diff --git a/MIGRATION.md b/MIGRATION.md
index 99c1b5fdffc3..5a281143b736 100644
--- a/MIGRATION.md
+++ b/MIGRATION.md
@@ -53,6 +53,7 @@
     - [Deprecated docs parameters](#deprecated-docs-parameters)
     - [Description Doc block properties](#description-doc-block-properties)
     - [Manager API expandAll and collapseAll methods](#manager-api-expandall-and-collapseall-methods)
+    - [`createChannel` from `@storybook/postmessage` and  `@storybook/channel-websocket`](#createchannel-from-storybookpostmessage-and--storybookchannel-websocket)
 - [From version 7.5.0 to 7.6.0](#from-version-750-to-760)
     - [CommonJS with Vite is deprecated](#commonjs-with-vite-is-deprecated)
     - [Using implicit actions during rendering is deprecated](#using-implicit-actions-during-rendering-is-deprecated)
@@ -877,6 +878,12 @@ api.collapseAll() // becomes api.emit(STORIES_COLLAPSE_ALL)
 api.expandAll() // becomes api.emit(STORIES_EXPAND_ALL)
 ```
 
+#### `createChannel` from `@storybook/postmessage` and  `@storybook/channel-websocket`
+
+The `createChannel` APIs from both `@storybook/channel-websocket` and `@storybook/postmessage` are now removed. Please use `createBrowserChannel` instead, from the `@storybook/channels` package.
+
+Additionally, the `PostmsgTransport` type is now removed in favor of `PostMessageTransport`.
+
 ## From version 7.5.0 to 7.6.0
 
 #### CommonJS with Vite is deprecated
diff --git a/code/lib/channels/src/index.ts b/code/lib/channels/src/index.ts
index a6c975752f13..7942d57fa4f3 100644
--- a/code/lib/channels/src/index.ts
+++ b/code/lib/channels/src/index.ts
@@ -13,8 +13,8 @@ export * from './main';
 
 export default Channel;
 
-export { createChannel as createPostMessageChannel, PostMessageTransport } from './postmessage';
-export { createChannel as createWebSocketChannel, WebsocketTransport } from './websocket';
+export { PostMessageTransport } from './postmessage';
+export { WebsocketTransport } from './websocket';
 
 type Options = Config & {
   extraTransports?: ChannelTransport[];
diff --git a/code/lib/channels/src/postmessage/index.ts b/code/lib/channels/src/postmessage/index.ts
index a49997fc3d32..e1c7332121b6 100644
--- a/code/lib/channels/src/postmessage/index.ts
+++ b/code/lib/channels/src/postmessage/index.ts
@@ -7,7 +7,6 @@ import { logger, pretty } from '@storybook/client-logger';
 import { isJSON, parse, stringify } from 'telejson';
 import qs from 'qs';
 import invariant from 'tiny-invariant';
-import { Channel } from '../main';
 import type {
   ChannelTransport,
   BufferedEvent,
@@ -243,25 +242,3 @@ export class PostMessageTransport implements ChannelTransport {
     }
   }
 }
-
-/**
- * @deprecated This export is deprecated. Use `PostMessageTransport` instead. This API will be removed in 8.0.
- */
-export const PostmsgTransport = PostMessageTransport;
-
-/**
- * @deprecated This function is deprecated. Use the `createBrowserChannel` factory function from `@storybook/channels` instead. This API will be removed in 8.0.
- * @param {Config} config - The configuration object.
- * @returns {Channel} The channel instance.
- */
-export function createChannel({ page }: Config): Channel {
-  const transport = new PostmsgTransport({ page });
-  return new Channel({ transport });
-}
-
-/**
- * @deprecated This function is deprecated. Use the `createBrowserChannel` factory function from `@storybook/channels` instead. This API will be removed in 8.0.
- * @param {Config} config - The configuration object.
- * @returns {Channel} The channel instance.
- */
-export default createChannel;
diff --git a/code/lib/channels/src/websocket/index.ts b/code/lib/channels/src/websocket/index.ts
index c07a96ffd71e..b4530de965c9 100644
--- a/code/lib/channels/src/websocket/index.ts
+++ b/code/lib/channels/src/websocket/index.ts
@@ -2,10 +2,9 @@
 /// <reference path="../typings.d.ts" />
 
 import { global } from '@storybook/global';
-import { logger } from '@storybook/client-logger';
 import { isJSON, parse, stringify } from 'telejson';
 import invariant from 'tiny-invariant';
-import { Channel } from '../main';
+
 import type { ChannelTransport, ChannelHandler } from '../types';
 
 const { WebSocket } = global;
@@ -17,12 +16,6 @@ interface WebsocketTransportArgs {
   onError: OnError;
 }
 
-interface CreateChannelArgs {
-  url?: string;
-  async?: boolean;
-  onError?: OnError;
-}
-
 export class WebsocketTransport implements ChannelTransport {
   private buffer: string[] = [];
 
@@ -77,30 +70,3 @@ export class WebsocketTransport implements ChannelTransport {
     buffer.forEach((event) => this.send(event));
   }
 }
-
-/**
- * @deprecated This function is deprecated. Use the `createBrowserChannel` factory function from `@storybook/channels` instead. This API will be removed in 8.0.
- * @param {CreateChannelArgs} options - The options for creating the channel.
- * @param {string} [options.url] - The URL of the WebSocket server to connect to.
- * @param {boolean} [options.async=false] - Whether the channel should be asynchronous.
- * @param {OnError} [options.onError] - A function to handle errors that occur during the channel's lifetime.
- * @returns {Channel} - The newly created channel.
- */
-export function createChannel({
-  url,
-  async = false,
-  onError = (err) => logger.warn(err),
-}: CreateChannelArgs) {
-  let channelUrl = url;
-  if (!channelUrl) {
-    const protocol = window.location.protocol === 'http:' ? 'ws' : 'wss';
-    const { hostname, port } = window.location;
-    channelUrl = `${protocol}://${hostname}:${port}/storybook-server-channel`;
-  }
-
-  const transport = new WebsocketTransport({ url: channelUrl, onError });
-  return new Channel({ transport, async });
-}
-
-// backwards compat with builder-vite
-export default createChannel;
diff --git a/code/ui/manager/src/globals/exports.ts b/code/ui/manager/src/globals/exports.ts
index 1da23ad426dc..b8e2d5b14868 100644
--- a/code/ui/manager/src/globals/exports.ts
+++ b/code/ui/manager/src/globals/exports.ts
@@ -127,8 +127,6 @@ export default {
     'PostMessageTransport',
     'WebsocketTransport',
     'createBrowserChannel',
-    'createPostMessageChannel',
-    'createWebSocketChannel',
   ],
   '@storybook/core-events': [
     'CHANNEL_CREATED',