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OpenTopoMap Viewer vs CoMaps: catalog facts
OpenTopoMap Viewer	CoMaps
Free Free and open source under the Apache 2.0 licence.	Free Free and open source, supported by donations.
Android	Android, iOS
Topographic maps with contour detail GPX import and display	Offline search and turn-by-turn routing for foot, bike and car Outdoor mode with trails, campsites and contour lines
Online client that needs a connection for new areas Android only	Public transport layer covers only some cities Map data quality depends on OpenStreetMap coverage in each area
Downloadable app	Downloadable app
Open source	Open 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.