Tidemark: NOAA Tide Widget
Lock Screen & Home Tide Times
Only for iPhone
$3.99 · Designed for iPhone. Not verified for macOS.
iPhone
Next high & low tide on your Lock Screen and Home Screen. Official NOAA predictions for 3,000+ US stations. One price, no subscription, no ads, no account. Ever.
Tidemark puts the next high and low tide on your Lock Screen, Home Screen and StandBy, from the official NOAA predictions. It is for anyone who plans a day around the water: a beach walk, fishing, surfing, kayaking, boating, clamming, or getting off the dock before low water.
Every widget is included. All six sizes ship in the app: Lock Screen rectangular, circular and inline, Home Screen small, medium and large, and StandBy at night. Each widget keeps its own station, so two coasts can sit on one screen. Nothing is behind a paywall.
Pay once. No ads, no audio ads, no surveys, no subscription, no yearly data packs.
Official NOAA CO-OPS predictions for 3,270 US tide stations, heights on the MLLW datum. The station list is built into the app, so search works before you have a signal. A seven-day table of every high and low, and a curve you can scrub to read the tide height at any minute.
Daylight low tides. Pick a height, such as -0.5 ft, and Tidemark lists every low at or below it that falls between sunrise and sunset over the next twelve months, with weekends marked. Add any of them to your calendar in one tap. Made for tidepooling, clam digging and low-tide hikes.
Water temperature. At stations with a NOAA sensor, the latest reading shows on the Today screen and the medium and large widgets.
Instant and offline. Up to twelve months of predictions for your station and favorites are cached on your phone, so the app and the widgets still draw the curve with no connection, and tell you how old the data is. Large high-contrast type, dark mode, and VoiceOver labels on the tide times.
No account, no sign-in, no tracking, no analytics, no third-party SDKs. The only server the app ever contacts is NOAA. Feet or meters, 12- or 24-hour, times in your device's time zone. Built for iOS 17 and later.
Tide predictions: NOAA CO-OPS. Not for navigation. Tidemark is not affiliated with NOAA.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Daylight low tides: find minus tides between sunrise and sunset for the next 12 months, and add any of them to your calendar.
- 12 months offline: predictions for your station and favorites are saved on your iPhone, so the app and widgets keep working without a signal.
- Water temperature on the Today screen and the medium and large widgets, at stations with a NOAA sensor.
- Fixed: the large widget no longer cuts off the next tide time when heights are in meters.
- Still no account, no tracking and no new permissions.
The developer, Zhenyi Tong, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Zhenyi Tong
- Size
- 2.8 MB
- Category
- Weather
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Zhenyi Tong
