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Avenza Maps vs CalTopo: catalog facts
Avenza Maps	CalTopo
Freemium Free to use, with paid plans and paid maps for extra features and content.	Freemium Free to use with paid plans for additional features.
Android, iOS	Android, iOS, Web
Works offline with pre-loaded maps Opens georeferenced PDF and GeoTIFF maps	Real-time collaborative editing of the same map Slope angle, snow depth, weather and public land layers
Advanced features require payment Not open source	Many data layers focus on the United States Some features require a paid plan
Downloadable app	Downloadable app, Web application
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.