# OpenTrailPaper — Open Source Eink Bike GPS > Open-source e-paper bike computer companion for route planning and ride analysis. (iPhone/iPad app by Raemond Bergstrom-Wood.) - Source: https://appshunter.io/ios/app/opentrailpaper/id6793646642 (this page in markdown: same URL + `.md`) - Developer: [Raemond Bergstrom-Wood](https://appshunter.io/developer/1207444822) - Category: Health & Fitness, Utilities - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 17.0 · 3 MB - Released: 2026-08-12 - Data updated: 2026-08-29 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/opentrailpaper/id6793646642/reviews.md ## What is OpenTrailPaper? OpenTrailPaper is the free companion app for the OpenTrailPaper e-paper bike computer — an open-source, sunlight-readable head unit you build yourself. The app handles everything that's awkward on a touch e-paper screen: planning routes, building offline maps, and reviewing your rides. Then it sends it all to your head unit over Bluetooth. No account, no cloud, no subscription. PLAN ROUTES — Search for any destination, preview the route on the map, and send it to your device as a GPX file. Turn-by-turn prompts guide you along the way — and your head unit follows the route even with no SD card and no signal. OFFLINE MAPS — Pick the area you ride and the app bakes offline map tiles straight onto the device's SD card. Roads, water, and parks render on the e-paper display wherever you go — no data connection required, ever. REVIEW YOUR RIDES — Pull your recorded rides off the device and see distance, moving time, speed, elevation gain, power, and heart rate, with your track drawn on the map. Every ride is a standard .fit file you can export and open anywhere. TUNE YOUR DEVICE — Adjust FTP, time zone, units, and backlight, and pair Bluetooth heart-rate and power sensors — all from your phone. Settings are saved to the device's flash so they persist across reboots. When a new firmware build is ready, update over the air with one tap. BUILT TO STAY OUT OF THE WAY - Works completely offline once set up — no phone or signal needed on the bike - No account and no subscription, ever - Nothing is uploaded; your routes and rides stay on your own devices - Fully open source WHY LOCATION AND BLUETOOTH — Bluetooth connects the app to your head unit to sync routes, maps, settings, and rides. Location (only while you're using the app) shows your position on the map, warm-starts the device's GPS so it locks on faster, and acts as a backup fix when the device can't see the sky. OpenTrailPaper pairs with the DIY OpenTrailPaper head unit. Build instructions, firmware, and full source are on GitHub. ## Key features - Route planning with destination search - Offline map creation for any area - Ride review with detailed metrics - Device tuning and sensor pairing - Bluetooth syncing with head unit - Completely offline functionality ## Frequently asked questions about OpenTrailPaper ### 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. ## Version history (last 2 releases) ### 1.1 — 2026-08-27 the workout release: - builder/import/edit (including editing workouts already on the device) - dashboard editor with drag-and-drop pages, music support and the new workout page. ### 1.0 — 2026-08-13 No release notes. ## More apps by Raemond Bergstrom-Wood - [Daily Cals](https://appshunter.io/ios/app/daily-cals/id1614789690) - [Wave Organ](https://appshunter.io/ios/app/wave-organ/id6748617734) - [Ride Call: the Cycling Planner](https://appshunter.io/ios/app/ride-call-the-cycling-planner/id6756632074) All apps by Raemond Bergstrom-Wood: https://appshunter.io/developer/1207444822 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*