What Tide It refuses to do.

Most apps describe themselves by what they add. This one is better described by what it turns down — because that is where the trust you can place in it at the water's edge is actually decided.

No advertising. No account. No tracking.

There is no banner to dismiss, no video to sit through, no sign-up screen before your first tide. Tide It opens and works.

This is not only about comfort. An app funded by advertising has an interest in bringing you back often and keeping you there. A tide app should give you the answer and let you go to the water. The two models cannot live in the same screen. The full detail is in the privacy policy — it is short, and that is deliberate.

Tides are computed inside your iPhone, not downloaded.

Tide It ships with a harmonic prediction engine: from a port's constants it recomputes the curve locally, hour by hour. French ports trigger no network request at all for their tides, and everywhere else the on-device computation runs first — the network is only a fallback when constants are missing.

Three concrete consequences: it works in a cove with no signal, it costs almost nothing in battery, and today's curve is continuous with next week's, since both come out of the same computation. Many apps show a visible seam between the two: they change source halfway through.

Measured wind beside the forecast — never instead of it.

A forecast says what the wind will do. An anemometer says what it is doing. Tide It shows both, separately, with the age of the reading always visible — and never blends one into the other.

That is a deliberate refusal: "correcting" a forecast with a reading from a sheltered station would drag down the forecast for an exposed spot, and a station that failed yesterday would keep distorting seven days of forecast with its last samples. The job of the real measurement is to confirm the present moment. Not to rewrite the future. The detail is here →

When data is missing, the app shows nothing.

No zero, no dash, no interpolated value to fill the gap. If no usable station is close enough, the "real wind" line disappears. If swell is unknown, it does not quietly become "0.0 m — flat".

It sounds like a detail, right up to the day a default "0 km/h" has you rigging the big kite. An empty field is information; an invented zero is a lie that looks like a measurement.

On Apple Watch, in widgets, and in 12 languages.

A standalone Apple Watch app, complications on the face, widgets on the home and lock screens: tide and wind without taking the phone out of your jacket.

And the whole app is translated into twelve languages — French, English, German, Spanish, Italian, Dutch, Portuguese, Simplified and Traditional Chinese, Japanese, Korean, Hindi.

One setting per sport, not one average setting.

A 75 kg kitesurfer on a 9 m, a beginner wingfoiler and a surfer are not looking for the same window in the same week. Tide It keeps a minimum wind, a maximum wind and a skill level per sport, and works out the slots that concern you — kitesurf, wingfoil, windsurf, sailing, surf, SUP, fishing.

3,500+ ports and 284 surf spots ship with the app, and if yours is missing you create a custom spot at your exact position.

What Tide It does not replace.

It is a decision aid for recreational water sports. It is neither a navigation instrument nor an official bulletin, and no forecast replaces a look at the water before you go.