Privacy Policy

Last updated: November 13, 2026

The short version

Slackwater collects no data. There is no account, no server of ours, no analytics, no advertising, and no tracking of any kind.

What stays on your phone

Your stations, their saved tides, your alert and appearance settings, and the unlock flag are stored only on your iPhone. Deleting the app deletes them.

The requests the app makes

To download tides, Slackwater asks NOAA's public CO-OPS tide service (api.tidesandcurrents.noaa.gov) for one station's predictions. The request carries that station's ID and a date range, and nothing about you. NOAA's own privacy policy applies to its servers. Slackwater is not affiliated with or endorsed by NOAA.

Your location

Only if you tap "Find stations near me" does Slackwater ask for your location, once, with your permission. It is used on your phone to sort the bundled station list by distance, and is never stored or sent anywhere. Searching by name works with location off.

Tide alerts

Alerts are local notifications built on your phone from the saved tides. No notification data leaves your device.

The one-time purchase

The unlimited-stations purchase is handled entirely by Apple's App Store under Apple's privacy policy. Slackwater only stores a local flag that the unlock was bought.

What we don't do

We don't collect usage statistics, crash reports, identifiers, or location. We don't sell or share data. There is no data to sell or share.

Contact

Questions? See the support page.