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