/AI3d ago

OpenAI releases Codex iOS app plugin with integrated simulator and hot-reloading SwiftUI previews

iOS developer Oskar Groth says the tool directly challenges Xcode

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Original postjason#931

More of the iOS app loop, now inside Codex.

The Build iOS Apps plugin lets Codex view and test your iOS app in the in-app browser, open SwiftUI previews, and hot reload edits without leaving Codex.

11:16 AM · Jun 4, 2026 · 1.7M Views
Sentiment

Positive users praise OpenAI Codex's new SwiftUI previews and hot reload plugin for turning it into a full iOS IDE, while negative users call the feature underwhelming and the updates slow.

Pos
71.4%
Neg
28.6%
87 comments with sentiment.
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VIEWS10.4KREPLIES5
Oskar Groth@oskargroth

Apple is going to have a tough job next week convincing developers that Xcode is still relevant.

More of the iOS app loop, now inside Codex.

The Build iOS Apps plugin lets Codex view and test your iOS app in the in-app browser, open SwiftUI previews, and hot reload edits without leaving Codex.

3dViews 10.4KLikes 62Bookmarks 17
BOOKMARKS42LIKES111

Shoutout to the open source projects behind this:

• Serve-sim powers the streaming simulator by @Baconbrix https://github.com/EvanBacon/serve-sim

• SnapshotPreviews extracts SwiftUI previews by @sentry https://github.com/getsentry/SnapshotPreviews

3dViews 7.2KLikes 111Bookmarks 42
RETWEETS602

More of the iOS app loop, now inside Codex.

The Build iOS Apps plugin lets Codex view and test your iOS app in the in-app browser, open SwiftUI previews, and hot reload edits without leaving Codex.

3dViews 1.7MLikes 8.4KBookmarks 5.1K
Nick Dobos@NickADobos

Dropping this right before WWDC is hilarious

I can’t tell if this means Apple will be amazing and build upon it, or if it will be a disappointment in comparison

More of the iOS app loop, now inside Codex.

The Build iOS Apps plugin lets Codex view and test your iOS app in the in-app browser, open SwiftUI previews, and hot reload edits without leaving Codex.

2dViews 9.3KLikes 59Bookmarks 16
Lex Tang@lexrus

@OpenAIDevs I think this one is better: https://github.com/tddworks/baguette

3dViews 794Likes 3Bookmarks 5
Leon Lin@LexnLin

@OpenAIDevs bro cmon where iss ittt

3dViews 617Likes 13
namvox@vhnam7

@OpenAIDevs @fatbobman hi @OpenAIDevs there is a device pool management lib, hope the team could interate it to Build iOS app plugin

https://github.com/namvox/simx

3dViews 431Likes 1Bookmarks 2
Florin Matincă@florinmatinca

@OpenAIDevs It’s also possible to access them remotely https://github.com/simcast-dev/simcast

3dViews 800Bookmarks 2
BOB CHEN@Bobchenjingbo

@OpenAIDevs coding agents going mobile is a bigger deal than it looks. the "i had an idea on the train and shipped it before my stop" loop is real. the bottleneck was never the keyboard — it was the gap between idea and running code.

3dViews 1.4KLikes 1Bookmarks 1
🥔🥔🥔@argofowl

@LexnLin @OpenAIDevs imma crash out in about 10 min

3dViews 110Likes 6
Techificial.ai@techificial

This is one of those updates that doesn't look like a big deal at first until you realize how much frustration it removes. Developers used to switch between their editor, simulator, browser, and debugging tools to test a small change. Now AI can write the code, show the app, test it, spot problems, and fix them. Every step and workflow that disappears saves a little time. We're seeing app development go from a pile of different tools to simply having a conversation.

3dViews 295Likes 4Bookmarks 1

@OpenAIDevs @aToy0m0 I built a small CLI for preparing a GitHub repo before applying for Codex for Open Source.

It checks whether the repo is ready as an OSS project: README, LICENSE, SECURITY.md, CI, and more.

It also generates a starter application draft.

https://github.com/ritsuki36/oss-maintainer-kit

3dViews 292Likes 1Bookmarks 1
🥔🥔🥔@argofowl

@OpenAIDevs cool

😬😬😬

3dViews 238Likes 4
itshan@itshanrw

@arkuy99 @OpenAIDevs 是的,这一个。非常好用 https://github.com/tddworks/baguette

3dViews 10Bookmarks 1
Owen Carey@owenthcarey

@OpenAIDevs SimDeck is another great option for viewing and testing your mobile app in Codex.

You can use it for other cool things too, like using GitHub Actions workflows to stream your app to the browser based on PR comments.

3dViews 510Bookmarks 1
Bastian Kusserow@BastianKusserow

@OpenAIDevs This is great news, however the preview part and hot reload only seem to work for non tuilst projects :( Is this planned to be supported? cc @Dimillian maybe you can chime in here? :)

2dViews 410Bookmarks 1
Haroon@haroonsulahri

@OpenAIDevs Ahh cool! Is it also available for Android and windows 🤔

3dViews 932Likes 3
Noah@noahlin34

@OpenAIDevs THATS IT?

3dViews 247Likes 4
Evan Bacon 🥓@Baconbrix

@OpenAIDevs @sentry Shoutout to the codex in-app browser team 🤘

3dViews 245Likes 4
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