AI agents are good at writing code. They’re bad at knowing whether it worked — especially on mobile devices. A build error gets caught automatically. But a silent API failure, a wrong screen, or a crash on launch usually doesn’t — unless you paste logs back into the chat yourself, and manually verify the UI. That’s the gap Quern is built to close. It’s a local debug server that gives AI coding agents structured, live access to what your iOS app is actually doing: device logs, network traffic, crash reports, screenshots, and the ability to interact with the running app in a simulator, emulator, or physical device. I’ve spent 12 years in mobile QA watching developers juggle Charles Proxy in one window, Console.app in another, and Xcode’s device manager in a third, manually correlating timestamps to figure out the root cause of an unintended outcome. Web developers have had Chrome DevTools the whole time, and the Playwright MCP. Mobile developers never got that coherent observability and control layer. Quern is my attempt to build it — designed from the start for AI agents, not bolted on after. Local-first, Apache 2.0. No signups. Just install it and start working. https://quern.dev/ #iOSDev #MobileQA #BuildInPublic #AIAgents #DeveloperTools submitted by /u/jerimiah797
Originally posted by u/jerimiah797 on r/ClaudeCode
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