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

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