To set and share an alarm, the code and time are stored on Cloudflare's servers. Anyone with the URL can see and change the alarm. No passwords, no accounts, that's how it works.
If you enable notifications, your device's push subscription is also stored there alongside the alarm. Alarm data expires automatically after 90 days. Cloudflare may log your IP as part of standard web security, same as any website.
To remove your data: stop using the URL. It expires on its own. There's nothing to delete and no account to close.
Set an alarm and share the link. Whoever has it open gets a softer version, no waking you to check.
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This link is the alarm. Anyone who has it can see and change it — no passwords, no accounts, that's how it works. Share it with the person who needs it. Don't post it anywhere public.