexmap",
+ "js-sys",
+ "prokio",
+ "rustversion",
+ "serde",
+ "slab",
+ "thiserror",
+ "tokio",
+ "tracing",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+ "yew-macro",
+]
+
+[[package]]
+name = "yew-macro"
+version = "0.21.0"
+source = "git+https://github.com/yewstack/yew/#f6b23f08284dec949efaf860fbe8e9198e3d0bed"
+dependencies = [
+ "once_cell",
+ "prettyplease",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+]
diff --git a/web/Cargo.toml b/web/Cargo.toml
new file mode 100644
index 0000000..372a35a
--- /dev/null
+++ b/web/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "web"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+log = "0.4.20"
+ordo = { path = "../ordo" }
+wasm-logger = "0.2.0"
+yew = { git = "https://github.com/yewstack/yew/", features = ["csr"] }
+
+[dependencies.web-sys]
+version = "0.3"
+features = [
+    "HtmlElement",
+    "HtmlInputElement",
+]
diff --git a/web/index.html b/web/index.html
new file mode 100644
index 0000000..6bd87a5
--- /dev/null
+++ b/web/index.html
@@ -0,0 +1,13 @@
+<html>
+    <head>
+        <meta charset="utf-8" />
+        <link href="https://fonts.cdnfonts.com/css/source-code-pro" rel="stylesheet">
+        <title>ordo</title>
+        <style>
+            body {
+                font-family: "Source Code Pro", sans-serif;
+            }
+        </style>
+    </head>
+    <body></body>
+</html>
diff --git a/web/src/main.rs b/web/src/main.rs
new file mode 100644
index 0000000..fb2cced
--- /dev/null
+++ b/web/src/main.rs
@@ -0,0 +1,140 @@
+use ordo::env::{Env, Error, Output};
+use web_sys::HtmlInputElement;
+use yew::prelude::*;
+
+const ENTER_KEY: u32 = 13;
+
+enum Message {
+    ProcessLine(String),
+}
+
+#[derive(Default)]
+struct App {
+    env: Env,
+    history: Vec<(String, Result<Output, Error>)>,
+}
+
+impl Component for App {
+    type Message = Message;
+
+    type Properties = ();
+
+    fn create(_ctx: &Context<Self>) -> Self {
+        Self::default()
+    }
+
+    fn update(&mut self, _ctx: &Context<Self>, msg: Self::Message) -> bool {
+        match msg {
+            Message::ProcessLine(source) => {
+                let res = self.env.process(&source);
+                self.history.push((source, res));
+                true
+            }
+        }
+    }
+
+    fn view(&self, ctx: &Context<Self>) -> Html {
+        let link = ctx.link().clone();
+        let onkeydown = move |e: KeyboardEvent| {
+            if e.key_code() == ENTER_KEY {
+                let input: HtmlInputElement = e.target_unchecked_into();
+                let line = input.value();
+                input.set_value("");
+                link.send_message(Message::ProcessLine(line))
+            }
+        };
+        html! {
+            <div style="display: flex; flex-direction: row; height: 90vh;">
+                <div style="flex: 2; display: flex; flex-direction: column">
+                    <fieldset style="flex: 9; overflow-y: scroll;">
+                        { render_legend("History") }
+                        { self.render_history() }
+                    </fieldset>
+                    <fieldset style="flex: 1;">
+                        { render_legend("Input") }
+                        <input type="text" placeholder="Type here" {onkeydown} style="border: 0; outline: 0; width: 100%; height: 100%; font-size: 2em;"/>
+                    </fieldset>
+                </div>
+                <fieldset style="flex: 1; overflow-y: scroll;">
+                    { render_legend("Environment") }
+                    { self.render_env() }
+                </fieldset>
+            </div>
+        }
+    }
+}
+
+impl App {
+    fn render_history(&self) -> Html {
+        let history = self
+            .history
+            .iter()
+            .map(|(line, res)| render_line(line, res));
+        html! {
+            <div>
+                { for history }
+            </div>
+        }
+    }
+
+    fn render_env(&self) -> Html {
+        let env = self
+            .env
+            .infer
+            .vars
+            .iter()
+            .filter_map(|(var, ty)| {
+                self.env.eval.vars.get(var).map(|val| {
+                    (
+                        var,
+                        self.env.infer.ty_to_string(ty).unwrap(),
+                        val.to_string(),
+                    )
+                })
+            })
+            .map(|(var, ty, val)| render_input(var, &ty, &val));
+        html! {
+            <div>
+                { for env }
+            </div>
+        }
+    }
+}
+
+fn render_input(input: &String, ty: &String, val: &String) -> Html {
+    html! {
+        <div style="display: flex; flex-direction: column;">
+            <div style="flex: 2; font-size: 1.5rem;">{input}</div>
+            <div style="flex: 1;">
+                <div style="float: left">{val}</div>
+                <div style="float: right">{ty}</div>
+            </div>
+        </div>
+    }
+}
+
+fn render_legend(title: &str) -> Html {
+    html! {
+        <legend><h2>{title}</h2></legend>
+    }
+}
+
+fn render_line(line: &String, res: &Result<Output, Error>) -> Html {
+    match res {
+        Ok(output) => render_input(line, &output.ty, &output.val),
+        Err(e) => {
+            let value = e.to_string();
+            html! {
+                <div style="display: flex; flex-direction: column;">
+                    <div style="flex: 2; font-size: 1.5rem;">{line}</div>
+                    <div style="flex: 1;">{value}</div>
+                </div>
+            }
+        }
+    }
+}
+
+fn main() {
+    wasm_logger::init(wasm_logger::Config::new(log::Level::Trace));
+    yew::Renderer::<App>::new().render();
+}