Solo Forge

Solo Forge is a free and open source Android fitness app: an intermittent fasting timer, calorie and macro counter, weight tracker, and workout timer in one. No ads, no tracking, fully offline.

It is built around local data ownership:

* No backend
* No accounts
* No analytics
* No crash reporting
* Android cloud backup disabled
* Full backup and restore to a single file, with optional auto-backup to a folder you choose

Features:

* Intermittent fasting timer with 12:12, 14:10, 16:8, 18:6, 20:4, and 36 hour modes
* State-driven fasting reminders instead of daily notification spam
* Food photo analysis using your own OpenRouter API key
* Manual meal entry and editable macro estimates
* Local calorie and macro goals
* Weight history with charting
* Simple, interval, and exercise/rest workout timers
* Dashboard for fasting, nutrition, weight, workout time, and streaks
* Daily journal notes on the progress calendar
* Optional Health Connect sync for weight, workouts and meals, so entries recorded by a scale, tracker or another food app do not need retyping

Solo Forge sends a network request only when you start food photo analysis. That request goes to OpenRouter using the API key you provide. All saved meals, weight entries, workouts, fasting history, settings, and exports remain local to your device.

Solo Forge is licensed under GPL-3.0.

Meals now sync with Health Connect. Turn on import to bring in meals logged by other food apps, export to share calories and macros you log here with your other health apps, or both; the existing switches in Settings cover it, and nothing leaves your phone. The open-weight AI model was retired by OpenRouter, so that option now uses DeepSeek V4.1 Flash, which measured more accurate in this project's tests.