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

# OpenSpec vs dify

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

- [Fission-AI/OpenSpec](https://seerepo.com/r/Fission-AI/OpenSpec): Spec-driven development (SDD) for AI coding assistants.
- [langgenius/dify](https://seerepo.com/r/langgenius/dify): Build Agentic workflows, RAG pipelines, with rich AI model and tool support on one collaborative workspace. Deploy on cloud, VPC, or self-hosted, so teams move from prototype to production without rebuilding the stack.

## What they share and what sets them apart

- In common: Tailwind CSS, yaml, Zod
- Only in OpenSpec: Inquirer, ora
- Only in dify: net/http, Flask, psycopg2-binary, Celery, Redis, Postgres, SQLite, MySQL, Resend, Sentry, werkzeug, Hono, React, Vite, Next.js, pyjwt, langsmith, markdown-it-py, bleach, Pydantic, boto3, js-yaml, Ajv, @hono/node-server, class-variance-authority, cn, Base UI, @xmldom/xmldom, sharp, next-themes, lexical, react-sortablejs, @floating-ui/react, echarts, react-textarea-autosize, @tanstack/react-virtual, @monaco-editor/react, @pierre/highlights, embla-carousel-autoplay, embla-carousel-react, elkjs, motion, pele, @heroicons/react, streamdown, dompurify, unist-util-visit, html-to-image, katex, mediabunny, qrcode.react, remark-directive

## Side by side

| | OpenSpec | dify |
|---|---|---|
| Size | 144,693 lines written, 218 code files | 2,369,007 lines written, 6,557 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 | 5.1% of its commits signed by AI. With GitHub Copilot, Claude Code, Gemini CLI, Codex, Jules, Devin, Cursor, and Warp |
| Activity | Last push November 4, 2026, 967 commits, 73,952 stars | Last push November 4, 2026, 14,820 commits, 160,382 stars |
| Tests | 245 test files. 74.3% of its code files have a test that imports them | 4,748 test files. 67.4% 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 dify?

dify, with 2,369,007 lines written; OpenSpec has 144,693.

The proof: [langgenius/dify's code at commit 1ac9aa0](https://github.com/langgenius/dify/tree/1ac9aa0d3c93733667d2095f3de2fa4cae0a3e1d)

### Which has more GitHub stars, OpenSpec or dify?

dify, with 160,382 stars; OpenSpec has 73,952.

The proof: [langgenius/dify on GitHub](https://github.com/langgenius/dify)

### Which has more tests, OpenSpec or dify?

dify, with 4,748 test files; OpenSpec has 245.

The proof: [langgenius/dify's code at commit 1ac9aa0](https://github.com/langgenius/dify/tree/1ac9aa0d3c93733667d2095f3de2fa4cae0a3e1d)

### Which was updated more recently, OpenSpec or dify?

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 dify?

OpenSpec: an AI signed 28.9% of its commits, with Claude Code, Codex, CodeRabbit, Cursor, Mistral Vibe, GitHub Copilot, Qwen Code, and Crush; in dify, 5.1%.

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)
- langgenius/dify: Read on November 4, 2026, at commit 1ac9aa0 (https://github.com/langgenius/dify/tree/1ac9aa0d3c93733667d2095f3de2fa4cae0a3e1d)

## 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.