Solo Forge
Private Fitness Companion
• Solo Forge is an all-in-one, free, and open-source Android application designed to help users manage their fitness journeys without compromising personal data.
• It consolidates fasting, nutrition, weight tracking, and workout timing into a single utility.
Data Privacy and Security
• Runs completely offline with no backend servers, user accounts, or cloud dependencies.
• Contains zero advertisements, third-party trackers, analytics, or automated crash reporting tools.
• Disables Android cloud backups to prevent unintentional data exposure to external servers.
• Facilitates local data ownership through manual, explicit CSV exports to user-selected storage folders.
Nutrition and Intermittent Fasting
• Supports intermittent fasting with predefined schedules, including 16:8, 18:6, 20:4, and 36-hour modes.
• Employs state-driven fasting reminders that react to user progress rather than sending daily notification spam.
• Provides a local database to track daily calorie budgets, macro targets, and manual meal entries with editable estimates.
• Features AI-assisted food photo analysis, which works by connecting directly to OpenRouter using a user-provided API key.
Fitness and Progress Tracking
• Logs body weight history and visualizes progress over time with built-in charting tools.
• Offers versatile workout timers configured for simple countdowns, custom intervals, or structured exercise-and-rest routines.
• Consolidates active fasts, nutrition targets, weight trends, workout history, and motivational streaks onto a centralized dashboard.
Technical Architecture
• Restricts network activity exclusively to food photo analysis requests sent directly to OpenRouter.
• Retains all saved meals, weight logs, workout histories, and app settings strictly on the local device.
• Distributed as free, open-source software licensed under the GNU General Public License v3.0.
FAQ
Q: How does Solo Forge protect my personal health data from being shared?
A: Privacy is the core focus of the application, which is why it operates entirely offline without the use of backend servers or user accounts. By forgoing cloud dependencies and third-party trackers, the app ensures that your sensitive health information never leaves your device or falls into the hands of advertisers.
Q: What types of intermittent fasting schedules are available for me to use?
A: The app supports a variety of popular fasting protocols to suit different lifestyles, including the 16:8, 18:6, and 20:4 methods, as well as more extended 36-hour fasts. You can easily select the schedule that fits your goals and track your progress through the dedicated fasting module.
Q: Will I be bothered by constant notifications while using the fasting tracker?
A: Solo Forge uses a smart, state-driven notification system that only sends alerts based on your actual progress rather than relying on a rigid daily schedule. This approach ensures that you receive meaningful updates when they matter, effectively preventing the notification fatigue often caused by "spammy" fitness apps.
Version History
v0.4.2——27 Jul 2026
Solo Forge: Private open-source Android app for intermittent fasting, nutrition & weight tracking. 100% offline fitness with zero ads. Download the latest version of Solo Forge to enjoy new features and updates immediately!
*0.4.2
Photo analysis now uses far less memory: pictures are scaled down as they are read rather than after, which should stop the food camera running out of memory on phones with big sensors. The analyzed photo sent for analysis is unchanged.
The first-run intro screen no longer sits under the status bar or the gesture handle, and the app no longer uses the deprecated edge-to-edge window APIs.
Note on the APK: GitHub releases are signed with the debug key, as they always have been. F-Droid and Google Play builds use different keys and are not cross-installable with this one.
*0.4.1
Settings now links to the Solo Forge privacy policy, so you can read it without leaving the app.
That policy — at soloforge.dimitroff.work/privacy — is now the single canonical version, and it spells out how to delete your data: per entry, all at once by uninstalling, exported backup files, and anything synced to Health Connect. PRIVACY.md in this repo is a pointer to it rather than a second copy that can drift.
No functional changes to the app.
The attached APK is debug-signed, as every GitHub release has been. It is not cross-installable with the F-Droid or Google Play builds — those use different keys. If you installed from GitHub before, this updates in place.
*0.4.0
Solo Forge now syncs with Health Connect, Android's on-device health store. Weight and workouts recorded by other apps (Gadgetbridge, openScale, and anything else that writes there) can flow into Solo Forge without retyping, and entries you create here can flow back out.
• Import and Export are separate switches in Settings, both off by default. Each asks only for the permissions it needs, and you can grant a subset — weight without workouts, or the reverse.
• First import pulls the last 30 days, then keeps up incrementally. Re-syncing never duplicates: records are matched on their Health Connect id, and anything Solo Forge itself wrote is skipped.
• Sync runs when you open the app, plus a "Sync now" row in Settings.
This stays local-first. Health Connect is on-device by definition — nothing leaves your phone, and the only outbound host remains openrouter.ai for opt-in food analysis.
Also in this release: the app now targets Android 16 (API 36), and backup files written by older versions import correctly again.
APK below is debug-signed, as all GitHub releases of Solo Forge have been — installing it over a Play or F-Droid build will not work.
