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Spectra vs Spec Kit: catalog facts
Spectra	Spec Kit
Free Free download for macOS and Windows.	Free Free and open source from GitHub.
Windows, macOS	Command line
Keeps specs and change history in structured files AI tools can read Scoped proposals with tasks and success criteria for each change	Structured spec-first workflow for AI agents Works with several coding agents through integrations
No Linux build listed Useful mainly if you adopt the spec-driven workflow	Adds process overhead for small changes Still requires a separate AI coding agent
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account 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.