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Celtx vs Trelby: catalog facts
Celtx	Trelby
Freemium Free account available, with a 7-day trial of paid features.	Free Free software under the GPL.
Web	Linux
Script editors for many formats, including theater and games Storyboard and beat sheet tools	Enforces correct screenplay formatting and pagination Imports and exports Final Draft and Fountain files
Many features sit behind paid plans Requires an account	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.