Dimension scores are derived from public data and fields; weighted into the composite. Reference only.
Open Waters is an open-source ocean software and data project initiated by Open Water Software, LLC. Its goal is to help sailors, developers, and ocean enthusiasts build better tools for marine understanding and navigation through open collaboration. The main capabilities highlighted in the current content focus on tide prediction, crowdsourced depth data, and programmable access to ocean data APIs.
The tide functionality is powered by the Neaps engine, with data covering thousands of reference and subordinate stations worldwide. The API can return high/low tide extrema predictions for the nearest station based on latitude and longitude, or provide a water-level timeline at regular time intervals. It also supports querying by station source/id, as well as searching stations by name, ID, coordinates, bbox, and other methods. For depth data, the project says users can collect and share depth measurements from vessels, and offers a Signal K plugin for contributing to the crowdsourced bathymetry project.
The project clearly emphasizes open source tools and data, and its developer APIs are described as free and open source APIs. The current API requires no authentication, returns HTTP status codes and JSON error bodies, and provides an OpenAPI specification. The documentation lists endpoints, parameter locations, types, required fields, and default values, so the basic onboarding information is fairly complete. However, the main content does not mention SDKs, client libraries, code examples, self-hosted deployment instructions, or a versioning policy, so more complex production integrations will still need to be validated independently.
No commercial plans are mentioned in the main content, and the API is currently open and free. The limits are 100 requests per IP per minute and 10,000 requests per day. Production applications that need higher quotas should contact the project team. This makes it friendly for prototypes, research, and small marine tools, but high-concurrency commercial applications should discuss stability, quotas, and support boundaries in advance.
Its strengths are a clearly defined vertical use case, a high degree of openness, a low barrier to integration, and tide station and prediction interfaces that cover common application needs. Its weaknesses are that ecosystem information is still limited, support channels are mainly GitHub and email, and there is no SLA, SDK, self-hosting guidance, or detailed response examples. It is suitable for marine tool developers, ocean data researchers, open-source charting/navigation projects, and teams that want to quickly embed tide prediction capabilities.
The main content does not provide information about access from mainland China, payment, or mirrors, so actual connectivity is unknown. Since the API is currently free, payment methods are not relevant. For production use in China, it is recommended to first test the network stability of api.openwaters.io and evaluate alternatives such as NOAA Tides and Currents API, Stormglass, WorldTides, and Open-Meteo Marine API.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on openwaters.io official site.
openwaters.io is an Unknown API & Data provider. TG4G tracks its product information, an overall rating of 6.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach openwaters.io directly.