Privacy

Last updated 13 July 2026

The short version: your video is never uploaded. It is read and analyzed by your own browser, on your own device. There are no accounts and no cookies. Page-view analytics are counted, but they are anonymous and know nothing about your video.

Your video and your camera

When you choose a file or record with your webcam, the video stays in your browser's memory. It is never sent to a server, and no copy of it is kept after you leave the page. Camera access is only requested at the moment you press Record, and the stream is only used to make that recording.

What is stored on your device

Two things are saved in your browser's local storage, on your device only:

Your saved results (bfa-history) — the measured angles, the grades, the bike type, and a small thumbnail image of the analyzed frame. This is what the "Saved results" list reads from. You can delete any entry, or all of them, with the buttons there.
Your language choice (bfa-lang) — so the page opens in the language you picked.

Neither is ever transmitted anywhere. Clearing your browser data deletes both.

What your browser downloads from other servers

This is the one place where something leaves your device, so it is worth being precise about it. To analyze a clip, your browser downloads the pose-detection model and its runtime:

the MediaPipe runtime from cdn.jsdelivr.net
the pose model file from storage.googleapis.com (Google)

As with downloading any file from any website, those servers can see your IP address, your browser type, and the fact that a file was requested. They receive nothing about your video — no frames, no images, no measurements. The analysis itself happens after the download, entirely on your device.

Analytics

This site counts page views using Vercel Web Analytics. It is cookieless and does not build a profile of you or follow you across other sites. It records things like which page was opened, the referring site, and a coarse country and device type. It records nothing about your video, your camera, your measurements or your saved results — those never leave your device, so there is nothing for it to see.

Hosting

The site is hosted on Vercel, which — like any web host — keeps standard server logs of requests (IP address, time, page). This site adds no tracking on top of that.

Links out

The pages link to GitHub, Strava, and Ascent Analytics. If you follow one of those links, that site's own privacy policy applies. Nothing about your bike fit goes with you.

Questions

The full source is published, so you can check every claim above for yourself. Questions or corrections are welcome on GitHub.