digitalhen/bike-bar

Bike Bar puts the battery, range, and ride data from a Bosch eBike into a Mac menu bar app, a web dashboard, a local API, and event notifications. It works with Tern GSD bikes and any Bosch Smart System bike that has a ConnectModule, and it shows the same information you would see in Bosch's own eBike Flow app, just in more places. The project is unofficial and talks to Bosch's private servers using a reverse engineered login method from the official mobile app, so the author is upfront that it could break if Bosch changes something on their end. Most people only need the Mac app itself: download it, drag it into Applications, open it, and sign in with your existing eBike Flow account in a browser window. It is signed and notarized so macOS will not warn you when opening it, and it updates itself automatically. Once running, it lives quietly in the menu bar showing a battery icon and can send desktop notifications for things like the battery finishing charging or a ride ending. For developers, the same functionality is also available as a small Python backend you can run yourself: a REST API and web dashboard built with FastAPI, plus a dependency free command line tool. The web dashboard shows battery level, efficiency by riding mode, firmware details, and a map of past rides where the track is colored by speed, power, or cadence. Logging in this way is more involved, since Bosch's login flow is designed for its own mobile app, so getting the first access token means manually copying a code out of your browser's developer tools. The Mac app actually bundles this same backend inside itself as a background process, so most users never need to touch Python at all. The whole thing is aimed at Bosch eBike owners who want a quicker glance at their bike's status than opening the official app.