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