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HoudahGeo vs Viking: catalog facts
HoudahGeo	Viking
Paid Paid app with a free trial.	Free Free and open source under the GNU GPL.
macOS	Windows, Linux
Several geotagging methods: GPX tracks, reference photos and maps Writes coordinates into the files themselves	Edits tracks, routes and waypoints in GPX, KML and TCX Shows OSM, Bing Aerial and other map layers
Mac only Paid after the trial	Real-time GPS and Mapnik rendering are not available on Windows GTK interface looks dated on Windows
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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