Bitrig lets you create native Swift apps for your phone, on your phone, just by chatting with AI. It’s like Lovable for iPhone apps.
Here's a video of Bitrig in action: https://youtu.be/CUlWhF3ERME
We created SwiftUI at Apple to help developers make better apps with less code. Bitrig lets anyone build at this level of polish. If you've thought about making an iPhone app, Bitrig is the easiest possible way to get started with Swift.
Bitrig uses Claude Sonnet 4.0 with a simple system prompt and tool definitions to generate native Swift code. Normally running this on an iPhone would require compiling and signing it with Xcode, and you can’t run Xcode on an iPhone. So we did something… creative. We wrote a custom Swift interpreter! Among other things this lets you instantly preview your app in Bitrig and share it with just a URL.
If you have a paid Apple developer account, you can connect it with Bitrig. We’ll compile your app on our server and upload it to App Store Connect, so you can distribute it on TestFlight or the App Store. This last step also gives you a fully optimized build of your app that you can install right on your Home Screen.
We think there’s something electric about building apps directly on your phone. We hope you give Bitrig a try!
We’re ingesting Apple’s SDK frameworks into Bitrig piece by piece. If you try to build something and hit a missing framework, let us know and we’ll prioritize adding it.
Download Bitrig on the App Store: https://apps.apple.com/us/app/bitrig/id6747835910
-Chris
Also, I have been taking the code and advice from Bitrig into Cursor, because it solves problems Cursor struggles with no matter what model it calls.
Your work is empowering, but more than that, it is inspiring, because I can now start to envisage what computer human interaction will look like in the near future.
You have taken away a layer of complexity to creation and that is to be applauded. I think your work is a landmark. I think Bitrig will unleash a new era of creative expression. I wish that I was part of your team.
https://play.google.com/store/apps/details?id=com.tyron.code
And well, the app the post is about, for iOS.
For the most part, I think the look and feel of the apps benefits from SwiftUI baking Apple's design system into the defaults so heavily.
Really cool product, as someone currently attempting to build a somewhat similar internal tool I have an understanding of some of the pain points involved.
Please don't allow yourselves to be bought out by Apple in the way Buddy Build were back in 2018 though! (and then shut down)
I don’t pipe up very often, but I visit HN almost every day. Many of the books I read, blogs I frequent, and podcasts I listen to, I found via HN. I think it’s fair to say, if it weren’t for HN, that Bitrig wouldn’t be Bitrig and SwiftUI wouldn’t be SwiftUI.
- How to Win Friends and Influence People — This was really eye opening to me and helped me more productively engage in a large organization like Apple.
- Sam Harris's podcast — I'm always interested to hear his takes on the controversial topics of the day as well as more philosophical and philanthropic ones.
- The Knowledge Project podcast — I don't listen to this as much anymore but a few years ago I was a regular listener.
- Simon Willison’s blog — The highest signal to noise way I've found to stay up to date with developments in AI.
And I echo the thanks. HN has made me a better technical professional in so many ways.
I've been working on a project and sometimes when I'm away from my laptop I have ideas I want to try in SwiftUI but only have my phone on me. What I end up doing is just writing my idea in text and then waiting till I'm back at my desk to give it a shot. Being able to spin up a quick prototype and preview it on the go could be cool.
I don't think my dog would enjoy me lugging my laptop on our walks but my phone is no big deal ;).
You can export your entire project as a single swift file from the share sheet. This makes it pretty straightforward to import the code into an Xcode project when you’re back at your Mac
With your sunscreen example, I should be able to just ask Siri to do exactly this, and it could tap me in my pocket, show me a custom UI to log periodically and then disappear.
Not sure on limitations of APIs on iOS but definitely feels like there is space for a better voice assistant, just like how Raycast have created a better Spotlight on Mac.
Looks very cool so far!
Our background is more in making developer tools, so bitrig was the first product we were excited about, but I think there's a lot of overlap with dynamic UI generation, and we'd love to explore that too.