Tideline NZ: Tide & Bite Times

SumnerD

About this app

You're at the ramp at 5am. No signal. Your mate's asking when low tide is. This is exactly what Tideline NZ is for.

Accurate tide predictions for 310+ NZ locations, straight from LINZ, all stored offline on your phone with extra's like map, widgets, bite times, launch window and notifications. For less than the price of a bakery pie. No ads. Not one. Not ever.

OFFLINE. PROPERLY OFFLINE.
A year and more of tide data lives on your phone. The map too, with no tiles downloaded at runtime. Past the Hauraki Gulf. Anchored off the Coromandel. Somewhere in Fiordland with zero bars. Same experience every time.

OPENS RIGHT WHERE YOU LEFT OFF
Your port stays selected. Pin your regulars so they're one tap away, and stop re-picking your spot every time you open the app.

BITE TIMES FOR THE FISHOS
Optional solunar bite times on the tide chart: major and minor feeding
periods from the moon's position, the same theory behind the tables in
the fishing mags. Off by default, one toggle away. A guide, not a promise the snapper agree on.

SET YOUR LAUNCH WINDOW
Tell the app the minimum depth you need. It shows you exactly when the window opens and how long you've got. Filter upcoming tides by launch window. No more guessing.

THE CHART THAT MAKES SENSE
Drag across the tide curve to see the exact height at any moment. Know whether you're heading toward high water or away from it before you commit to that ramp. Bite times, spring and neap lines show you the range context at a glance.

FIND ANY PORT FAST
Search and save your favourite ports, or use your location to find the nearest station, on the map or in the picker.

ONE PRICE. NOTHING ELSE.
No subscription, no in-app purchases, no ads watching you check the tide. Buy it once and it's yours, updates included.

MAP OF EVERY NZ TIDE STATION
See all 310+ tide stations on an offline map. Tap any pin for the next tide at a glance: height, time, countdown, and whether it's rising or falling. Hit "More" for the full picture with sunrise, sunset, and moon phase.

STRAIGHT FROM THE SOURCE
Predictions are calculated from official LINZ data using the standard tide method, and the app quietly refreshes that data whenever you've got signal. So the numbers you're reading are the ones that should be there, not a stale copy from two years ago.

HOME SCREEN WIDGETS
Three styles: a minimal next-tide card, an advanced view with progress ring and current height, and a full daily tide list.

NOTIFICATIONS
Set a reminder before any tide event. Or get a daily evening summary with tomorrow's tides and your launch window. Opt in to king tide and big spring alerts, so the extreme days never sneak up on you.

Built for NZ boaties, surfers, anglers, kayakers, and divers. Kaitaia to Bluff.

View demo: https://www.sumnerd.co.nz/tideline/

PRIVACY
Data does not leave your device and no account is required. Analytics and advertising IDs are not recorded. The app will opportunistically contact sumnerd.co.nz to check for tide data updates from LINZ. That's the only network request it ever makes. Your location is used on-device only to find the nearest tide station. Always happy to improve. Suggest features and report issues to [e-mail]

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Tide data sourced from Land Information New Zealand (LINZ) under CC-BY. Map data © OpenStreetMap contributors, styled by Protomaps. Predictions are not official tide tables as specified in Maritime Rules Part 25. Not for navigation.

What’s new

18th version of Tideline, rework chart and related display logic.