Bangle.js 3 Launches as a Hackable Open-Source Smartwatch With a Bosch Gas Sensor
The Bangle.js 3 is a new round smartwatch aimed at users who care more about customization, repairability, and experimentation than mainstream fitness features. Instead of trying to compete with premium wearables packed with GPS, NFC payments, and advanced health tracking, this device takes a different route: it is built for tinkerers, developers, and open-source enthusiasts.
One of its most unusual features is a Bosch gas sensor, designed to detect certain smells and environmental changes. This gives the smartwatch a unique edge compared to many standard wearables, especially for users interested in experimenting with air-quality or scent-based applications. An LED flashlight is also included, adding a practical tool for everyday use.
The Bangle.js 3 runs on an open-source operating system, which is one of its biggest selling points. Because the software is open, the community can build apps, add features, and customize the watch far beyond what a typical closed smartwatch allows. For developers, hobbyists, and makers, this makes the device especially appealing.
Hardware accessibility is another key part of the design. The case can be opened easily using a few screws, making it more repair-friendly than many modern smartwatches. Four external pins provide power and data access for diagnostics and programming, which further highlights its focus on development and experimentation.
Inside, the smartwatch uses an ARM Cortex-M33 nRF54L15 processor with clock speeds of up to 128 MHz. It also supports Bluetooth Low Energy and includes 32 MB of memory. While these specifications are modest compared to high-end smartwatches, they are well suited for lightweight apps, efficient performance, and longer battery life.
The watch is powered by a roughly 200 mAh battery and supports wireless charging. Thanks to its efficient hardware and lightweight software, battery endurance should be one of its stronger points, especially for users who do not need power-hungry features like GPS tracking or always-on advanced health monitoring.
The Bangle.js 3 is not designed to be a luxury fitness watch or a full smartphone replacement on the wrist. Instead, it stands out as a compact, open, and developer-friendly smartwatch with distinctive hardware features. For anyone looking for an open-source smartwatch that can be modified, programmed, and expanded by the community, the Bangle.js 3 offers a refreshing alternative to the more locked-down devices on the market.
