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Hack · Garmin watches

Build and load your own watch face or app

Garmin's free Connect IQ SDK compiles a watch face, widget or data field that drops onto your own watch over USB, no app store review needed to try it yourself.

Build a watch face with Garmin's own tools, test it in the simulator and load it directly onto a compatible watch for your own use.

Does it work on mine

Garmin watches's models, not checked against this hack specifically yet

ForerunnerFenixVenuVivoactiveInstinct

What it costs

An evening~1 hNo risk

Check the exact watch in Garmin's compatible-device list; you need a Connect account, Java, the SDK Manager and the Monkey C extension for VS Code, plus a developer signing key. Garmin's setup guide lists the current software requirements.

Steps

  1. Set up the SDK, extension and signing key with Garmin's getting-started guide.
  2. Create a watch-face project, select your supported device and run it in the simulator using Your First Connect IQ App.
  3. Follow the guide's Side Loading an App section to build for your watch and copy the resulting app over USB.

Risks and undo

Garmin warns that a poorly designed watch face can greatly reduce battery life, so test it before relying on it. Switch back to a built-in face to stop using the test face; keep the signing key private and backed up, as losing it prevents updates to an app published with that key.

Sources

Other hacks for Garmin watches

Checked on Oct 29, 2026