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