Write any time: help@ebbtides.app. A person reads every message — usually a real angler, usually within a day.
Ebb doesn't download tide charts — it computes them. Each station's harmonic constituents (the handful of numbers that describe how the sun and moon push that specific patch of water) are bundled inside the app. From those, Ebb calculates the tide for any date right on your phone, using no network at all. That's why it works standing on a jetty with zero bars: the math was already in your pocket before you left the house.
For the lock-screen countdown, press and hold the lock screen → Customize → tap a widget slot → add Ebb.
Settings → Restore Purchases signs the unlock back in on any device using the same Apple ID. There's no account and no password — Apple already knows you bought it.
Settings → Units toggles tide heights between feet and meters, and Settings → Time switches between 12-hour and 24-hour clocks. The change applies to the app, the widgets, and every alert instantly.
Different apps use different harmonic engines, and they round and interpolate a little differently — so you'll occasionally see a high tide listed a couple of minutes apart between two apps. Neither is "wrong." Ebb validates its predictions against NOAA's own published tide predictions and holds every high and low to within minutes of them. If you ever see a real discrepancy, email us the station and date — we take accuracy seriously.
Purchases run through Apple, so refunds do too: reportaproblem.apple.com. If something about Ebb let you down, we'd like to hear it regardless — it's how the app gets better.