Support
Darker Tides shows New Zealand tide times on your iPhone Home Screen, with a tide curve and a timetable for 88 ports around Aotearoa. Tide predictions come from Toitū Te Whenua Land Information New Zealand (LINZ). The app works offline and collects no data.
Contact
Questions, bug reports, or a port you’d like added? Email hello@aspatial.studio, or use Settings › Contact in the app, and we’ll get back to you, usually within a few days.
Where does the tide data come from?
Predictions are sourced from Toitū Te Whenua Land Information New Zealand (LINZ) and licensed under Creative Commons Attribution 4.0 (CC BY 4.0). The attribution is shown inside the app.
How accurate are the predictions?
Tide heights and times are official LINZ predictions, computed on your device. As with all tide predictions, actual water levels can be affected by weather, barometric pressure, and local conditions. Always rely on official sources for navigation and any safety-critical decisions.
Does the app work offline?
Yes. All tide data is bundled with the app, so tide times, the widgets and tide alerts all work with no internet connection, and nothing about you is sent anywhere. The one part that needs a connection is the port map, which shows Apple Maps; you can always choose a port from the list instead.
Which places are covered?
88 ports from Northland to Stewart Island, including the Chatham Islands. Use the searchable, region-grouped picker to choose your port; recent ports stay at the top for quick access.
Why am I seeing an “out of date” notice?
The bundled predictions currently run through 2028. As that date approaches, the app shows a notice. We release updates with refreshed data, so keeping the app up to date in the App Store keeps your tides current.
Which units does it use?
The ones your iPhone uses, unless you pick others in Settings › General › Units: Metric (tide heights in metres, distances in kilometres), UK (tide heights in metres, distances in miles) or US (tide heights in feet, distances in miles).
Is Darker Tides free?
Darker Tides is free to download. Tide times in the app are free for every port, for good. The widgets, tide alerts and Lock Screen tide are free for 14 days, and after that a one-time purchase of NZ$4.99 (the App Store shows your local price). There’s no subscription. Start the free trial from Settings › Purchase or Settings › Alerts, or by tapping a widget.
I bought Darker Tides before it was free. Do I have to pay again?
No. If you bought Darker Tides when it cost NZ$4.99 up front (any version before 2.2), it’s yours, all of it, on any iPhone signed in with the Apple ID you bought it with. There’s no trial and nothing to buy, and the app won’t ask.
What happens when the trial ends?
The widgets say the trial has ended, tide alerts stop, and the Lock Screen tide goes. Tide times in the app never stop. Tap a widget, or open Settings › Purchase, to buy Darker Tides and bring them back.
How do I restore my purchase?
Usually there’s nothing to do: the purchase belongs to your Apple ID and comes back by itself on any iPhone signed in with it. If it doesn’t, open Settings › Purchase, tap Try Darker Tides Free or Buy Darker Tides, and choose Restore Purchases on the sheet. Deleting the app doesn’t start the trial again.
Does Darker Tides collect my data?
No. The app has no account, no analytics, no advertising, and no tracking. Your selected port and settings are stored only on your device. See the Privacy Policy for the full details.