Source: https://seerepo.com/r/Fission-AI/OpenSpec/built
Markdown source: https://seerepo.com/r/Fission-AI/OpenSpec/built.md
Description: OpenSpec is a TypeScript repo. It makes its content with yaml, validates its data with Zod, and is tested with Vitest.

# What is OpenSpec built with?

OpenSpec is a TypeScript repo. It makes its content with yaml, validates its data with Zod, and is tested with Vitest. It has 144,693 written lines, with 245 test files.

Read on November 5, 2026, at commit 3e4d5f0.

Repository: https://github.com/Fission-AI/OpenSpec

## Frontend

### Styles

- **[Tailwind CSS](https://seerepo.com/uses/tailwind-css)**

### Interface

- **Inquirer**: 14 files
- **ora**: 10 files

## Support

### Content

- **[yaml](https://seerepo.com/uses/yaml)**: 8 files

### Validation

- **[Zod](https://seerepo.com/uses/zod)**: 12 files

### Testing

- **Vitest**: 234 files

### Tools

- **commander**: 8 files
- **tinyglobby**: 1 file

### Other

- **chalk**: 17 files
- **smol-toml**: 3 files
- **cross-spawn**: 2 files
- **brace-expansion**: 1 file
- **diff**: 1 file
- **picomatch**: 1 file

## Other repos with a similar stack

- [comet-ml/opik](https://seerepo.com/r/comet-ml/opik/built): Tailwind CSS, ora, yaml, Zod · [Compare](https://seerepo.com/compare/comet-ml/opik/vs/Fission-AI/OpenSpec)
- [NousResearch/hermes-agent](https://seerepo.com/r/NousResearch/hermes-agent/built): Tailwind CSS, yaml, Zod · [Compare](https://seerepo.com/compare/Fission-AI/OpenSpec/vs/NousResearch/hermes-agent)
- [react/react](https://seerepo.com/r/react/react/built): Tailwind CSS, ora, Zod · [Compare](https://seerepo.com/compare/Fission-AI/OpenSpec/vs/react/react)
- [anomalyco/opencode](https://seerepo.com/r/anomalyco/opencode/built): Tailwind CSS, yaml, Zod · [Compare](https://seerepo.com/compare/anomalyco/opencode/vs/Fission-AI/OpenSpec)
- [langgenius/dify](https://seerepo.com/r/langgenius/dify/built): Tailwind CSS, yaml, Zod · [Compare](https://seerepo.com/compare/Fission-AI/OpenSpec/vs/langgenius/dify)
- [farion1231/cc-switch](https://seerepo.com/r/farion1231/cc-switch/built): Tailwind CSS, yaml, Zod · [Compare](https://seerepo.com/compare/farion1231/cc-switch/vs/Fission-AI/OpenSpec)

## Frequently asked questions

### What language is OpenSpec written in?

OpenSpec is written in TypeScript, with 144,693 written lines.

### Does OpenSpec have tests?

Yes. OpenSpec has 245 test files and is tested with Vitest.

### Which repos have a stack like OpenSpec's?

The ones that share most of its stack: comet-ml/opik, NousResearch/hermes-agent, and react/react.

## 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.