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Zoho Writer vs Letters: catalog facts
Zoho Writer	Letters
Free Zoho describes Writer as fully free to use.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux, Android, iOS, Web	Linux
Real-time collaboration with change tracking and comments Works with DOCX and PDF files	Designed to fit the GNOME desktop Available as a Flatpak from Flathub
Closed source and tied to Zoho's cloud service AI features run through Zoho's servers	Very new project, started in 2026 Linux only
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
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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