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WriterDuet vs Celtx: catalog facts
WriterDuet	Celtx
Freemium A free tier is available, with paid plans for more features.	Freemium Free account available, with a 7-day trial of paid features.
Web	Web
Real-time co-writing on the same script Covers planning, writing and sharing a script	Script editors for many formats, including theater and games Storyboard and beat sheet tools
Proprietary software Mainly useful for scripts rather than general writing	Many features sit behind paid plans Requires an account
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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