Tideglass vs TideCheck

Tideglass is a free, offline tide instrument for iPhone and Apple Watch. Designed like a vintage marine chronometer in brass and navy — no ads, no accounts, no internet required. FEATURES ◆ ~8,000 tide stations worldwide, all bundled in the app ◆ Pannable 24-hour chart with a static centre cursor — swipe to scrub ±7 days, with a magnetic snap when you cross "now" ◆ 30-day histogram: every day's maximum high and minimum low as paired bars, with the spring/neap pulse plain to see ◆ 12-month envelope: a smoothed year-at-a-glance view of the highs and lows around your spot ◆ Top-5 tide rankings: see the biggest highs and deepest lows in any visible window ◆ Sunrise, sunset, moon phase, and your nearest station's name at a glance ◆ Mechanical-drum readout for time and water level, with selection haptics as you scrub ◆ Apple Watch standalone — runs without iPhone, same instrument feel on the wrist PRIVACY ◆ Location is read only on device to find your nearest tide station — nothing is transmitted, stored, or shared ◆ No accounts, no analytics, no ads, no tracking DATA Tide harmonics derived from the open OpenWaters database (NOAA + TICON-4). Predictions are sub-hour accurate at most reference stations. Subordinate stations rely on time and height offsets from a parent station. RECREATIONAL USE ONLY. Not for marine navigation. Always consult official hydrographic publications for safety-critical decisions.

TideCheck gives you fast, accurate tide predictions for 20,112 coastal stations across 204 countries — calculated with harmonic analysis, the same proven method used by hydrographic agencies worldwide. Whether you fish, surf, boat, dive, or just love the coast, TideCheck shows what the tide is doing right now and what's coming next. FEATURES • Nearest station automatically — tides for the closest station to you • Search 20,000+ stations by name, region, or place • Clear tide chart for any day, with high/low times and heights • Live next-tide countdown and a rising/falling gauge • Solunar fishing times — major & minor feeding periods with a daily rating • Sunrise, sunset, and moon phase • Tide alerts — get notified before each high or low tide at your saved stations • Save favorite stations for quick access • Works offline — your saved tides are cached • Switch between LAT, MLLW, and MSL datums (international & US standards) • Choose meters or feet Predictions use harmonic constituent analysis from NOAA, TICON-4, and FES2022. IMPORTANT Tide predictions are for informational purposes only and are not suitable for navigation. Always consult official nautical charts for safety-critical decisions. TideCheck is free and supported by ads. — Privacy Policy: https://tidecheck.com/privacy Terms of Service: https://tidecheck.com/terms Web & developer API: https://tidecheck.com