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Celtx vs WriterDuet: catalog facts
Celtx	WriterDuet
Freemium Free account available, with a 7-day trial of paid features.	Freemium A free tier is available, with paid plans for more features.
Web	Web
Script editors for many formats, including theater and games Storyboard and beat sheet tools	Real-time co-writing on the same script Covers planning, writing and sharing a script
Many features sit behind paid plans Requires an account	Proprietary software Mainly useful for scripts rather than general writing
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.