Privacy.

There's nothing to sign up for. If you turn on notifications, a push token is the only identifier.

Notifications need a point to measure from. It's rounded to about 0.7 miles before it's stored, and no history is kept. Turn notifications off and it's deleted.

Sent alerts are kept for 24 hours. A device we haven't heard from in 30 days is removed, with everything kept for it.

Apple or Google deliver notifications. The services below receive only what's listed. No analytics, in the app or on this site.

• Apple Push Notification service
• Google Firebase Cloud MessagingAndroid only: delivers the notification; the device's push token, never an account
• Terra Listensmigration events only: a radar station, a time and the bloom's measurements; never a device, a token or a place
• Google Play IntegrityAndroid only: a token showing the app came from Google Play; never an account or a place

No cookies, no trackers, no third-party scripts, no fonts from anywhere else.