Your bike's health record.
ChainLog counts your verified kilometres, warns you before a part gives out, and keeps a signed history.
Maintenance certificate
VERIFIED
26 · 04 · 2026
Mileage verified via Strava.
7 maintenance records declared.
Not all kilometres are equal.
Most apps show you a total. ChainLog shows you where each kilometre comes from, and only verified kilometres count as proof at resale.
Synced automatically from your bike computer. The source a buyer can cross-check.
Your rides from before ChainLog, or another app. Dated, but not tied to a third-party account.
The trainer, the ride with no bike computer. Counted honestly, flagged as declared.
Why it matters: at resale, a buyer can tell a bike with 18,000 proven km from one they're just asked to «trust». That's the certificate.
From your first ride to the certificate.
Connect Strava
Or Ride with GPS, a GPX file, or just your email. Your rides come in without you lifting a finger.
Sort your km by bike
Each ride goes to the right bike. Arriving with an already-ridden bike? Set its starting mileage.
Get the alert before it breaks
When the chain's wearing out, you get an email. You replace it for €25 instead of €80.
Pull the certificate at resale
A public SHA-256-signed link. The buyer reads the history instead of taking your word.
You know you should check your chain.
Except you don't, and nobody really does. The €5 chain checker sits at the back of a drawer, and by the time you think of it, the cassette's gone with it.
ChainLog reminds you at the right moment. No fake number to the kilometre, just a clear range: 2,000 to 5,000 km depending on how you ride.
Replacing on time costs less.
A worn chain left to run eats the cassette. The €25 part becomes an €80 repair. ChainLog warns you while it's still €25.
The log is free, and it'll stay free. No ads, no selling your data.
Your bike up to date, your mind at ease.
Ready to ride whenever you want, and real proof the day you resell. Free, multi-bike, no strings. Connect Strava or start with your email.