Compare software

OpenTopoMap Viewer vs Guru Maps: catalog facts
OpenTopoMap Viewer	Guru Maps
Free Free and open source under the Apache 2.0 licence.	Freemium Free to use, with Pro available as a subscription or a lifetime purchase.
Android	Android, iOS
Topographic maps with contour detail GPX import and display	Offline turn-by-turn navigation and search 3D terrain, hillshading and contour lines
Online client that needs a connection for new areas Android only	Some features require the paid Pro tier Closed source
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.