Source: https://seerepo.com/compare/Fission-AI/OpenSpec/vs/NousResearch/hermes-agent
Markdown source: https://seerepo.com/compare/Fission-AI/OpenSpec/vs/NousResearch/hermes-agent.md
Description: OpenSpec and hermes-agent share 3 technologies: Tailwind CSS, yaml, and Zod. OpenSpec is written in TypeScript and hermes-agent in Python.

# OpenSpec vs hermes-agent

OpenSpec and hermes-agent share 3 technologies: Tailwind CSS, yaml, and Zod. OpenSpec is written in TypeScript and hermes-agent in Python.

- [Fission-AI/OpenSpec](https://seerepo.com/r/Fission-AI/OpenSpec): Spec-driven development (SDD) for AI coding assistants.
- [NousResearch/hermes-agent](https://seerepo.com/r/NousResearch/hermes-agent): The agent that grows with you

## What they share and what sets them apart

- In common: Tailwind CSS, yaml, Zod
- Only in OpenSpec: Inquirer, ora
- Only in hermes-agent: React, FastAPI, Vite, Tauri, Tokio, @tauri-apps/api, React Router, Electron, Rich, jinja2, openpyxl, class-variance-authority, tailwind-merge, Radix UI, Lucide, tracing, tracing-subscriber, xterm, dnd-kit, motion, @tanstack/react-virtual, D3, cmdk, CodeMirror, react-dnd-html5-backend, use-stick-to-bottom, @icons-pack/react-simple-icons, streamdown, dompurify, katex, qrcode, shiki, js-yaml, remark-math, unified

## Side by side

| | OpenSpec | hermes-agent |
|---|---|---|
| Size | 144,693 lines written, 218 code files | 3,858,936 lines written, 5,274 code files |
| Who writes it | 28.9% of its commits signed by AI. With Claude Code, Codex, CodeRabbit, Cursor, Mistral Vibe, GitHub Copilot, Qwen Code, and Crush | 2.2% of its commits signed by AI. With Claude Code, Cursor, Codex, GitHub Copilot, Devin, OpenHands, Factory, Jules, and Crush |
| Activity | Last push November 4, 2026, 967 commits, 73,952 stars | Last push November 4, 2026, 58,269 commits, 260,334 stars |
| Tests | 245 test files. 74.3% of its code files have a test that imports them | 10,042 test files. 65.7% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, OpenSpec or hermes-agent?

hermes-agent, with 3,858,936 lines written; OpenSpec has 144,693.

The proof: [NousResearch/hermes-agent's code at commit 71736c9](https://github.com/NousResearch/hermes-agent/tree/71736c9f32597bbca9d89cede5aa136e55946b2f)

### Which has more GitHub stars, OpenSpec or hermes-agent?

hermes-agent, with 260,334 stars; OpenSpec has 73,952.

The proof: [NousResearch/hermes-agent on GitHub](https://github.com/NousResearch/hermes-agent)

### Which has more tests, OpenSpec or hermes-agent?

hermes-agent, with 10,042 test files; OpenSpec has 245.

The proof: [NousResearch/hermes-agent's code at commit 71736c9](https://github.com/NousResearch/hermes-agent/tree/71736c9f32597bbca9d89cede5aa136e55946b2f)

### Which was updated more recently, OpenSpec or hermes-agent?

Both got their last push on November 4, 2026.

The proof: [Fission-AI/OpenSpec's commits on GitHub](https://github.com/Fission-AI/OpenSpec/commits)

### Which has more commits signed by AI, OpenSpec or hermes-agent?

OpenSpec: an AI signed 28.9% of its commits, with Claude Code, Codex, CodeRabbit, Cursor, Mistral Vibe, GitHub Copilot, Qwen Code, and Crush; in hermes-agent, 2.2%.

The proof: [the commits each tool signed in Fission-AI/OpenSpec](https://seerepo.com/r/Fission-AI/OpenSpec/ai)

## Sources

- Fission-AI/OpenSpec: Read on November 5, 2026, at commit 3e4d5f0 (https://github.com/Fission-AI/OpenSpec/tree/3e4d5f0769e2857c8eb54f149cbf5e4f703fa04c)
- NousResearch/hermes-agent: Read on November 4, 2026, at commit 71736c9 (https://github.com/NousResearch/hermes-agent/tree/71736c9f32597bbca9d89cede5aa136e55946b2f)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.