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GWeatherRouting vs PredictWind: catalog facts
GWeatherRouting	PredictWind

Best for: Sailors planning coastal or offshore routes with weather forecasts	Best for: Sailors planning passages around wind and weather
Free Free and open source under GPL-3.0-or-later.	Free + paid options Some forecasts are free; routing and advanced features need a paid plan.
Windows, Linux	Web
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	High-resolution wind forecasts Weather routing and departure planning together Aimed specifically at sailing and ocean racing
The listed downloads are for Linux and Windows	Advanced features are paid Proprietary hosted service
Downloadable app	Web application, Hosted service
Open source	Not open source
License: GPL-3.0-or-later	License not stated
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 GWeatherRouting gweatherrouting.org Catalog checked October 8, 2026	Official website Full listing and sources Sources for PredictWind predictwind.com Catalog checked September 24, 2026

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