Quern

Building an agentic domain harness for mobile devices. Give your agent tools and context to effectively work with apps, dev, and test on iOS and Android devices

[Quern @querndev]

Well howdy! First time poster, long time caller.

I am a QA professional who has worked with mobile devices a long time. When Claude Code hit, I was excited until I realized that it could barely do anything with mobile devices apart from writing app code and installing the app.

[Quern @querndev]

@CarlosBBuild Claude Code + Quern for AI assisted testing and bug hunting

[Guillermo Rauch @rauchg]

Show me the thing you’ve built with AI you’re most proud of. Reply with a working product URL and what model / agent you primarily used.

[Quern @querndev]

@rauchg A Claude Code extension that gives your agent the ability to work with mobile devices /simulators / emulators during app development and test. No GUI, just a local API/MCP server that lets your agent use its whole 🧠 to control and reason about your app.
https://t.co/tXqpFeCmPu

[Quern @querndev]

@megallmio @RoundtableSpace The model isn’t running on the iMac

[Quern @querndev]

@thymikee Cheeky. You know more than one. 😎

[Quern @querndev]

@ell470 Speaking of which, did Quern help you during iOS development? Let me know if you have any feedback!

[Quern @querndev]

@birch_js @thymikee @bidah It’s true! Quern doesn’t have a UI at all - it is focused on agent usability. But it has all the ui control /logs /screenshots many others have, PLUS a full featured network proxy that is basically a headless, programmable, per-simulator proxyman.

[Quern @querndev]

@Kelset Quern is a must! Claude can now test on mobile, plus it has a full featured network proxy, great for testing network error handling.

https://t.co/tXqpFeCmPu

[Quern @querndev]

Quern version 0.13 just dropped this morning. We replaced our idb dependency (for iOS simulator control) with a home-rolled interface inspired by the folks over at baguette.

https://t.co/tXqpFeCmPu

[Quern @querndev]

@itshanrw Hey there! Just wanted to let you know that I integrated a couple things you were using in baguette. Also, discovered a solution to a problem you have, check out issue 17 I just filed on your GitHub repository. 😎 Thank you so much!

[Quern @querndev]

@optimalfocus @anamhira Quern uses local simulators and/ or real iPhones. If you develop anything that needs a real phone— Bluetooth accessories, NFC interactions, etc. you need real devices.

https://t.co/tXqpFeCmPu

[Quern @querndev]

@retrovesto @ssarisen That’s what I ended up doing. https://t.co/tXqpFeCmPu

[Quern @querndev]

@tom_doerr Nice!

[Quern @querndev]

@itshanrw Excellent!

[Quern @querndev]

@mylifcc @b_nnett A few players in this space! With Quern, you can do the prototyping and extensive testing, including network error handling with its per-simulator proxy.

https://t.co/tXqpFeCmPu

[Quern @querndev]

@natiakourdadze You might like Quern. It lets your agent (Claude or whatever) take care of building and installing your app, manage your simulators, look at logs, use the UI in realtime to complete tasks, and even write scripts for repeatable stuff you don’t want to burn tokens on…

[Quern @querndev]

@svpino But what about developers that have to use Xcode?

[Quern @querndev]

@mchulet @X If you love AI-driven mobile app dev, you will love Quern. It takes the hassle out of the high-friction things that make you leave your terminal. A thousand cuts of simulator management, log copypasta, proxy setup hell, screenshots, and ui automation.
https://t.co/D3qHej9B3x

[Quern @querndev]

@NextGenAi5 You forgot the ‘test’ step. Quern can help with that. It is built to help Claude understand how to work with simulators, devices, and your app, so you can build, run, and test your app by asking Claude to run test cases in plain English.
https://t.co/tXqpFeCmPu

[Quern @querndev]

@MainActorDev @urugothor @hxyden Okay, awesome, I will put something together! Really appreciate the feedback.