Is it free?
Yes. There is no sign-up and no limit on page views. The only thing we ask is that you keep the small link under the widget, because that is how your visitors find the full week and the 30-day calendar.
Where do the times come from?
From the Marine Institute tide predictions, the same ones every page on this site uses. A beach without its own gauge takes the times of the nearest one, and the widget says which gauge and how far away. Weather can push the real level above or below the prediction, so allow a margin.
Does it update by itself?
Yes. New predictions come in every night, and the widget works out today and the time now on the visitor’s own device, so a page left open since yesterday still shows the right day.
Does it set cookies or show ads?
No. The widget has no ads and no Google Analytics, and it sets no cookies, so it does not change what you need in your own cookie notice. The only thing we measure is how many times it loads, with Cloudflare’s cookieless counter.
How big is it?
It fits anything from 300 to 560 pixels wide. With the script version the height adjusts to the content. With the iframe version the height is fixed, and the code already has the right number for the days you picked.
The tide data are the Marine Institute’s predictions under CC BY 4.0, and the widget credits them in its footer. More on the data in how we check.