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Trelby vs WriterDuet: catalog facts
Trelby	WriterDuet
Free Free software under the GPL.	Freemium A free tier is available, with paid plans for more features.
Linux	Web
Enforces correct screenplay formatting and pagination Imports and exports Final Draft and Fountain files	Real-time co-writing on the same script Covers planning, writing and sharing a script
Interface built with wxPython looks dated next to commercial tools No collaboration or cloud sync features mentioned	Proprietary software Mainly useful for scripts rather than general writing
Downloadable app	Web application
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	Account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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