Krona Tidewater: Surf Ring

Krona Tidewater draws the sea at your spot as a 24-hour ring: in the app, in the Wear OS app and on a watch face.

THE VERDICT
A custom conditions verdict for your spot, 24 hours ahead. Every hour scored from No-go to Excellent by your own preferences: swell height, swell period, wind, tide height, water and air temperature, swell and wind directions, gust tolerance, hard limits. Weighted by what matters for your sport: surfing, kitesurfing, windsurfing, sailing, paddling / SUP or swimming. Presets for every sport included.

THREE PAGES
• Tide & verdict: tide curve with high and low water
• Wind & waves: wave height colored by swell period, onshore/offshore arrows
• Shore weather: temperature, UV and rain at the break
Drag along the ring to read any moment. A 3-day chart under each page. 24-hour or 12-hour dial.

WEAR OS
Watch app with the same three rings, crown scrubbing. Watch face with the tide curve and the verdict, installed from the app on Wear OS 6 and newer (older watches: separate free download). Complications: water temperature, next high or low tide, spot, date. Subscribers: the three rings as tiles beside the watch face.

FREE
The whole app at one fixed example spot, Hossegor in France: every page, presets and tuning, the watch app and the face. No time limit. Your own spot: subscription required.

SUBSCRIPTION REQUIRED
• Your own spots: search a beach, break or marina
• Move a spot on the map to its exact position
• Widgets: tide, waves, shore weather — on the phone's home screen and as tiles on the watch
Monthly or yearly, 7-day free trial, cancel anytime in Google Play.

ACCURACY
Weather, wave and tide data can be unreliable. Krona depends on the accuracy of its providers' data: tides from WorldTides, waves, swell and water temperature from Open-Meteo Marine, shore weather from Open-Meteo. The verdict is only as good as its inputs. Forecast data updated every 3 hours. No sea data where no wave model or tide station reaches.

PRIVACY
No account, no ads, no tracking. No background location access. Your position is used only when you tap "Add my current location". Server data tied to one anonymous ID, stored only as a coarse grid cell, deleted after 90 days; deletable at any time via the form the app links to.

ALSO FROM KRONA
Krona Sunlight, a separate app: detailed weather around you, anywhere in the world, as the same ring.
Krona Moonrise, a separate app: the Sun, the Moon, the planets and the satellite passes of the next 24 hours, and whether the clouds will let you see them, as the same ring.

Available in: English, German, Spanish, French, Japanese.