Tide 4a

Put it on and go to the water. No accounts, no API keys, no setup. Tide 4a is a clean, readable watch face built for people who live by the tide: sailors, surfers, kayakers, anglers. Tide graph that works offline, worldwide. Predictions are computed on the watch from harmonic constants of the nearest tide gauge (2,400+ coastal stations worldwide, TICON-4/GESLA-4 dataset). After one background sync per location, the tide keeps running with no phone at all — for weeks. Verified against published tide tables to within minutes. Next high & low water with times and heights (meters or feet), plus an amber countdown to the next event. Weather forecast (MET Norway model): 5 slots with temperature, wind speed and direction, condition icons. Wind color-coded by strength. Barometer fallback: away from the sea you get a 10-hour pressure graph with trend and storm alert instead of an empty tide block. Sunrise/sunset, moon phase (mirrored correctly in the southern hemisphere), heart rate, steps, battery in days, solar intensity on solar models. AMOLED: full-color gradients, glow, always-on display with burn-in protection. MIP: crisp 64-color layout. 12/24h clock, °C/°F, m/ft, mmHg/hPa, m/s/knots. English, Russian, French, Spanish. No configuration is required: the watch face picks the best tide source automatically — built-in stations, nearest world tide gauge, or online extremes. Requires a phone paired with the Garmin Connect app for weather and tide updates; once synced, tide prediction keeps working with no phone. Tide 4a is free with all features. If you enjoy it, you can support development: https://boosty.to/tide4a Tide predictions are for general information only — not for navigation or dive planning. Tide constants: TICON-4 (DGFI-TUM, CC-BY-4.0, https://www.seanoe.org/data/00980/109129/). Weather: MET Norway (api.met.no, NLOD/CC-BY-4.0) and Open-Meteo. Location coordinates are sent only to the developer's proxy to fetch weather and tide data; nothing is stored. Privacy policy: https://tide-weather.kripsadin.workers.dev/privacy