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FreeOffice vs Letters: catalog facts
FreeOffice	Letters
Free Free for personal and business use.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	Linux
Free for personal and business use Compatible with Word, Excel and PowerPoint files	Designed to fit the GNOME desktop Available as a Flatpak from Flathub
Closed source Mobile apps are part of the paid SoftMaker Office	Very new project, started in 2026 Linux only
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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