GitHubWhat they did
The developer behind Molfar, a free Android app for chatting with several AI models, works entirely from a phone. They open Claude Code from the Claude mobile app with a short task; Claude plans, writes code in a cloud session with no Android SDK or emulator, runs what checks it can and commits. Those checks are plain-Java test harnesses for the app's logic, each with a deliberate break it must catch, a compile of the UI against stubs, and a script that checks strings in all five languages. The person builds the APK on the phone in NanoIDE, tries the change and replies with a screenshot. GitHub Actions makes the signed build and the person uploads it to Google Play. Rules, lessons and handoffs between sessions live in CLAUDE.md.
How it went
The Kotlin rewrite started on 24 September 2026, Claude has worked in the repo since 15 October, and seven public releases went out between 25 October and 7 November. By 8 November the project had about 35,000 lines in 220 files. At least five bugs passed in the cloud but broke on phones, including a regex Android does not support, which took a day to find, and an Android 15 layout bug that users saw first. It was fixed the same day as release 2.0.7.
Worth knowing
With no emulator, real users are the first to see some layout and runtime failures, so each failure class got its own check or rule afterwards. Claude remembers nothing between sessions; whatever is not written in CLAUDE.md is lost, and even the test tools are rebuilt from the README each time. The write-up itself was drafted by AI from project notes and approved by the developer.