openGym

Your workouts.
Your weights.
Your data.

A free, open-source gym and body-weight tracker. No subscription, no account required, and no telemetry — not now, not later.

Get openGym Try the live demo
openGym home screen: the week at a glance, today's session and a body-weight chart

Features

Built on the gym floor.

Every feature here exists because something was awkward between two sets. Nothing is here to sell you anything.

Guided workouts

It already knows what day it is. Today's session opens with your weights from last time filled in, rest timed between sets, and a PR called out the moment you beat one.

Progression that follows a rule

Linear, Greyskull LP, double progression or added time, set per routine and overridable per exercise. The targets are right when the session opens, and each one tells you where it came from.

An AI coach, if you want one

Optional, off by default, and it runs on whatever AI you bring — an Anthropic, OpenAI or Gemini key, any OpenAI-compatible endpoint such as Ollama on your own network, or a Claude Code / Codex runtime in the container. Nothing it proposes is applied on its own; every change carries its reason and can be undone.

PlanA week of routines from a few questions: goal, days, session length, equipment, limits.
ReviewReads what you actually logged — stalls, effort, body weight — and proposes changes with the evidence.
PrivateAn allowlist under an opaque handle leaves your server. Keys stay encrypted; admins see counts, never questions.

A muscle map that reads three ways

The same body diagram, three questions.

BalanceWhere the volume actually went, and which muscles got nothing.
FatigueWhat is still recovering, weighted by how hard each set was.
StrengthHow long since you trained it, and the lifts behind it with their estimated 1RM.

1,324 exercises

Animated demos, searchable, filtered by body part and by the equipment you actually own. Add your own and they behave like the rest.

Body weight, with a goal line

An interactive chart with your target drawn across it. Every change is coloured by whether it moved you toward it.

A year of training, at a glance

Every session as a square in a heatmap, shaded by how long you trained. Streaks counted, quiet weeks impossible to miss.

And the rest of it

Nineteen more things it does.

Weekly plan A routine per weekday. Any single day can be moved when life happens, without editing the plan itself.
Weeks start where you say Monday or Sunday. The plan, the day strip, the calendar and every “this week” total move with it, so the app reads like the calendar you already use.
Supersets and cardio Plan them, or pair two exercises mid-session and unpair them again. One rest per round, and time-plus-speed logging where weight times reps says nothing.
Timed sets Planks, hangs and carries are logged by time, with a timer for the set itself. Stop early and it records what you actually held.
Warm-up sets Mark the ramp-up rows and they stay out of your 1RM, your progression and the fatigue map. Present in the session, absent from the numbers.
Plate math Barbell work shows what goes on each side — Bar 20 kg · 30 kg per side — from the bar weight for that exercise. You still log the total.
Estimated 1RM Per exercise, from your best eligible set, naming which set it used. It will not guess above 12 reps.
Structural Balance Your lifts compared with each other against the Poliquin, Thibaudeau and ATG ratios, with the weakest link named.
Effort per set Rate a set as RIR or RPE, whichever scale you already think in. Optional, and each set keeps the scale it was logged with.
Fix a workout afterwards Edit the weights, sets, exercises, date or duration of a saved session, add photos or videos to it, or log one you did on paper. Records re-read the corrected history.
Your own pictures Give an exercise you made a photo, GIF or short video and a link to a guide. Shrunk and stripped of location data on the phone before it goes anywhere.
Share a plan Send someone your routines as a small file, or print them as a clean PDF. No workouts, no weigh-ins, and importing merges instead of overwriting.
Bring your history Import from FitNotes, Strong or Hevy, including the RPE they recorded, or body weight straight out of an Apple Health export. How importing works →
The screen stays awake No unlocking the phone between sets. The display stays lit while a workout runs and lets go the moment you finish.
17 languages The full interface, Arabic right to left, exercise instructions in 12 languages and translated exercise names in seven, all loaded on demand.
Passkeys, not passwords Self-hosted profiles sign in with Face ID or a fingerprint, on as many devices as they like. A password is there if the instance switches it on. Everyone’s data stays their own. Self-hosting guide →
Designed, not assembled Light and dark themes, eight accent colours, a hand-drawn icon set, and the same layout on every phone.
Ask an AI about your training An optional MCP server lets a client like Claude Desktop read your history in plain language. Read-only, on your machine, and not part of the Docker build. Set up the MCP server →
Yours to keep One-tap JSON export and import. Your training log is a file you own, not a row in someone’s database. Backups →

Screenshots

Five screens, and that's the app.

Home screen with the weekly overview and body-weight chart
Home
Guided workout screen with sets, rest timer and pre-filled weights
Workout
Stats screen with the activity heatmap and charts
Stats
Weekly plan screen with a routine per weekday
Plan
Exercise library with search and filters
Library

Swipe through them.

Live demo

Try it right here.

The real app with a seeded example history, running in your browser. Start a workout, break something, change anything you like.

Demo data lives only in this browser and can be reset from its own Settings. Open it full-screen if you would rather have the room.

The demo wants the whole screen to itself. Its data lives only in this browser and can be reset from its own Settings.

Open the live demo

Get openGym

One app, two flavors.

Same codebase. The choice is where your data lives: entirely on your phone, or on a server you control.

Mobile app

For anyone. Install it and you are done.

  • Everything stays on your phone
  • No account, no server, no setup
  • Native workout-day reminders
  • Backups through the share sheet
  • No sync across devices
Download for Android

v1.3.9 · 16.2 MB · Android 6.0+ · signed APK. Your browser will ask before installing; that is normal outside the Play Store.

Every release is also built and signed by CI and attached to the GitHub releases page, checksums and all.

On iPhone? Apple does not allow installs outside the App Store. Use the self-hosted version as a home-screen app instead, or see the docs.

Self-hosted

For homelabbers, and the people they train with.

  • Sync across all your devices
  • Passkey profiles for several people
  • Your data readable on the desktop
  • A home-screen app on iPhone and Android
  • One docker compose up
Self-hosting guide

AGPL-3.0 · prebuilt images for amd64 and arm64

openGym started as a tiny app I built for myself. I wanted to log my workouts and my weight without a subscription app claiming my training data. Then friends wanted in, and it grew a mind of its own.

Duarte Santos · read the whole story

Open source

AGPL-licensed, and staying that way.

The code is public, the license keeps every fork open, and there is no commercial edition waiting behind a curtain.

openGym in numbers counts are live
–stars
–forks
–open issues
–on Discord
1,324exercises
17languages
openGym on GitHub ★ Contributing Changelog

Elsewhere

Where openGym lives.

GitHub The code, the issues, the pull requests and the releases. Home of the project; every release is published here with its APK and checksum. Open the repo GitLab mirror The same repository, kept in sync automatically. Its CI builds the container images and signs every APK — nothing is merged here. Open the mirror Buy me a coffee openGym is free, and stays free. If it saved you a subscription, this is the one place to say thanks. Support the project Discord Releases, self-hosting help, and somewhere to report a bug. Docker, reverse proxies and passkeys — new versions land here first. Join the server