Fully offline
Great for alerts with no signal
Free
In-App Purchases
About
Get accurate, offline tide predictions for over 1,200 US coastal stations. Pin your favorite locations, set custom alerts, and view tide charts with live countdowns, all without an internet connection. This app is designed for planning and recreational use.
✓Offline tide predictions
✓1,200+ US coastal stations
✓Customizable favorite locations
✓High/low tide alerts
✓Live countdowns
✓Clean tide charts
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What's New in Tidekeeper
1.1
July 5, 2026
Bug fixes and improvements
1
In-App Purchases
$4.99
Tidekeeper Pro
Unlimited favorites, alerts & forecast.
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Developer apps
FAQ
Does Tidekeeper have ads?
No, Tidekeeper is completely ad-free. The developer explicitly states 'NO ADS' and 'NO TRACKING' in the app description.
How accurate are Tidekeeper's predictions?
Tidekeeper's predictions are derived from official NOAA CO-OPS published harmonic constants and are referenced to Mean Lower Low Water (MLLW). They closely match NOAA's official predictions for planning purposes.
Can I use Tidekeeper without an internet connection?
Yes, Tidekeeper is designed to work completely offline. All tide height computations are done on-device, ensuring functionality even in areas with no signal.
What is the cost of Tidekeeper Pro?
Tidekeeper Pro is available as a one-time purchase, with no subscription required. This unlocks unlimited favorite stations, alerts on as many stations as you like, and the extended forecast.
What age rating does Tidekeeper have?
Tidekeeper has an age rating of 4+. This indicates it is suitable for children and general audiences.
How often is Tidekeeper updated?
The latest version of Tidekeeper was released on July 2, 2026, indicating recent development activity. The app was initially released on July 1, 2026.
What devices does Tidekeeper support?
Tidekeeper is currently supported on iPhone devices. It is not specified if it is available for iPad or other Apple devices.
Is Tidekeeper suitable for navigation?
No, Tidekeeper is intended for planning and recreation only. It should not be used as the sole tool for navigation or life-safety decisions; always consult official sources and local conditions.