Slackwater — Tides & Current
13 days old
Slackwater — Tides & Current is #49 in Weather Free in Canada and charting in 1 of 30 countries we track.
Updated 25 Oct 2026 · rankings refresh through the day
DeveloperOpen Water Software LLC
CategoryWeather
PriceFree
Released
Rating★ 5.0 (3)
Version1.0
Age rating4+
First seen by us
16 Oct 2026
16 Oct 2026Rating
5.0 ★
3 ratings
Measured
Best rank now
#49
Weather FreeMeasured
Slackwater — Tides & Current on the App Store
App details
App ID
6813654837
Publisher
Open Water Software LLC
On the store since
Oct 2026
Under a year
Minimum OS
iOS 26.0+
iPhone 11 and later
Devices
iPhone · iPad · Watch
Universal purchase
Content rating
4+
Languages
13
DA NL EN FI FR DE IT JA KO NB PT ES …
Size
56 MB
Also listed in
Navigation
Where Slackwater — Tides & Current's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Canada | WeatherFree | #49 |
Apps near Slackwater — Tides & Current on the chart
Weather Free, around #49.
Ratings
App Store, worldwide.
Rating
5.0 ★
3 ratings
Measured
Ratings
3
Measured
About Slackwater — Tides & Current
The tide and currents app that works without signal. Tides for more than 4,700 stations worldwide and currents across the US and Canada, already on your phone — on the water, on the beach, in the anchorage, with no bars and nothing to load.
No spinner. No "no internet connection". You open it, and the answer is there: rising or falling, flooding or ebbing, and how long until the next high, low or slack.
And it does the part most tide apps skip. Heights are the easy half. The harder question is the current: when does the pass go slack? How hard is it running at max? Can you get through before it turns?
WORKS WHERE THERE IS NO SIGNAL
Predictions are made on your phone, not fetched. Down a dead-end road, out at the point, in an anchorage, or with the boat's electronics down — you get the same answer you would have got at the dock. The map for your area and your favourite stations stays on your phone too.
CURRENTS, NOT JUST TIDES
Slack, max flood and max ebb on one curve, with speed and direction. Drag your thumb across the week to read any moment. Every current station links to the tide at its reference port.
SUN, MOON AND THE TIDES THEY DRIVE
Sunrise, sunset and twilight, the moon's phase, spring and neap tides explained, and solar and lunar eclipses, for every station.
ON YOUR WRIST, HOME SCREEN AND SIRI
An Apple Watch app that works without your phone: turn the Digital Crown to scrub the day. Home screen widgets for the next event and today's curve. Ask Siri for the next low tide, high tide or slack window. On iPhone and iPad, in 14 languages.
FREE, NO ACCOUNT, NO ADS
Every station and every date is free and stays free. No account, no ads, no tracking, and the app is open source.
Slackwater Premium is optional and funds development: lock screen widgets, Apple Watch complications, alerts before the tides and currents you care about, and station calendars. Choose a yearly subscription or a one-time lifetime purchase.
WHERE THE NUMBERS COME FROM
Tides for more than 4,700 stations across a hundred countries are built in, from NOAA, the Canadian Hydrographic Service, Norway's Kartverket and the TICON-4 global tide-gauge catalogue, and checked against each station's published tidal datums wherever it has them. Currents cover the United States and Canada: more than 2,500 NOAA current stations, plus 22 Canadian passes from the Salish Sea to Haida Gwaii and Cape Breton. Canadian stations download their data from the Canadian Hydrographic Service once, then work offline. A few Canadian passes sit in water the on-device model cannot predict; those fetch predictions when you are online, and say so. Where we cannot publish numbers we trust, the station is listed but blank instead of guessed.
Predictions are not observations — conditions vary with weather and river flow. Not for navigation.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://slackwater.xyz/privacy/
No spinner. No "no internet connection". You open it, and the answer is there: rising or falling, flooding or ebbing, and how long until the next high, low or slack.
And it does the part most tide apps skip. Heights are the easy half. The harder question is the current: when does the pass go slack? How hard is it running at max? Can you get through before it turns?
WORKS WHERE THERE IS NO SIGNAL
Predictions are made on your phone, not fetched. Down a dead-end road, out at the point, in an anchorage, or with the boat's electronics down — you get the same answer you would have got at the dock. The map for your area and your favourite stations stays on your phone too.
CURRENTS, NOT JUST TIDES
Slack, max flood and max ebb on one curve, with speed and direction. Drag your thumb across the week to read any moment. Every current station links to the tide at its reference port.
SUN, MOON AND THE TIDES THEY DRIVE
Sunrise, sunset and twilight, the moon's phase, spring and neap tides explained, and solar and lunar eclipses, for every station.
ON YOUR WRIST, HOME SCREEN AND SIRI
An Apple Watch app that works without your phone: turn the Digital Crown to scrub the day. Home screen widgets for the next event and today's curve. Ask Siri for the next low tide, high tide or slack window. On iPhone and iPad, in 14 languages.
FREE, NO ACCOUNT, NO ADS
Every station and every date is free and stays free. No account, no ads, no tracking, and the app is open source.
Slackwater Premium is optional and funds development: lock screen widgets, Apple Watch complications, alerts before the tides and currents you care about, and station calendars. Choose a yearly subscription or a one-time lifetime purchase.
WHERE THE NUMBERS COME FROM
Tides for more than 4,700 stations across a hundred countries are built in, from NOAA, the Canadian Hydrographic Service, Norway's Kartverket and the TICON-4 global tide-gauge catalogue, and checked against each station's published tidal datums wherever it has them. Currents cover the United States and Canada: more than 2,500 NOAA current stations, plus 22 Canadian passes from the Salish Sea to Haida Gwaii and Cape Breton. Canadian stations download their data from the Canadian Hydrographic Service once, then work offline. A few Canadian passes sit in water the on-device model cannot predict; those fetch predictions when you are online, and say so. Where we cannot publish numbers we trust, the station is listed but blank instead of guessed.
Predictions are not observations — conditions vary with weather and river flow. Not for navigation.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://slackwater.xyz/privacy/
Latest updates
1.0