Slackwater: Tides & Weather

Know the water before you go.

Slackwater gives you real-time tides, slack windows, wind, radar, forecasts, and fishing times for 3,600+ NOAA tide stations, from Florida to Alaska to the islands, in one fast, clean app. Whether you're wading a flat at first light, running the bay, or watching the tide from the pier, Slackwater shows what the water's doing now and what it'll do next.

TIDES & SLACK • Live water level beside the prediction, so a wind tide is obvious at a glance • High and low times — and the slack window around each one, when the water actually goes slow and for how long • Tide curves: the day at a glance, two days of history behind you, a month ahead • Every NOAA station, with observed water wherever a gauge reports it • Find any station by name, or the nearest with one tap

WEATHER & WIND • Current wind, gusts and direction, plus the next 12 hours • Hourly temperature, rain chance and wind for the next 24 hours • Barometric pressure and trend, air temp, water temp, and a 24-hour water temp trend • Sea state — wave height, swell and wind wave, with direction and period • Animated wind layer, plus radar you can scrub 2 hours back or 12 hours ahead • Marine advisories and warnings for your water, on the map and on the station

FISHING & PLANNING • Solunar times — major and minor, with a rating for every day • A 30-day calendar: tides, sun and moon, weather and fishing rating, day by day • Sunrise, sunset, moonrise, moonset and moon phase • Save your spots — each one shows its level, next turn, slack window and curve

WIDGETS & LOCK SCREEN • Four widgets — Tide Now, Station Board, Window and Day Board — each set to whichever station you want • Widgets draw the measured water over the prediction, so the difference reads at a glance • Tide Now fits the Lock Screen too • Live Activity: follow a station's level, direction and countdown to the turn on the Lock Screen and in the Dynamic Island • Start it from the station page, Control Center, or a Shortcut

ALERTS • Tide alerts that arrive ahead of the slack window, not just the turn • Solunar alerts, a morning brief, and optional marine advisories • Alerts can carry a picture of the day's tide curve • Scheduled entirely on your device, with quiet hours

PRIVATE BY DESIGN • No ads. No tracking. No account. • Your location never leaves your device.

Built for iPhone and iPad.

SLACKWATER PRO Try everything free for 7 days, then keep it for $4.99/year — one low yearly price, no ads, and it helps keep the tide servers running. Prefer the web? slackwater.app is always free.

• Slackwater Pro — $4.99 per year, with a 7-day free trial • Payment is charged to your Apple ID at the end of the free trial • Auto-renews yearly unless turned off at least 24 hours before the period ends; manage or cancel anytime in your Apple ID settings

Tides and weather are for planning and recreation, not navigation or safety-of-life decisions. Always check official sources before heading out.

Data from NOAA, the National Weather Service, and the U.S. Naval Observatory, radar via RainViewer, forecast radar from NOAA's HRRR model, forecast grids from Open-Meteo.

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