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RepoClash › Engineering rivals
RepoClash · the open-source arena
spec-kit vs OpenSpec
Engineering rivals. Both tagged engineering, prd, spec. Six rounds of real GitHub data, an AI referee, and the crowd picks a side.
Red corner
VSBlue corner
github/spec-kit: 149,287 stars, Python. 💫 Toolkit to help you get started with SDD or any other process!
Fission-AI/OpenSpec: 74,604 stars, TypeScript. Spec-driven development (SDD) for AI coding assistants.
spec-kit vs OpenSpec: tale of the tape
GitHub data as of November 11, 2026spec-kit has 2.0 times as many GitHub stars as OpenSpec (149,287 vs 74,604). In the last 6 days, spec-kit gained more stars: +1,622 (+1.1%) against +592 (+0.8%) for OpenSpec. spec-kit saw more development in the last 52 weeks with 1,830 commits, against 674 for OpenSpec. OpenSpec is the older project (created August 2025), spec-kit started in August 2025. spec-kit is written mainly in Python, OpenSpec in TypeScript.
| github/spec-kit | Fission-AI/OpenSpec | |
|---|---|---|
| Stars | 149,287 | 74,604 |
| Stars gained, last 6 days | +1,622 | +592 |
| Growth, last 6 days | +1.1% | +0.8% |
| Avg. stars per day since creation | 334 | 161 |
| Forks | 13,406 | 5,108 |
| Commits, last 52 weeks | 1,830 | 674 |
| Open issues | 220 | 203 |
| Best Repocharts rank today | #14 in AI | #41 in AI |
| Language | Python | TypeScript |
| License | MIT | MIT |
| Created | Aug 21, 2025 | Aug 5, 2025 |
| Last push | Nov 10, 2026 | Nov 11, 2026 |
Quick answers
Which is more popular, spec-kit or OpenSpec?
spec-kit has 2.0 times as many GitHub stars as OpenSpec (149,287 vs 74,604) (Repocharts data as of November 11, 2026).
Which is growing faster, spec-kit or OpenSpec?
In the last 6 days, spec-kit gained more stars: +1,622 (+1.1%) against +592 (+0.8%) for OpenSpec.
Which is more actively developed?
spec-kit saw more development in the last 52 weeks with 1,830 commits, against 674 for OpenSpec.
What languages are spec-kit and OpenSpec written in?
spec-kit is written mainly in Python, OpenSpec in TypeScript.
How does RepoClash compare spec-kit and OpenSpec?
RepoClash scores both repositories in six rounds (popularity, momentum, activity, community, maintenance and freshness) from public GitHub data, adds an AI referee's verdict and lets developers vote for their favorite. Star counts are updated daily.
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Pick the next onebuild-your-own-x562k ★awesome535k ★