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Letters vs ONLYOFFICE Desktop Editors: catalog facts
Letters	ONLYOFFICE Desktop Editors
Free Free and open source under the GPL-3.0-or-later licence.	Free The desktop editors are free and open source under AGPL v3. The company also sells hosted…
Linux	Windows, macOS, Linux
Designed to fit the GNOME desktop Available as a Flatpak from Flathub	High compatibility with DOCX, XLSX and PPTX, the formats most people are sent Text, spreadsheet, presentation, form and PDF editors in one tabbed window
Very new project, started in 2026 Linux only	Fewer advanced features than LibreOffice in areas such as databases and drawing The interface pushes the company’s cloud and enterprise products
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: AGPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 20, 2026

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