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Slugline vs Arc Studio: catalog facts
Slugline	Arc Studio
Freemium Free up to six pages per script; longer scripts need the Unlimited Writing upgrade.	Freemium Free to start without a credit card, with a paid Pro tier.
macOS, iOS	Web
Automatic screenplay formatting as you type Drag-and-drop outline that moves the matching script text	Whiteboard outlining with story beat cards Outline and notes shown beside the script
Apple platforms only Scripts longer than six pages require a paid upgrade	Advanced features require a paid plan Requires an account
Downloadable app	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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.