Mobile app · Everyday life

Flex: Gym Workout Log

Log workouts, reps, cardio, and rest timers. Track strength offline.

Completely free
Windows and Android
Open source
No account

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by GitHub, F-Droid
License: MIT — Open source (permissive)confirmed by GitHub, F-Droid
Open source: Yes
Commercial use: Yesconfirmed by GitHub, F-Droid
Account required: Noconfirmed by GitHub
Credit card required: Noconfirmed by GitHub, F-Droid
Watermark: Not applicable
Ads: No
Platforms: Windows and AndroidEstablished by Android: F-Droid, GitHub · Windows: GitHub
Distribution: Available on F-Droid
Publisher: Brandon Dick
Latest version: 2.2.38 (1 November 2026)
Latest activity: 1 November 2026
Source code: github.com/brandonp2412/Flex

Overview

Flex: Gym Workout Log is a fitness tracking mobile app, available on Windows and Android.

Features described in its GitHub repository: offline use, themes and dark mode.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Offline-first workout tracker for strength and cardio, with progress graphs, rest timers, and custom themes.” — GitHub, 10 November 2026
“Offline-first workout tracker for strength and cardio, with progress graphs, rest timers, and custom themes.” — GitHub, 10 November 2026
“Offline-first workout tracker for strength and cardio, with progress graphs, rest timers, and custom themes.” — GitHub, 10 November 2026

At a glance

All of Flex: Gym Workout Log is free: no feature is locked behind a paid plan, and its code is open.

Its licence (MIT) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

Open source code
No account needed
No advertising
Commercial use allowed

Sources and checks

Facts collected from GitHub (credit card, account, source code, publisher, licence, free status, platforms, commercial use) — 9 November 2026
Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) — 6 November 2026
Last technical check: 6 November 2026
Description from F-Droid — F-Droid (citation courte)

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