Tide predictions at a glance

Works offline, everywhere on the coast

Pick a point on the map once and Shiomi downloads its harmonic constituents. From then on every tide — height, high water, low water — is computed on your device. No signal at the harbour, no problem.

Features

• Offline tide predictions: Harmonic computation runs entirely on device, so the chart is there whether or not you have a connection
• Interactive map: Tap anywhere on Apple Maps, or search a beach, harbour or headland by name
• Detailed tide chart: A two-day curve built with Swift Charts, with high and low water markers, a “now” indicator and sunrise and sunset times
• Moon phase calendar: A month at a glance, with the moon phase and that day’s high and low waters on every date
• Saved locations: Keep as many spots as you like, reorder them, rename them or move them
• Widgets: The current tide and the next high or low water on your Home Screen, Lock Screen and Mac desktop
• Apple Watch app: Today’s tide on your wrist, computed offline just like on the phone
• Syncs with iCloud: Your locations and settings follow you across your Apple devices

Perfect for

• Fishing trips planned around the tide
• Surfers looking for the right conditions
• Boating and coastal navigation
• Beachcombing, tide pools and flats
• Photographers timing the water line
• Anyone who loves the ocean

Supported platforms

Native on iPhone, iPad, Mac, Apple Watch and Apple Vision Pro — one app, at home on every screen.

Requires iOS 18, iPadOS 18, macOS 15, watchOS 11 or visionOS 2 and later.