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OpenTopoMap Viewer vs Locus Map: catalog facts
OpenTopoMap Viewer	Locus Map
Free Free and open source under the Apache 2.0 licence.	Freemium Free to use, with paid features available.
Android	Android, iOS
Topographic maps with contour detail GPX import and display	Offline maps and offline routing Detailed route planner with elevation and surface information
Online client that needs a connection for new areas Android only	iOS gets a Lite version Many options can make it complex for casual users
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0	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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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