Your personal gym coach, fully offline.
Personal training app for iPhone and Android, built with Flutter. Answer three questions and it builds you a weekly gym plan the way a coach would, then walks you through every session set by set and tracks how strong you are getting.
Everything runs offline. There is no account, no backend, and no analytics. The
release build ships without the INTERNET permission, so the app cannot send
your data anywhere even if it wanted to.
Sweatline is free and open source under the MIT license: no ads, no subscriptions, and nothing locked behind a paywall.
On Android, download the APK from the latest release.
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| Today | Plan | Library | Progress | Exercise detail |
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| Instructions | Warmup | Set logging | Rest timer | Summary |
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| Settings |
- Built-in trainer: a three-question quiz (goal, experience, frequency) generates a plan from proven splits: full body, push/pull/legs, upper/lower, or PPL twice for 6 days a week.
- Real programming: compound lifts first with warm-up sets, heavier loads, and longer rests; isolation work with higher reps; holds like the plank prescribed in seconds; rep ranges and rest periods tuned per goal; cardio prescribed for the goals that need it. Double progression asks for one more rep, then more weight, and backs the weight off when a lift stalls three sessions in a row.
- Guided workouts: one exercise at a time, target weight from your last session, set logging, and a wall-clock rest timer with a haptic buzz. Barbell lifts show which plates to put on each side of the bar. The screen stays awake, and an in-progress workout survives an app kill (auto-saved draft with resume).
- Personal records: beat your best weight, or match it for an extra rep, and the set gets a trophy, live during the workout and again on the summary. Every exercise shows its all-time best.
- Make the plan yours: swap any move for a similar one (just for today mid-workout, or saved to the plan), reorder a day's exercises by dragging, and edit sets, rep range, and rest per exercise. Keep a personal note per exercise (seat setting, grip) that shows up mid-workout.
- Exercise encyclopedia: 63 exercises with equipment, animated
movement pictograms (a figure tweening between start and end position,
drawn in code from pose data in
lib/exercise_poses.dart), muscle maps (front/back diagrams with primary and secondary muscles highlighted), step-by-step instructions, and trainer form cues. - Progress tracking: weekly and total stats, a weeks-in-a-row streak, per-exercise strength trends, body-weight tracking with a trend line, and full session history with the option to delete a mislogged workout.
- Share it: send the workout summary as an image to any app from the platform share sheet.
- Daily reminder: an optional local notification at your chosen time. Scheduled entirely on the device, like everything else.
- Settings: kg/lb display units (storage is always kg), light/dark/system theme, and backup as a shareable file or via the clipboard.
flutter pub get
flutter gen-l10n # generates lib/l10n/app_localizations*.dart
flutter runQuality gates (all must pass, CI enforces them):
dart format lib test
flutter analyze
flutter test --exclude-tags goldenBoth images are rendered by golden tests, then fanned out to the native platform sizes:
flutter test --update-goldens --tags golden test/tools/app_icon_test.dart
dart run flutter_launcher_icons
flutter test --update-goldens --tags golden test/tools/splash_logo_test.dart
dart run flutter_native_splash:createBump version: in pubspec.yaml first. The build number after the + has to
increase on every upload, or the stores reject the artifact.
make android-bundle # build/app/outputs/bundle/release/app-release.aab
make ios-bundle # build/ios/ipa/Android release builds need a local android/key.properties. Copy
android/key.properties.example, fill in the keystore values, and keep the
real file out of git. A Gradle task refuses to build a release without it,
rather than quietly producing a debug-signed artifact.
iOS targets iPhone only and is locked to portrait.
ios/Runner/PrivacyInfo.xcprivacy declares no tracking and no data
collection, which is what the App Store privacy label reports.
Single local store (lib/store.dart, a ChangeNotifier over SQLite via
lib/database.dart) exposed through an InheritedNotifier. Workout history
is normalized across sessions / exercise_logs / set_logs tables, so
logging a workout is a few row inserts rather than a rewrite of the whole
history; plan, in-progress draft, and settings live as rows in a small
meta key-value table. Domain models in lib/models.dart serialize to JSON
with stable string keys; all user-facing strings go through
flutter gen-l10n (lib/l10n/app_en.arb). The exercise library and plan
templates are code-defined seed data in lib/exercise_library.dart and
lib/plan_generator.dart.
The store keeps a synchronous public API by loading everything into memory
once at AppStore.open and writing incrementally. The schema version is
SQLite's PRAGMA user_version. Corrupt meta values are dropped, never crash
the app. Weights are stored in kilograms and converted at the display
boundary.
All data stays on the device, in a SQLite database inside app-local storage.
The app has no account system, no analytics, no crash reporting, and no server.
INTERNET is declared only in the debug manifest, so a release build cannot
make a network request at all. The only permissions it asks for are
notifications, if you switch on the daily reminder, and adding an image to your
photo library, which iOS requires because the share sheet offers "Save Image".
Full text:
rashadansari.github.io/Sweatline/privacy-policy
(source: docs/privacy-policy.md).
Keeping that true is a hard constraint. Adding a dependency that talks to the network invalidates the privacy policy and the "no data collected" answers filed with both stores.
Sweatline is not medical advice. Ask a doctor before you start a new training plan, and stop right away if you feel pain.
Found a bug, or want an exercise added? Open an issue.
MIT.