Documentation
Demystify Tools is a library of privacy-first utilities. Most run entirely in your browser — no uploads, no signup, no tracking — and keep working offline. You can reach the same tools three ways, all private by design.
Three ways to use a tool
- In your browser. The default. Open a tool and use it — nothing leaves your device.
- Over the REST API.
POST /api/v1/{tool}with JSON. 21 tools bound today. - Through MCP. Run the local server so your AI assistant can call the tools deterministically.
Guides
API documentation
Call any bound tool over a simple REST endpoint. OpenAPI 3.1, anonymous free tier, RFC-9457 errors.
MCP documentation
Give your AI assistant deterministic tools over the Model Context Protocol — the engine computes, the model never guesses.
Embed a tool
Drop any tool into your own site with one <script> tag. Sandboxed iframe, auto-sizing, zero tracking.
Trust & privacy
Every privacy claim mapped to the control that enforces it — and how it's verified.
Quality & coverage
What's live, generated from the registry. Every calculator ships hand-computed goldens.
Contribute on GitHub ↗
Standards, engine + zod I/O, goldens, and the propagation checklist. PRs and tool requests welcome.
Install the packages
The engines, registry, design tokens and self-host runner are versioned packages (publishing is pending — see the repo). The MCP server runs locally:
# once published
npx demystify-tools-mcp