Open-Source eInk Bike Computer
OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
Open-Source eInk Bike Computer launched on September 4, 2026 with 421 votes, #15 of 8,097 launches that month and more than 99% of that year's launches.
In plain words
OpenTrailPaper is open-source firmware for building a DIY bike computer using the LilyGO T5S3 e-paper display. It enables riders to view offline maps, follow GPX routes, record rides as FIT files, and connect Bluetooth sensors, all without needing a phone during the ride. An optional iOS companion app handles route planning, map building, and firmware updates. The software is free and requires no subscription or account.
written from the facts on this page · September 2026
From the sources
OpenTrailPaper is firmware for the LilyGO T5S3 4.7" E-Paper PRO. It shows ride data and offline maps, follows GPX routes, records FIT files and connects to Bluetooth sensors. You buy and protect the board yourself. Each item shows the screen it describes. Use the orange touch target on the device to move between related screens. The iOS and Android companions can plan and transfer routes, build offline maps, copy recorded rides, change settings and install firmware updates over Bluetooth. The head unit does not need the phone during a ride. After routes and maps are loaded, the head unit can record and navigate by itself. There is no account or subscription. The app is used when you want to…from opentrailpaper.com
Pricing, as stated on its site
Free — Open-source DIY e-paper bike computer firmware. No subscription or account required. Free to use with compatible hardware (LilyGO T5S3 board). Optional free iOS companion app available.
checked September 2026 · prices change
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