Slackwater — Tides & Current
Slack water times, offline
About
Access tide and current data for thousands of stations worldwide, even without an internet connection. View predictions for rising/falling tides, slack times, and current speeds and directions. Includes sunrise, sunset, and moon phase information.
What's New in Slackwater
1.0
October 13, 2026
FAQ
Does Slackwater have ads?
No, Slackwater is completely ad-free. The app explicitly states 'no ads' and is open source.
What is the pricing for Slackwater?
The core functionality of Slackwater is free for all stations and dates. Optional premium features are available via a yearly subscription or a one-time lifetime purchase.
What devices does Slackwater support?
Slackwater is available on iPhone, iPad, and Apple Watch, offering a seamless experience across your Apple devices.
How often is Slackwater updated?
The app was last updated on 2026-10-13 with version 1.0, indicating recent development and ongoing support.
Can I use Slackwater for navigation?
No, Slackwater is not for navigation. Predictions are based on models and can vary with weather and river flow; it is intended for planning and information purposes.
What sources does Slackwater use for its data?
Slackwater uses data from NOAA, the Canadian Hydrographic Service, Norway's Kartverket, and the TICON-4 global tide-gauge catalogue, ensuring reliable information.
What are the premium features in Slackwater?
Slackwater Premium offers lock screen widgets, Apple Watch complications, alerts for important tides and currents, and station calendars.
What is the age rating for Slackwater?
Slackwater has an age rating of 4+, making it suitable for a wide range of users.
