OpenTrailPaper
Open Source Eink Bike GPS
About
Plan routes, create offline maps, and review cycling activities with this open-source companion app. It syncs seamlessly with a DIY e-paper bike computer, offering turn-by-turn navigation and ride data analysis without requiring an account or subscription.
What's New in OpenTrailPaper
1.0
August 13, 2026
Developer apps
FAQ
What is OpenTrailPaper?
OpenTrailPaper is a free, open-source companion app designed for the OpenTrailPaper e-paper bike computer. It helps you plan routes, build offline maps, and review your cycling rides, syncing everything to your device via Bluetooth.
Does OpenTrailPaper require a subscription?
No, OpenTrailPaper does not require any account or subscription. It is completely free to use and all your routes and ride data remain on your own devices.
Can I use OpenTrailPaper offline?
Yes, once set up, OpenTrailPaper works completely offline. You can plan routes and create offline maps that function without a phone signal or data connection on your bike.
What kind of data can I review with OpenTrailPaper?
After a ride, OpenTrailPaper allows you to review metrics such as distance, moving time, speed, elevation gain, power, and heart rate. Your ride track is also displayed on a map.
What devices does OpenTrailPaper support?
OpenTrailPaper is currently supported on iPhone. It is designed to pair with the DIY OpenTrailPaper e-paper bike computer.
How often is OpenTrailPaper updated?
The latest version of OpenTrailPaper is 1.0, and it was last updated on August 13, 2026. Updates for firmware can be applied over the air with a single tap.
What are the privacy implications of using OpenTrailPaper?
OpenTrailPaper prioritizes user privacy. It requires no account, no cloud storage, and nothing is uploaded. Your routes and ride data stay exclusively on your devices.
How does OpenTrailPaper use my location?
Location services are used only while you are using the app to show your position on the map, help your device's GPS lock on faster, and act as a backup fix when the device cannot see the sky.