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Slugline vs WriterDuet: catalog facts
Slugline	WriterDuet
Freemium Free up to six pages per script; longer scripts need the Unlimited Writing upgrade.	Freemium A free tier is available, with paid plans for more features.
macOS, iOS	Web
Automatic screenplay formatting as you type Drag-and-drop outline that moves the matching script text	Real-time co-writing on the same script Covers planning, writing and sharing a script
Apple platforms only Scripts longer than six pages require a paid upgrade	Proprietary software Mainly useful for scripts rather than general writing
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.