Compare software

OpenSpec vs Spec Kit: catalog facts
OpenSpec	Spec Kit
Free Free and open source under the MIT license.	Free Free and open source from GitHub.
Command line	Command line
Stores specifications as plain Markdown Includes proposal, implementation, and verification steps	Structured spec-first workflow for AI agents Works with several coding agents through integrations
Requires Node.js 20.19.0 or higher.	Adds process overhead for small changes Still requires a separate AI coding agent
Downloadable app	Downloadable app
Open source	Open source
License: MIT	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 8, 2026	Official website Full listing and sources Checked October 2, 2026

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