High-resolution tides, one API call away.

Predict the tide at any coordinate, for any moment in the past or future — synthesized from the full 34-constituent FES2022 model on a 3.7 km grid.

Start free — 1,000 calls See how it works

constituents

3.7 km

native grid

∞

time horizon

~23M

ocean points

THE METHOD

Harmonic constants in. Tide height out.

We store the harmonic constants of the FES2022 model once per grid point, then synthesize the tide on demand. No precomputed tables, no fixed forecast window — just the physics, evaluated for the exact time you ask for.

01 · grid

34 constituents, mapped

Amplitude and phase for every tidal constituent, stored at the model's native 1/30° resolution across ~23M ocean points.

02 · synthesize

Any instant, on the GPU

We sum the constituents with proper nodal corrections to get the height at any timestamp — past or future — in milliseconds.

03 · deliver

Heights, extremes, current

A simple REST response: the height series, the high/low events, or the current level and next turn — with the grid point we used.

TRANSPARENCY

We tell you exactly what you're getting.

Most tide APIs hide their resolution and constituent set. Mareel publishes them — and returns the grid point that served your request.

	Mareel	WorldTides	TidesAtlas
Published resolution	3.7 km (1/30°)	Not disclosed	~7 km
FES2022 constituents	All 34	Not disclosed	8 (major)
Time horizon	Any date, past or future	Windowed	Windowed
Grid point returned	Yes, with distance	No	Nearest station
Entry price	$15/mo (Pro)	Credits	$39/mo (Pro)

48.383°N · 4.495°W — BREST

Real shape, real response.

48 hours of tide height

curl "https://api.mareel.example/v1/tides/extremes\
  ?lat=48.383&lon=-4.495" \
  -H "Authorization: Bearer mk_live_…"

{
  "location": { "lat": 48.383, "lon": -4.495 },
  "grid": { "lat": 48.383, "lon": -4.5, "distance_km": 0.4 },
  "extremes": [
    { "time": "2026-06-21T03:12:00+00:00", "type": "LOW",  "height_m": 0.74 },
    { "time": "2026-06-21T09:28:00+00:00", "type": "HIGH", "height_m": 6.91 }
  ],
  "meta": { "model": "FES2022", "datum": "MSL" }
}

TRY IT — CLICK ANY COASTLINE

Tides for any point on Earth, live.

This map calls the real Mareel API. Click a coastline and watch the tide curve synthesize from the global grid in milliseconds — the same data your integration gets.

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PRICING