Tidewell
iOS
Tide times that work with no signal.
Tidewell is a calm, offline-first tide app: high and low tide times, a live tide curve, and gentle alarms for 4,300+ coastal stations worldwide. Every prediction is computed on your device with the standard harmonic method, so a beach, a boat, or a remote harbour with no reception still gets exact tides. Sunrise, sunset, and moon phase come along for the trip. No account, no sign-in.