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Story Architect (STARC) vs Slugline: catalog facts
Story Architect (STARC)	Slugline
Freemium A free version with unlimited projects is available, and some features are reserved for…	Freemium Free up to six pages per script; longer scripts need the Unlimited Writing upgrade.
Windows, macOS, Linux, iOS	macOS, iOS
TV series with all episodes kept in one project Screenplays, comics, plays and books share one story bible	Automatic screenplay formatting as you type Drag-and-drop outline that moves the matching script text
Proprietary licence on Linux builds AI assistant relies on ChatGPT technology	Apple platforms only Scripts longer than six pages require a paid upgrade
Downloadable app	Downloadable app
Closed source	Closed source
License: Proprietary	License not stated
Not stated if an account is 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 1, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.