Slackwater: Tides & Weather

Slackwater: Tides & Weather

3,600+ NOAA tide stations

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Free
In-App Purchases

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Details

  • Released
  • Updated
  • July 7, 2026
  • September 8, 2026

Features

Slackwater: Tides & Weather screenshot #1 for iPhone
Slackwater: Tides & Weather screenshot #2 for iPhone
Slackwater: Tides & Weather screenshot #3 for iPhone
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Slackwater: Tides & Weather screenshot #5 for iPhone
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About

Get real-time tide and weather information for over 3,600 NOAA stations. Plan your water activities with detailed forecasts, wind data, and fishing times. Save favorite spots for quick checks and utilize home-screen widgets for instant updates.

Real-time tide levels
7-day tide charts
Wind and precipitation forecasts
Solunar fishing times
Sunrise/sunset and moon phase
Home and lock screen widgets
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What's New in Slackwater

2.1

September 8, 2026

The live tide on your Lock Screen. Tap the live button on any station page and Slackwater follows that water for the next eight hours. Slackwater shows the level, which way it's moving, and a countdown to the turn on the Lock Screen and in the Dynamic Island. It's a Control Center button and a Shortcut too, and every tide alert has a "Track on Lock Screen" action. SLACK Texas tides (or any for that matter) don't turn on a dime. The water can sit still for hours across a high, and a countdown to the peak doesn't tell you that. Slackwater now reads those stretches off the curve and says so: "Slack until 6:40 PM, then falling." Slack windows are shaded on every curve, and the arrow next to the level follows the gauge, not the forecast. WIDGETS • The medium widget draws the measured water over the prediction, with the difference beside the level • Day Board (large): the whole day at a glance. Shows tide, measured water so far, night and solunar shading, every turn, sun, moon, wind and water temp • Window (small): the next solunar period, what the tide is doing under it, and when it opens • Every widget can be set to any station. Long-press to pick • Countdowns stay right between refreshes, and everything reads properly in tinted and Lock Screen styles NOTIFICATIONS • Tide alerts name the slack window and arrive ahead of it, not the peak • Solunar alerts say what the tide is doing under the window • Every alert and morning brief carries a picture of the day's curve — long-press to see it • Alerts read cleanly when Siri announces them

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Subscription plans

Slackwater Pro

Unlocks all Slackwater features for one year.

$4.991 Year
7 Days trial
How to cancel Slackwater subscription ⁉️

Developer apps

FAQ

What is Slackwater?

Slackwater is a weather app that provides real-time tide information, wind and precipitation forecasts, and fishing times for over 3,600 NOAA tide stations. It is designed for planning recreational water activities.

Does Slackwater have ads?

No, Slackwater is ad-free. The app is designed with privacy in mind and does not include advertisements or tracking.

How much does Slackwater Pro cost?

Slackwater Pro is available for $4.99 per year and includes a 7-day free trial. This subscription removes ads and supports the app's services.

Can I cancel my Slackwater Pro subscription?

Yes, you can manage or cancel your Slackwater Pro subscription at any time through your Apple ID settings. Auto-renewal can be turned off at least 24 hours before the current period ends.

What devices support Slackwater?

Slackwater is supported on iPhone and iPad devices. It is available for download on the App Store.

How often is Slackwater updated?

Slackwater was last updated on July 16, 2026, with version 1.2. The app receives regular updates to improve functionality and data accuracy.

What data sources does Slackwater use?

Slackwater uses data from NOAA, the National Weather Service, and the U.S. Naval Observatory. Radar data is provided by RainViewer, and forecast grids are from Open-Meteo.

Is Slackwater suitable for navigation?

No, Slackwater is intended for planning and recreation only. Tides and weather information provided are not for navigation or safety-of-life decisions. Always check official sources before heading out.