Tides
Tide predictions for thousands of stations worldwide, powered by open source software and open data.
Browse Stations
Explore our interactive map to find tide stations near you or search by location.
View station mapDeveloper API
Access tide predictions programmatically through our well-documented API.
View API docsTide Database
Access our comprehensive database of harmonic constituents and station metadata.
Explore databaseNeaps Engine
Learn about the open source tide prediction engine that powers our predictions.
About NeapsUnderstanding Tide Predictions
Tide predictions are calculated using harmonic analysis, a method that breaks down the complex tidal signal into a series of simple wave components called harmonic constituents. Each constituent represents the effect of a specific astronomical or oceanographic force on the tides.
Our predictions are based on harmonic constituents derived from historical tide observations at reference stations, and offsets for subordinate stations that are referenced to nearby primary stations.
Data Sources
Our tide database incorporates data from multiple authoritative sources:
- • NOAA CO-OPS: Harmonic constituents for US coastal stations from the National Oceanic and Atmospheric Administration
- • IHO TICON: International tide constituent database from the International Hydrographic Organization
- • Community Contributions: Additional stations and data contributed by the marine community
Start Exploring Tides
Find tide predictions for your favorite locations or integrate our API into your application.