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# zeal.tools
> **Free tools, made with zeal.**
> No sign-ups, no watermarks, no nonsense. Every tool usable three ways: **UI · REST API · MCP.**
The web is full of bad utility tools — ad-stuffed QR generators, watermarked outputs, forced sign-ups. zeal.tools is the antidote: fast, clean, open-source tools that actually work, each one also callable programmatically.
## The zero-dependency story
**Every tool's core logic ships with zero runtime npm dependencies.** Open `package.json`: the app shell is Nuxt + Tailwind, and that's it. The QR encoder is our own from-scratch implementation of ISO/IEC 18004 — segment encoding, Reed–Solomon error correction over GF(256), all 8 mask patterns with penalty scoring. Even the server-side PNG writer is ours.
Why bother?
1. **Auditable in an afternoon** — a tool site asks for your WiFi passwords and contact details; you should be able to read every line that touches them. There's no supply chain here to attack.
2. **Isomorphic by construction** — pure functions with no DOM or npm baggage run identically in your browser, in Cloudflare Workers, and behind the MCP endpoint. One implementation, three surfaces.
3. **Verified, not vibes** — every build round-trips thousands of payloads through an *independent* decoder (a devDependency, never shipped) across all QR versions, error-correction levels, and masks.
## The Zeal Promise
On every tool, non-negotiable:
- ✅ No sign-up — ever
- ✅ No watermarks on any output
- ✅ No ads near the download action
- ✅ Works fully on mobile
- ✅ Privacy-first: client-side processing wherever possible
- ✅ Open source (MIT) — audit it, contribute, self-host
- ✅ Zero runtime dependencies in tool logic
## Three ways to use every tool
**UI** — [zeal.tools](https://zeal.tools)
**REST API** — no key, no sign-up:
```bash
curl -X POST https://zeal.tools/api/v1/qr \
-H 'content-type: application/json' \
-d '{"data": "https://zeal.tools"}' # → SVG
curl 'https://zeal.tools/api/v1/qr?data=hello&format=png' -o qr.png
```
**MCP** — add to any MCP client (Claude, IDEs, agents):
```json
{ "mcpServers": { "zeal-tools": { "url": "https://zeal.tools/mcp" } } }
```
## Architecture
One Nuxt 4 app, composed from **domain slices via Nuxt Layers**. Everything belonging to a tool lives in one folder:
```
tools/qr-code-generator/
├── meta.ts # registry entry: name, keywords, api/mcp flags
├── core/ # ★ pure, isomorphic, ZERO-DEP logic + unit tests
├── app/ # pages, components, composables (this slice only)
└── server/ # REST endpoint — imports the SAME core/
```
Adding a tool = adding a folder (+ one line in `shared/registry`). Deleting a tool = deleting a folder. Slices never import from each other; shared code graduates to `shared/`. See [CONTRIBUTING.md](CONTRIBUTING.md) for the full slice template.
## Development
```bash
pnpm install
pnpm dev # local dev server
pnpm test # unit tests (incl. encoder round-trip verification)
pnpm build # build for Cloudflare Workers
pnpm preview # wrangler dev against the real Workers runtime
pnpm deploy # wrangler deploy
```
## License
[MIT](LICENSE) — built with zeal.
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