diff --git a/src/Api/ApigeeX/Controller/AppByOwnerController.php b/src/Api/ApigeeX/Controller/AppByOwnerController.php
new file mode 100644
index 00000000..55a2f7fc
--- /dev/null
+++ b/src/Api/ApigeeX/Controller/AppByOwnerController.php
@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace Apigee\Edge\Api\ApigeeX\Controller;
+
+use Apigee\Edge\Api\Management\Controller\AttributesAwareEntityControllerTrait;
+use Apigee\Edge\Api\Management\Serializer\AppEntitySerializer;
+use Apigee\Edge\ClientInterface;
+use Apigee\Edge\Controller\EntityCrudOperationsControllerTrait;
+use Apigee\Edge\Controller\EntityListingControllerTrait;
+use Apigee\Edge\Controller\StatusAwareEntityControllerTrait;
+use Apigee\Edge\Serializer\EntitySerializerInterface;
+
+/**
+ * Common parent class for appgroup and developer app controllers.
+ */
+abstract class AppByOwnerController extends PaginatedEntityController implements AppByOwnerControllerInterface
+{
+    use AttributesAwareEntityControllerTrait;
+    use EntityCrudOperationsControllerTrait;
+    use EntityListingControllerTrait;
+    use PaginatedEntityListingControllerTrait;
+    use PaginationHelperTrait;
+    use StatusAwareEntityControllerTrait;
+
+    /**
+     * AppByOwnerController constructor.
+     *
+     * @param string $organization
+     * @param ClientInterface $client
+     * @param EntitySerializerInterface|null $entitySerializer
+     */
+    public function __construct(string $organization, ClientInterface $client, EntitySerializerInterface $entitySerializer = null)
+    {
+        $entitySerializer = $entitySerializer ?? new AppEntitySerializer();
+        parent::__construct($organization, $client, $entitySerializer);
+    }
+}
diff --git a/src/Api/ApigeeX/Controller/AppByOwnerControllerInterface.php b/src/Api/ApigeeX/Controller/AppByOwnerControllerInterface.php
new file mode 100644
index 00000000..b6c4d27c
--- /dev/null
+++ b/src/Api/ApigeeX/Controller/AppByOwnerControllerInterface.php
@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace Apigee\Edge\Api\ApigeeX\Controller;
+
+use Apigee\Edge\Api\Management\Controller\AttributesAwareEntityControllerInterface;
+use Apigee\Edge\Controller\EntityControllerInterface;
+use Apigee\Edge\Controller\EntityCrudOperationsControllerInterface;
+use Apigee\Edge\Controller\StatusAwareEntityControllerInterface;
+
+/**
+ * Describes common operations for appgroup and developer apps.
+ */
+interface AppByOwnerControllerInterface extends
+    AttributesAwareEntityControllerInterface,
+    EntityControllerInterface,
+    EntityCrudOperationsControllerInterface,
+    StatusAwareEntityControllerInterface
+{
+    /**
+     * Returns a list of entities from Apigee Edge.
+     *
+     * It only returns maximum 100 entities in case of developer- and appgroup
+     * apps. Check the related API documentation for more information.
+     * Use implementation of the AppControllerInterface to load _all_ apps
+     * from Apigee Edge.
+     *
+     * @return \Apigee\Edge\Entity\EntityInterface[]
+     */
+    public function getEntities(): array;
+}
diff --git a/src/Api/ApigeeX/Controller/AppGroupAppController.php b/src/Api/ApigeeX/Controller/AppGroupAppController.php
index c8b3b29c..f7c18fc9 100644
--- a/src/Api/ApigeeX/Controller/AppGroupAppController.php
+++ b/src/Api/ApigeeX/Controller/AppGroupAppController.php
@@ -20,12 +20,11 @@
 
 use Apigee\Edge\Api\ApigeeX\Entity\AppGroupApp;
 use Apigee\Edge\Api\ApigeeX\Serializer\AppGroupEntitySerializer;
-use Apigee\Edge\Api\Management\Controller\AppByOwnerController;
+use Apigee\Edge\Api\ApigeeX\Structure\PagerInterface;
 use Apigee\Edge\Api\Management\Controller\OrganizationController;
 use Apigee\Edge\Api\Management\Controller\OrganizationControllerInterface;
 use Apigee\Edge\ClientInterface;
 use Apigee\Edge\Serializer\EntitySerializerInterface;
-use Apigee\Edge\Structure\PagerInterface;
 use Psr\Http\Message\UriInterface;
 
 /**
@@ -53,8 +52,8 @@ public function __construct(
         string $organization,
         string $appGroup,
         ClientInterface $client,
-        ?EntitySerializerInterface $entitySerializer = null,
-        ?OrganizationControllerInterface $organizationController = null
+        EntitySerializerInterface $entitySerializer = null,
+        OrganizationControllerInterface $organizationController = null
     ) {
         $this->appGroup = $appGroup;
         $entitySerializer = $entitySerializer ?? new AppGroupEntitySerializer();
@@ -62,26 +61,6 @@ public function __construct(
         parent::__construct($organization, $client, $entitySerializer);
     }
 
-    /**
-     * Override the getEntities() method, for AppGroup compatibility.
-     *
-     * AppGroup does not support the "expand=false" query parameter.
-     *
-     * {@inheritdoc}
-     *
-     * @return \Apigee\Edge\Entity\EntityInterface[]
-     */
-    public function getEntities(): array
-    {
-        $uri = $this->getBaseEndpointUri();
-        $response = $this->getClient()->get($uri);
-        $responseArray = $this->responseToArray($response);
-        // Ignore entity type key from response, ex.: apiProduct.
-        $responseArray = reset($responseArray);
-
-        return $this->responseArrayToArrayOfEntities($responseArray);
-    }
-
     /**
      * Override the getEntityIds() method, for AppGroup compatibility.
      *
diff --git a/src/Api/ApigeeX/Controller/AppGroupAppControllerInterface.php b/src/Api/ApigeeX/Controller/AppGroupAppControllerInterface.php
index 20a12164..20d2bac0 100644
--- a/src/Api/ApigeeX/Controller/AppGroupAppControllerInterface.php
+++ b/src/Api/ApigeeX/Controller/AppGroupAppControllerInterface.php
@@ -18,12 +18,10 @@
 
 namespace Apigee\Edge\Api\ApigeeX\Controller;
 
-use Apigee\Edge\Api\Management\Controller\AppByOwnerControllerInterface;
-
 /**
  * Interface AppGroupAppControllerInterface.
  *
- * @see https://apidocs.apigee.com/api/apps-appgroup
+ * @see https://cloud.google.com/apigee/docs/reference/apis/apigee/rest/v1/organizations.appgroups.apps
  */
 interface AppGroupAppControllerInterface extends AppByOwnerControllerInterface, AppGroupAwareControllerInterface
 {
diff --git a/tests/offline-test-data/v1/organizations/phpunit/appgroups/phpunit/apps/GET_pageToken=4phpunit_test_app.json b/tests/offline-test-data/v1/organizations/phpunit/appgroups/phpunit/apps/GET_pageToken=4phpunit_test_app.json
new file mode 100644
index 00000000..b29c7b36
--- /dev/null
+++ b/tests/offline-test-data/v1/organizations/phpunit/appgroups/phpunit/apps/GET_pageToken=4phpunit_test_app.json
@@ -0,0 +1,84 @@
+{
+    "app": [
+        {
+            "appFamily": "default",
+            "appId": "b3e71cbb-7eb5-4444-b384-ac82bca1d9dc",
+            "attributes": [
+                {
+                    "name": "DisplayName",
+                    "value": "PHP Unit: Test app"
+                },
+                {
+                    "name": "Notes",
+                    "value": "This is a test app created by PHP Unit."
+                },
+                {
+                    "name": "foo",
+                    "value": "foo"
+                },
+                {
+                    "name": "bar",
+                    "value": "baz"
+                }
+            ],
+            "callbackUrl": "http://example.com",
+            "createdAt": 648345600000,
+            "createdBy": "phpunit@example.com",
+            "credentials": [
+                {
+                    "apiProducts": [],
+                    "attributes": [],
+                    "consumerKey": "wAXAIiOr2oJOVGqFltnm3Jwr2LE0GEuY",
+                    "consumerSecret": "S8YjnsjmdBqDAegR",
+                    "issuedAt": 648345600000,
+                    "scopes": [],
+                    "status": "approved"
+                }
+            ],
+            "appGroup": "phpunit",
+            "lastModifiedAt": 648345600000,
+            "lastModifiedBy": "phpunit@example.com",
+            "name": "4phpunit_test_app",
+            "scopes": [],
+            "status": "approved"
+        },
+        {
+            "appFamily": "default",
+            "appId": "b3e71cbb-7eb5-3333-b384-ac82bca1d9dc",
+            "attributes": [
+                {
+                    "name": "DisplayName",
+                    "value": "PHP Unit: Test app"
+                },
+                {
+                    "name": "Notes",
+                    "value": "This is a test app created by PHP Unit."
+                },
+                {
+                    "name": "foo",
+                    "value": "bar"
+                }
+            ],
+            "callbackUrl": "http://example.com",
+            "createdAt": 648345600000,
+            "createdBy": "phpunit@example.com",
+            "credentials": [
+                {
+                    "apiProducts": [],
+                    "attributes": [],
+                    "consumerKey": "wAXAIiOr2oJOVGqFltnm3Jwr2LE0GEuY",
+                    "consumerSecret": "S8YjnsjmdBqDAegR",
+                    "issuedAt": 648345600000,
+                    "scopes": [],
+                    "status": "approved"
+                }
+            ],
+            "appGroup": "phpunit",
+            "lastModifiedAt": 648345600000,
+            "lastModifiedBy": "phpunit@example.com",
+            "name": "5phpunit_test_app",
+            "scopes": [],
+            "status": "approved"
+        }
+    ]
+}
diff --git a/tests/offline-test-data/v1/organizations/phpunit/appgroups/phpunit/apps/GET_pageToken=5phpunit_test_app.json b/tests/offline-test-data/v1/organizations/phpunit/appgroups/phpunit/apps/GET_pageToken=5phpunit_test_app.json
new file mode 100644
index 00000000..2b6031ce
--- /dev/null
+++ b/tests/offline-test-data/v1/organizations/phpunit/appgroups/phpunit/apps/GET_pageToken=5phpunit_test_app.json
@@ -0,0 +1,42 @@
+{
+    "app": [
+        {
+            "appFamily": "default",
+            "appId": "b3e71cbb-7eb5-3333-b384-ac82bca1d9dc",
+            "attributes": [
+                {
+                    "name": "DisplayName",
+                    "value": "PHP Unit: Test app"
+                },
+                {
+                    "name": "Notes",
+                    "value": "This is a test app created by PHP Unit."
+                },
+                {
+                    "name": "foo",
+                    "value": "bar"
+                }
+            ],
+            "callbackUrl": "http://example.com",
+            "createdAt": 648345600000,
+            "createdBy": "phpunit@example.com",
+            "credentials": [
+                {
+                    "apiProducts": [],
+                    "attributes": [],
+                    "consumerKey": "wAXAIiOr2oJOVGqFltnm3Jwr2LE0GEuY",
+                    "consumerSecret": "S8YjnsjmdBqDAegR",
+                    "issuedAt": 648345600000,
+                    "scopes": [],
+                    "status": "approved"
+                }
+            ],
+            "appGroup": "phpunit",
+            "lastModifiedAt": 648345600000,
+            "lastModifiedBy": "phpunit@example.com",
+            "name": "5phpunit_test_app",
+            "scopes": [],
+            "status": "approved"
+        }
+    ]
+}