What we keep, and why.

When you subscribe

We store your email address, the time you signed up, the page you signed up on and the wording shown next to the form. We use it for one thing: sending you the morning letter.

To stop abuse of the sign-up form we also keep a one-way hash of your IP address, which changes every day, for 24 hours.

Who handles it

The site, the sign-up form and the subscriber list run on Cloudflare. Emails are sent through Resend. Neither receives your address for any other purpose than running this service. We do not sell or share the list, and the letter has no tracking pixels or tracked links.

The calculators

The challenge and size calculators run in your browser. The numbers you enter are not sent to us.

Leaving

Every email, starting with the welcome email, has a one-click unsubscribe link. You can also email [email protected] to leave, or to ask what we hold about you or to have it deleted.

Last updated 18 October 2026.