Privacy
This site documents one person's 91-day challenge: mine. It is run by Fabio Crestoni (fabio.crestoni@gmail.com) and hosted in the EU (Hetzner, Finland). Last updated 22 September 2026.
What the site publishes about me
Daily photos, weight, what I ate (from Yazio), steps and walking metrics (from the iPhone Health app), and, once connected, sleep, recovery, strain and workouts from WHOOP. I chose to publish all of it. The WHOOP connection reads recovery, cycles, sleep, workouts, my profile and body measurements, through WHOOP's official API, and nothing else; it writes nothing back to WHOOP. Those tokens are stored encrypted on my server and can be revoked at any time from my WHOOP account.
What the site collects about visitors
Nothing, unless you tap something. There is no analytics script, no advertising pixel and no tracking cookie. If you cheer a day or vote a word of the week, the site sets one first-party cookie with a random id so the same browser is counted once; it stores only a keyed hash of that id, never your IP address, and there is no way to type free text. The cookie set by /?today only remembers which day the home page opens on.
Sponsors
If you sponsor a day, the site keeps your name, link, email and the artwork you upload, and shows the name, link and approved artwork on the sponsored day. Payments are handled by Dodo Payments, the merchant of record: the site never sees card details. Transactional emails are sent through Resend.
Your rights
Sponsors and cheering visitors can ask for their data to be shown, corrected or deleted by writing to the address above. Deleting the cheer cookie in your browser removes the only link between you and your taps.