Compare software

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