Compare software

Trelby vs Celtx: catalog facts
Trelby	Celtx
Free Free software under the GPL.	Freemium Free account available, with a 7-day trial of paid features.
Linux	Web
Enforces correct screenplay formatting and pagination Imports and exports Final Draft and Fountain files	Script editors for many formats, including theater and games Storyboard and beat sheet tools
Interface built with wxPython looks dated next to commercial tools No collaboration or cloud sync features mentioned	Many features sit behind paid plans Requires an account
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.