Wadehour
Wadehour: Offline Tide Tables
When, in daylight, the tide drops below the height you need.
For people who have to be on foot below a named tide height. Wadehour answers one question: when, in daylight, does the water at my station drop below the height I need? It is not a tide chart. Instead of drawing a line across a curve and leaving you to read the times off it, it lists each window, with both crossings worked out to the minute.
Today shows the next low tide, the day’s highs and lows, the day’s tide curve with a marker for now, and your next window.
- Not in the app stores yet
- Works offline
- No account
- Free tide tables. Pro plans a year ahead
Low-water windows.
Choose a height, and Wadehour lists every stretch in the next 7 days when the water at your station is below it: the day, the start and end, the length, the lowest water and its time, and how long the water keeps falling once the window opens.
Narrow the list to daylight only, to weekends, or to windows of at least 15 minutes, 30 minutes or an hour. A window that runs partly after dark says how many of its minutes are in daylight.
A window whose low only just dips under your line is marked “Only just”, because wind and pressure can hold the water higher than the prediction. Any single window can be shared as one line of text.
Your line, your height.
The height you set is your line, and it applies at every station. Type it, minus sign and all, in feet or meters above MLLW, the zero on NOAA’s tables.
The curve, day by day.
The Curve tab draws the tide for each of the next 7 days, with every high and low marked with its time and height, night shaded, and sunrise and sunset above each day. Drag along the curve to read the height at any minute.
A separate Sun and moon screen gives sunrise, sunset and the moon phase for the same 7 days, and the next moonrise and moonset.
Stations with no signal.
1,245 NOAA tide reference stations are bundled in the app. Search by station name or station number, and your favorites come first.
Times are shown in the station’s own time zone, with its abbreviation, wherever your phone is.
Every figure sourced.
Every number is worked out on your phone from the harmonic constants inside the app. The Sources screen names where they come from and the datum each height is measured from.
The app’s test suite holds its predictions against 480 high and low tides NOAA publishes for 2026 at four stations: San Francisco, Boston, Pensacola and Seattle. Window start and end times have not yet been checked against NOAA in a test of their own, so no figure is claimed for them.
What it is not
Wadehour predicts how high the water is, not how fast or which way it moves: there are no currents. It reads no weather, gauge or forecast, so it cannot see a storm surge. Only NOAA’s 1,245 harmonic reference stations are included, and a cove between them can run an hour or more behind the nearest one. There is no map, no home-screen widget and no watch app, and tide alerts (part of Wadehour Pro) can come up to an hour late unless the phone allows exact alarms. Its stations are NOAA’s, so outside the US it has almost nothing.
Wind, air pressure and river flow can hold the water a foot or more above or below the prediction. A window is a prediction, not a promise of dry ground.
Not for navigation. Wadehour does not know the depth of any water; never use it to decide whether a boat, a crossing or a route will clear. Not made by or connected with NOAA.
No account, no ads
No sign-in. No ads and no usage tracking. Your stations, your line and your settings stay in Wadehour on your phone, unless you send them or your phone’s own backup includes them. Settings can erase them. Google Play takes any payment for Wadehour Pro, and each time the app starts it asks RevenueCat, its billing service, whether Pro is yours; the privacy policy says exactly what it receives.
Near me asks for your position only when you tap it, uses it on the phone to sort stations, and never saves it. On Android 12 and later the phone’s prompt offers approximate location only. Say no and search by name, station number or state still finds every station.
Wadehour Pro, through Google Play, adds every low-water window up to 12 months ahead, the tide curve and sun and moon times to 30 days, the month table for this month and the next 12, tide alerts and export (copied for you to paste), with a free week first and no card needed. What’s free now stays free in every update after it.
Not in the app stores yet.