The short version: no accounts, no profiles, no stored events. Countdowns live in the link itself. Here's the little we do touch, and why.
You don't sign up to use Alarm-clock.org, and we don't keep a database of the countdowns you create. Everything that defines your countdown, the name, date, message and look, is encoded in the shareable link. If you delete the link, we have nothing left to delete. Remember that anyone you give the link to can see what's in it, so don't put private information in an event name or message.
When you create a countdown you can optionally enter an email address so we can send you your link. We use it for that single email and don't add you to any mailing list. If you contact us through the report or wrong-date forms, we only use the address you provide to follow up on that submission.
We use Google Analytics to understand which pages are popular (page views, approximate location, device type). This may set cookies; see Google's privacy policy for how it processes data. The site is served by Cloudflare, which processes IP addresses to deliver pages and protect against abuse. We also keep an anonymous per-page view counter, it stores a count, not who visited.
When you submit the report form or the wrong-date form, we keep the submission (the URL, your message and, if you include it, your email) long enough to act on it. Submissions are rate-limited by IP address to prevent abuse.
The service doesn't knowingly collect personal information from children, there are no accounts and no required personal fields anywhere on the site.
If we change how the site handles data, we'll update this page. The current version always lives at this address.