Tideline: Offline Tide Charts

NOAA tides, no signal needed

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Tide predictions for 3,493 NOAA stations, computed on your phone. No network request, ever. Tide predictions for every NOAA station, computed on your phone. Tideline makes no network request at any point after you install it. WORKS WHERE YOUR SIGNAL DOES NOT Most tide apps ask the internet. Tideline does the astronomy itself, from harmonic constants published by NOAA and bundled with the app. Down a canyon, offshore, on a beach with no bars, in airplane mode — it just works. WHAT YOU GET • 3,493 NOAA tide stations: 1,251 reference stations and 2,242 subordinate stations • The full tide curve for any day, not just a table of times • High and low water with heights above mean lower low water • Where the water is right now, and whether it is rising or falling • Times shown in the station's own local time, daylight saving handled correctly, computed offline • Find the stations nearest you, or search by name or state BUILT TO BE RIGHT Tideline uses the harmonic method, the same one NOAA's own published tables come from. Predictions are checked against those tables: across a month, most stations agree to within a few hundredths of a foot, and the largest tide in the country agrees to about one percent of its 35-foot range. Predictions are astronomical. They do not include weather — wind and barometric pressure routinely move real water by a foot or more, and by much more in a storm. Do not use any tide prediction as your only source for navigation. NO ADS, NO SUBSCRIPTION, NO DATA COLLECTION Free: every station, the full curve, seven days ahead, two saved stations. One payment lifts the station limit and extends predictions to a full year. It never expires. There is no advertising, no subscription, no account and no analytics. Tideline collects nothing. If you grant location access it is used only to sort the station list by distance, and it is never stored or sent anywhere. Harmonic constants, datums and prediction offsets are published by the NOAA Center for Operational Oceanographic Products and Services. Tideline computes predictions from them; it is not endorsed by NOAA.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, SEDX LLC, 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 Linked to You

    The following data may be collected but it is not linked to your identity:

    • Purchases

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
SEDX LLC
Size
36.6 MB
Category
Weather
Compatibility
Requires iOS 15.1 or later.
  • iPhone
    Requires iOS 15.1 or later.
  • iPad
    Requires iPadOS 15.1 or later.
  • iPod touch
    Requires iOS 15.1 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2026 SEDX, LLC
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

    More by SEDX LLC

    You Might Also Like