intervals.icu Sync

A small, friendly app that syncs your cycling activities to intervals.icu from iGPSPORT or Bryton Active. Enter your credentials once, press Sync, and your latest rides land on intervals.icu. You can also push planned workouts from intervals.icu to iGPSPORT or Bryton Active. Free and open source, for Windows and Android.

Features

• Syncs recent rides from iGPSPORT or Bryton Active to intervals.icu (original .fit files)
• Optional Dropbox upload — mirror activities to a Dropbox folder from the GUI (iGPSPORT or Bryton sync);
• Upload workouts — push planned cycling workouts from your intervals.icu calendar to iGPSPORT custom workouts or Bryton Active (sync to your head unit from the vendor app)
• Skips activities already uploaded so re-running is safe — with an optional force re-sync
• Lets you choose how many recent activities to process
• Workout upload window in Settings — how many calendar days to upload (default: today only)
• Sets the intervals.icu sport type after upload (e.g. Mountain Bike Ride / Gravel Ride) — iGPSPORT exports everything as a generic "Ride"
• Optionally deletes the local .fit files after a successful upload
• Stores your credentials in the OS secure vault (Windows Credential Manager / Android Keystore), never in a file
• Lets you know when a newer version is available
• Headless CLI — activity sync and workout upload from the terminal, with JSON output and exit codes for automation and AI agents (see CLI & automation)

Prefer the terminal, or want to help out? It's open source (Python + Flet, MIT) — see CONTRIBUTING.md.

Download & run (Windows)

1. Go to the Releases page and download the latest .zip.
2. Unzip it anywhere and double-click the app (e.g. intervalssync.exe).
3. On first launch, open Settings and enter:
   • your iGPSPORT email and password
   • your intervals.icu API key (intervals.icu → Settings → Developer)
4. Click Save, then go back and press Sync (or Upload to iGPSPORT / Upload to Bryton for planned sessions on your intervals.icu calendar).

Your password and API key are stored in your operating system's secure credential store — Windows Credential Manager on Windows (the same vault Windows uses for its own logins) — never in a plain text file.

Download & run (Android)

1. On the Releases page, download the latest .apk.
2. Open it on your phone. Android will ask you to allow installing from this source — accept (Settings → "Install unknown apps" for your browser/files app).
3. Open the app, fill in Settings (same fields as above), then Sync or Upload to iGPSPORT / Upload to Bryton.

On Android your credentials are stored in the Android Keystore. The app isn't on the Play Store, so the "unknown source" prompt is expected.

CLI & automation (AI agents)

Headless intervalssync CLI — sync from iGPSPORT or Bryton, upload workouts to iGPSPORT or Bryton, JSON on stdout. See Agent / headless sync.

Run from source

Requires uv.

uv sync
cp .env.example .env    # optional: credentials for CLI; IGPSYNC_DROPBOX_APP_KEY for Dropbox
uv run --env-file .env main.py

Build the Windows executable

uv run flet build windows

The distributable lands in build/windows/. (Flet downloads the Flutter toolchain on the first build.)

Roadmap

The app is built with Flet, so the same Python code targets desktop and Android today, with iOS (flet build ipa) possible from the same code.

Support

Tips on Ko-fi help fund bug fixes, releases, and new features. Thank you!

Acknowledgements

This project builds on community work around iGPSPORT activity access and syncing:

• kamikadzem22/igpsport-unoffical-api for documenting and exploring the unofficial iGPSPORT API.
• simple4wan/ride-sync for prior work on syncing ride activities between services.

This app is an independent project and is not affiliated with iGPSPORT, intervals.icu, or the projects listed above.