Amphidrome: Tide Almanac

Offline Tides & Currents

Purpose-Built

Amphidrome is a harmonic tide and current almanac that does its math entirely on your device. Every prediction is computed from bundled tidal harmonic constituents — the same physics professional almanacs use — so it works exactly where cell service dies: a back-bay cove, an offshore bank, a canyon river mouth, or airplane mode.

Core Tools

Offline Tides & Currents
Private on-device workflow
No account or subscription

Private by Design

No account, ads, tracking, third-party analytics, or developer-operated backend. Your work stays on your device unless you deliberately share or export it.

Use It Responsibly

Predictions are planning aids and are not approved for navigation or emergency decisions. Use official local tide and current information when safety matters.