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LibreOffice ViewerMicrosoft 365
Free

Free and open source under the MPL-2.0 licence.

 Freemium

Free web versions are available. Desktop apps require a paid subscription.

Android Windows, macOS, Android, iOS, Web
  • Uses the same document engine as desktop LibreOffice
  • Does not share documents with third parties
  • The reference implementation of the formats everyone else has to match
  • Desktop, web and mobile apps with real-time co-authoring
  • Simplified compared with the desktop suite
  • Focused on viewing rather than full editing
  • Subscription pricing, with the desktop apps behind it
  • Closed source, and heavily tied to a Microsoft account
Downloadable app Downloadable app, Hosted service
Open source Closed source
License: MPL-2.0 License not stated
Not stated if an account is needed Account needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 22, 2026

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