Compare software

Spec Kit vs OpenSpec: catalog facts
Spec Kit	OpenSpec
Free Free and open source from GitHub.	Free Free and open source under the MIT license.
Command line	Command line
Structured spec-first workflow for AI agents Works with several coding agents through integrations	Stores specifications as plain Markdown Includes proposal, implementation, and verification steps
Adds process overhead for small changes Still requires a separate AI coding agent	Requires Node.js 20.19.0 or higher.
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
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 8, 2026

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