diff --git a/Authorization/Authorization/Presentation/Login/SignInViewModel.swift b/Authorization/Authorization/Presentation/Login/SignInViewModel.swift
index c97689735..2473d127d 100644
--- a/Authorization/Authorization/Presentation/Login/SignInViewModel.swift
+++ b/Authorization/Authorization/Presentation/Login/SignInViewModel.swift
@@ -50,12 +50,12 @@ public class SignInViewModel: ObservableObject {
     
     @MainActor
     func login(username: String, password: String) async {
-        guard validator.isValidEmail(username) else {
-            errorMessage = AuthLocalization.Error.invalidEmailAddress
+        guard validator.isValidUsernameOrEmail(username) else {
+            errorMessage = AuthLocalization.Error.invalidEmailAddressOrUsername
             return
         }
         guard validator.isValidPassword(password) else {
-            errorMessage = AuthLocalization.Error.invalidPasswordLenght
+            errorMessage = AuthLocalization.Error.invalidPasswordLength
             return
         }
         
diff --git a/Authorization/Authorization/SwiftGen/Strings.swift b/Authorization/Authorization/SwiftGen/Strings.swift
index 9d7d92b4e..8db3e2bce 100644
--- a/Authorization/Authorization/SwiftGen/Strings.swift
+++ b/Authorization/Authorization/SwiftGen/Strings.swift
@@ -11,10 +11,12 @@ import Foundation
 // swiftlint:disable nesting type_body_length type_name vertical_whitespace_opening_braces
 public enum AuthLocalization {
   public enum Error {
-    /// Invalid email address
-    public static let invalidEmailAddress = AuthLocalization.tr("Localizable", "ERROR.INVALID_EMAIL_ADDRESS", fallback: "Invalid email address")
+    /// Invalid email
+    public static let invalidEmailAddress = AuthLocalization.tr("Localizable", "ERROR.INVALID_EMAIL_ADDRESS", fallback: "Invalid email")
+    /// Invalid email or username
+    public static let invalidEmailAddressOrUsername = AuthLocalization.tr("Localizable", "ERROR.INVALID_EMAIL_ADDRESS_OR_USERNAME", fallback: "Invalid email or username")
     /// Invalid password lenght
-    public static let invalidPasswordLenght = AuthLocalization.tr("Localizable", "ERROR.INVALID_PASSWORD_LENGHT", fallback: "Invalid password lenght")
+    public static let invalidPasswordLength = AuthLocalization.tr("Localizable", "ERROR.INVALID_PASSWORD_LENGTH", fallback: "Invalid password lenght")
   }
   public enum Forgot {
     /// We have sent a password recover instructions to your email 
@@ -31,6 +33,8 @@ public enum AuthLocalization {
   public enum SignIn {
     /// Email
     public static let email = AuthLocalization.tr("Localizable", "SIGN_IN.EMAIL", fallback: "Email")
+    /// Email or username
+    public static let emailOrUsername = AuthLocalization.tr("Localizable", "SIGN_IN.EMAIL_OR_USERNAME", fallback: "Email or username")
     /// Forgot password?
     public static let forgotPassBtn = AuthLocalization.tr("Localizable", "SIGN_IN.FORGOT_PASS_BTN", fallback: "Forgot password?")
     /// Sign in
diff --git a/Authorization/Authorization/en.lproj/Localizable.strings b/Authorization/Authorization/en.lproj/Localizable.strings
index 88365042c..beb312f81 100644
--- a/Authorization/Authorization/en.lproj/Localizable.strings
+++ b/Authorization/Authorization/en.lproj/Localizable.strings
@@ -9,14 +9,15 @@
 "SIGN_IN.LOG_IN_TITLE" = "Sign in";
 "SIGN_IN.WELCOME_BACK" = "Welcome back! Please authorize to continue.";
 "SIGN_IN.EMAIL" = "Email";
+"SIGN_IN.EMAIL_OR_USERNAME" = "Email or username";
 "SIGN_IN.PASSWORD" = "Password";
 "SIGN_IN.REGISTER_BTN" = "Register";
 "SIGN_IN.FORGOT_PASS_BTN" = "Forgot password?";
 "SIGN_IN.LOG_IN_BTN" = "Sign in";
 
-
-"ERROR.INVALID_EMAIL_ADDRESS" = "Invalid email address";
-"ERROR.INVALID_PASSWORD_LENGHT" = "Invalid password lenght";
+"ERROR.INVALID_EMAIL_ADDRESS" = "Invalid email";
+"ERROR.INVALID_EMAIL_ADDRESS_OR_USERNAME" = "Invalid email or username";
+"ERROR.INVALID_PASSWORD_LENGTH" = "Invalid password lenght";
 
 "SIGN_UP.TITLE" = "Sign up";
 "SIGN_UP.SUBTITLE" = "Create new account.";
diff --git a/Core/Core/View/Validator.swift b/Core/Core/View/Validator.swift
index f44913db2..382a57633 100644
--- a/Core/Core/View/Validator.swift
+++ b/Core/Core/View/Validator.swift
@@ -9,6 +9,11 @@ import Foundation
 
 public class Validator {
     
+    private let usernameOrEmailRegex = "^([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.com|[a-zA-Z0-9._%+-]+)$"
+    private lazy var usernameOrEmailPredicate = {
+        NSPredicate(format: "SELF MATCHES %@", usernameOrEmailRegex)
+    }()
+    
     private let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
     private lazy var emailPredicate = {
         NSPredicate(format: "SELF MATCHES %@", emailRegEx)
@@ -17,16 +22,15 @@ public class Validator {
     public init() {
     }
     
-    public func isValidEmail(_ email: String) -> Bool {
-        return emailPredicate.evaluate(with: email)
+    public func isValidUsernameOrEmail(_ string: String) -> Bool {
+        return usernameOrEmailPredicate.evaluate(with: string)
     }
     
-    public func isValidPassword(_ password: String) -> Bool {
-        return password.count >= 2
+    public func isValidEmail(_ string: String) -> Bool {
+        return emailPredicate.evaluate(with: string)
     }
     
-    public func isValidUsername(_ username: String) -> Bool {
-        return username.count >= 2 && username.count <= 30
+    public func isValidPassword(_ password: String) -> Bool {
+        return password.count >= 2
     }
-    
 }