A fully open source watch OS for Pebble.
Peblum is a fork of PebbleOS that keeps the whole stack open, from the firmware on your wrist to the app on your phone.
It is under active development and is not ready to be your daily watch firmware yet. Expect rough edges, incomplete features, and changes that break things. If you flash it, do so knowing that.
Why a fork
PebbleOS is open source, but the ecosystem around it is not entirely. Peblum exists to close that gap and to keep useful work moving.
- →Open all the way down. Replace the proprietary pieces of the stack with open ones, so the firmware and the companion app can be built and audited by anyone.
- →Battery life you control. Charge limiting keeps the battery off a full charge, which is the single biggest thing you can do for its lifespan.
- →Nothing you cannot rebuild. Every part of Peblum is source you can read, change, and ship yourself.
The ecosystem
The firmware is the foundation. These are open source apps and companions built around it.
Peblum firmware
The watch operating system itself, forked from PebbleOS and tracking it upstream.
Companion app
The phone app that pairs with the watch, being stripped of its proprietary dependencies and prepared for F-Droid.
Maps
Walking and cycling directions on the watch, with a small map of where you are and where the next turn is.
Claude for Pebble
A Claude AI client that runs on the watch, so you can ask a question from your wrist.
Open source, in the licence too
The firmware is licensed under the European Union Public Licence v1.2, a copyleft licence that keeps derivatives open. Code inherited from upstream PebbleOS stays under its original Apache 2.0 terms, and third party components keep their own licences.