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PredictWind vs GWeatherRouting: catalog facts
PredictWind	GWeatherRouting

Best for: Sailors planning passages around wind and weather	Best for: Sailors planning coastal or offshore routes with weather forecasts
Free + paid options Some forecasts are free; routing and advanced features need a paid plan.	Free Free and open source under GPL-3.0-or-later.
Web	Windows, Linux
High-resolution wind forecasts Weather routing and departure planning together Aimed specifically at sailing and ocean racing	Plans routes using GRIB weather data and boat polar diagrams Imports and exports GPX points and tracks Supports chart formats including GeoJSON, KAP, and GeoTIFF Available for Linux and Windows
Advanced features are paid Proprietary hosted service	The listed downloads are for Linux and Windows
Web application, Hosted service	Downloadable app
Not open source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for PredictWind predictwind.com Catalog checked September 24, 2026	Official website Full listing and sources Sources for GWeatherRouting gweatherrouting.org Catalog checked October 8, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.