TideCheck

TideCheck provides accurate tide predictions for over 6,470 stations across 176 countries, powered by harmonic constituent analysis — the same proven mathematical method used by national hydrographic offices worldwide.

Features include interactive tide charts with 7-day, 15-day, and monthly calendar views, high and low tide times with heights, switchable datums (LAT/MLLW/MSL), sunrise and sunset times, moon phases and illumination, spring and neap tide indicators, solunar fishing forecasts with major and minor feeding windows rated 1-5 stars, current weather conditions including wind, precipitation, and wave height, and an activity guide covering fishing, surfing, snorkeling, beach walking, boating, and photography with weather-aware safety assessments.

Data is sourced from NOAA CO-OPS, TICON-4 (SHOM/SEANOE), and the FES2022 global ocean tide model (AVISO+/CNES). All predictions are calculated in real time on Cloudflare's global edge network for sub-50ms response times.

TideCheck is completely free to use with no account required. A REST API is also available for developers, with a free tier and paid plans for higher usage. The site is mobile-friendly, print-optimized, and works offline when added to your home screen.