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Celtx vs Story Architect (STARC): catalog facts
Celtx	Story Architect (STARC)
Freemium Free account available, with a 7-day trial of paid features.	Freemium A free version with unlimited projects is available, and some features are reserved for…
Web	Windows, macOS, Linux, iOS
Script editors for many formats, including theater and games Storyboard and beat sheet tools	TV series with all episodes kept in one project Screenplays, comics, plays and books share one story bible
Many features sit behind paid plans Requires an account	Proprietary licence on Linux builds AI assistant relies on ChatGPT technology
Web application	Downloadable app
Closed source	Closed source
License not stated	License: Proprietary
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 1, 2026

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