New in version 0.10.0
Fasts can now run up to 7 days: pick Custom and set any target from 1 hour to a week. A weekly strip shows the hours fasted each day, and streaks count every day a fast covers. A new, entirely optional body profile (height, age, sex, activity, goal weight) suggests daily calories and macros, shows your BMI with a healthy range, and draws your goal on the weight chart. Skip any field and defaults are used; nothing leaves your phone.
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.
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Versions
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.
Download F-Droid
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arm64-v8a
armeabi-v7a
x86
x86_64
This version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
-
view network connections
Allows the app to view information about network connections such as which networks exist and are connected.
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take pictures and videos
This app can take pictures and record videos using the camera while the app is in use.
-
run foreground service
Allows the app to make use of foreground services.
-
run foreground service with the type "specialUse"
Allows the app to make use of foreground services with the type "specialUse"
-
have full network access
Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
-
show notifications
Allows the app to show notifications
-
run at startup
Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
-
control vibration
Allows the app to control the vibrator.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
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android.permission.health.READ_EXERCISE
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android.permission.health.READ_NUTRITION
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android.permission.health.READ_WEIGHT
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android.permission.health.WRITE_EXERCISE
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android.permission.health.WRITE_NUTRITION
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android.permission.health.WRITE_WEIGHT
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com.kbul.spicycrab.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
3.2 MiB
PGP Signature
|
Build Log
New in version 0.9.0
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.
-
arm64-v8a
armeabi-v7a
x86
x86_64
This version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
-
view network connections
Allows the app to view information about network connections such as which networks exist and are connected.
-
take pictures and videos
This app can take pictures and record videos using the camera while the app is in use.
-
run foreground service
Allows the app to make use of foreground services.
-
run foreground service with the type "specialUse"
Allows the app to make use of foreground services with the type "specialUse"
-
have full network access
Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
-
show notifications
Allows the app to show notifications
-
run at startup
Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
-
control vibration
Allows the app to control the vibrator.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
-
android.permission.health.READ_EXERCISE
-
android.permission.health.READ_NUTRITION
-
android.permission.health.READ_WEIGHT
-
android.permission.health.WRITE_EXERCISE
-
android.permission.health.WRITE_NUTRITION
-
android.permission.health.WRITE_WEIGHT
-
com.kbul.spicycrab.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
3.1 MiB
PGP Signature
|
Build Log
New in version 0.8.0
Two gentler fasting modes, 12:12 and 14:10, join 16:8, 18:6, 20:4 and 36h. With six modes, every mode picker now wraps into a grid so none are hidden off-screen, and the selected mode is marked with a check. Changing the default mode in Settings now always reaches Home and the Fast tab, even after you have picked a mode by hand. Thanks to Malachi Soord (inverse) for both changes.
-
arm64-v8a
armeabi-v7a
x86
x86_64
This version requires Android 8.0 or newer.
It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
-
view network connections
Allows the app to view information about network connections such as which networks exist and are connected.
-
take pictures and videos
This app can take pictures and record videos using the camera while the app is in use.
-
run foreground service
Allows the app to make use of foreground services.
-
run foreground service with the type "specialUse"
Allows the app to make use of foreground services with the type "specialUse"
-
have full network access
Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
-
show notifications
Allows the app to show notifications
-
run at startup
Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
-
control vibration
Allows the app to control the vibrator.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
-
android.permission.health.READ_EXERCISE
-
android.permission.health.READ_WEIGHT
-
android.permission.health.WRITE_EXERCISE
-
android.permission.health.WRITE_WEIGHT
-
com.kbul.spicycrab.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
3.1 MiB
PGP Signature
|
Build Log
