Devlog: how we built the letsBug apps

How we built our Android apps: the real code, the design choices and the bugs we hit. Each post goes with a letsBug video.

1. Run Qwen2.5 on Android Offline with MediaPipe (Devlog): How we run Qwen2.5 on an Android phone to write birthday wishes in Hinglish or English: no account, no server, a kindness guard and two real bugs.
2. How to Calculate a Habit Streak with Rest Days (Kotlin): The streak algorithm in our Android habit tracker: the real Kotlin, worked examples with rest days and misses, the edge cases, and how we test it.
3. Sholo Guti Game for Android: Porting a Web Game to Kotlin: How we built Battisi, a Sholo Guti game for Android, from our web version: a pure Kotlin engine, the Guru AI, same Wi-Fi play and a phone-only crash.

More subjects: Maths · Physics · Chemistry · Biology · Geography · Code · Builds. And how we check facts.