OpenTrailPaper

Open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO

Unclaimed

35 ratings3.83

Saves424

CategoryHealth & Fitness

PlatformWeb

PricingFree

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OpenTrailPaper is open-source firmware for the LilyGO T5S3 4.7" E-Paper PRO board, turning it into a DIY e-paper bike computer. It supports offline maps, GPX route navigation, FIT file recording, Bluetooth sensor connectivity, and can operate independently without a phone during rides. Companion apps for iOS and Android facilitate route planning, file transfers, settings management, and firmware updates.

open-source

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3.83

35 reviews

Product

4.33

Design & Polish

3.83

Performance

3.33

Mobile PageSpeed

Performance: 83 out of 100, Needs improvement
Accessibility: 89 out of 100, Needs improvement
Best Practices: 100 out of 100, Good
SEO: 100 out of 100, Good

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Anonymous reviewer

9/14/2026

interesting if you like tinkering more than shopping. the e paper screen and open firmware are the draw, but the bare board status means this is closer to a project bike than an off the shelf computer.