Smartwatches are usually tied to proprietary mobile apps and closed ecosystems. Open-source projects are changing this by allowing users to connect wearable devices with open platforms and build their own integrations.

This talk introduces the open smartwatch ecosystem through projects such as PineTime, Bangle.js, AsteroidOS, and Amazfish. The main focus will be on Amazfish, an open-source companion application connecting smartwatches with Linux-based systems.

We will look at the challenges of building a smartwatch companion app that runs across multiple platforms, including Ubuntu Touch, Sailfish OS, and desktop Linux via Flatpak. The talk will cover portability challenges, architectural decisions, and how open technologies enable a shared ecosystem across different devices and operating systems.