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CalTopo vs Gaia GPS: catalog facts
CalTopo	Gaia GPS
Freemium Free to use with paid plans for additional features.	Freemium Free version with a paid Premium subscription.
Android, iOS, Web	Android, iOS
Real-time collaborative editing of the same map Slope angle, snow depth, weather and public land layers	Many topographic and satellite map layers Offline map downloads
Many data layers focus on the United States Some features require a paid plan	Advanced features require Premium Proprietary service
Downloadable app, Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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