# Slackwater Premium

Keep your next tide close at hand. Check it from your lock screen, get a reminder before low water, or put a slack window beside your plans.

One Premium, with every feature. Choose a lower yearly price or pay once for lifetime access.

[See payment options](/pricing/#payment)

## A glance before you go

Put tides and currents on your lock screen, with the next high, low or slack right there when you pick up your phone. Apple Watch complications bring that glance to your wrist too.

![Slackwater's lock-screen widget examples showing Port Townsend's tide curve, a 3.1-foot height and an 8:15 AM low tide.](/shots/premium/lock-screen.webp)

## Let Slackwater remind you

Set an alert before the tide or current event you care about. Choose how far ahead to be reminded and let Slackwater watch the time.

![Slackwater's alert example for Port Townsend's low tide at 8:15 AM, with a reminder before you go.](/shots/premium/alert.webp)

## Put the tide beside your plans

Add a calendar for a favorite place. See its high and low tides or slack-water events alongside the rest of your schedule, so planning a day out starts with the water.

![Slackwater's calendar example showing Port Townsend's low tide on September 8 at 8:15 AM.](/shots/premium/calendar.webp)

## One Premium. Two ways to pay.

Both options include the **same Premium features** and **future Premium improvements**. These prices stay the same as Premium grows.

| Yearly subscription | Lifetime purchase |
| --- | --- |
| **US$7.99 per year** | **US$69.99 once** |
| Lower upfront price. Paid each year. | One larger payment. No subscription. |
| Premium access while your subscription is active. | Premium access for life. |

The yearly subscription renews automatically until you cancel. Manage or cancel it in your Apple account's subscription settings. The lifetime purchase is a single payment, with no renewal.

[Get Slackwater on the App Store](https://apps.apple.com/app/slackwater-tides-current/id6813654837)

Already have the app? Open Settings and choose **Support Slackwater** to get Premium. If you already own it, use Restore purchase with the Apple account that bought it.

## The free app stays free

Tide charts, tidal current predictions, station search, favorites, home screen widgets and the Apple Watch app are free. Every prediction date is available without a subscription. Premium supports Slackwater's development and adds the features above.

Bundled stations work offline. Supported Canadian stations need an initial download; some passes require a connection and are labeled in the app. [Browse the station directory](/stations/) to check your destination.

## Purchase details

Prices above are in US dollars for the US App Store, verified against [Slackwater's listing](https://apps.apple.com/us/app/slackwater-tides-current/id6813654837) on October 15, 2026. Apple shows your local currency and the price for your storefront before you confirm a purchase.

Slackwater requires iOS or iPadOS 26 or later, or watchOS 26 or later on Apple Watch. Predictions are not observations. **Not for navigation.**

For purchase questions, [contact support](/contact/). Read the [privacy policy](/privacy/) and [Apple's standard Terms of Use](https://www.apple.com/legal/internet-services/itunes/dev/stdeula/).