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brandonp2412/Flex

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brandonp2412/Flex has 452 GitHub stars and 50 forks. Star changes are not measured yet. Last checked 2026-11-10 19:20 UTC. Last push 2026-11-08.

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Offline-first workout tracker for strength and cardio, with progress graphs, rest timers, and custom themes. Built with Flutter.

452 stars50 forks

What you can do

  • Build custom workout plans
  • Log weights, reps, cardio, and rest periods as you train
  • Follow your progress with exercise history and graphs
  • Customize the app to your hearts desire

Measured star growth

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Net star changes over overlapping periods, not daily totals. Missing measurements are left blank. Stars measure attention, not software quality.

README.md

Original
Flex app icon

Flex

Track your training. Flex on people.

A private, offline-first workout tracker for logging gym sessions and building strength over time.

Get it on F-Droid Get it on Google Play Download from the Microsoft Store

Features

  • Build custom workout plans
  • Log weights, reps, cardio, and rest periods as you train
  • Follow your progress with exercise history and graphs
  • Customize the app to your hearts desire
  • Keep your data on your device—Flex works without an internet connection

Screenshots

Flex plan progress with exercises, sets, and weights Flex exercise graph showing dumbbell shoulder press progress Flex rest timer showing time remaining Flex workout screen showing selected days and exercises Flex workout plans screen with scheduled workouts and exercises Flex graphs screen showing exercise performance records Flex settings screen with appearance, data, plans, timers, and workouts options Flex history screen listing recorded exercise sets and weights

Build from source

Flex is open source and built with Flutter.

flutter pub get
flutter run

Contributions are welcome—see CONTRIBUTING.md. Flex is available under the MIT License.

Support Flex

Contributions to Flex are directly correlated with gains.

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