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Xodo vs Orion Viewer: catalog facts
Xodo	Orion Viewer
Freemium Reading and annotation are free. Editing and conversion quotas require a paid plan.	Free Free and open source under the GPL.
Windows, Android, iOS, Web	Android
The same annotation and signing tools on web, desktop and mobile Works directly against Google Drive, Dropbox and OneDrive	Opens DjVu as well as PDF, XPS, CBZ and TIFF Configurable tap zones and key bindings for page turning
Conversion and advanced editing are limited without a paid plan Closed source, and online tools process files on their servers	Viewer only, with no PDF editing Interface is functional rather than polished
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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