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OpenTopoMap vs CalTopo: catalog facts
OpenTopoMap	CalTopo
Free Free to use in the browser.	Freemium Free to use with paid plans for additional features.
Web	Android, iOS, Web
Topographic style with contours from elevation data Based on OpenStreetMap	Real-time collaborative editing of the same map Slope angle, snow depth, weather and public land layers
A map viewer rather than a route planner Site text is partly in German	Many data layers focus on the United States Some features require a paid plan
Web application	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.