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Trelby vs Arc Studio: catalog facts
Trelby	Arc Studio
Free Free software under the GPL.	Freemium Free to start without a credit card, with a paid Pro tier.
Linux	Web
Enforces correct screenplay formatting and pagination Imports and exports Final Draft and Fountain files	Whiteboard outlining with story beat cards Outline and notes shown beside the script
Interface built with wxPython looks dated next to commercial tools No collaboration or cloud sync features mentioned	Advanced features require a paid plan Requires an account
Downloadable app	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.