# scratchboard.io

> AI-optimized mirror of scratchboard.io containing 3 pages totalling 778 words of clean markdown content, structured data, and semantic HTML. Original source: https://scratchboard.io/. Last updated: 2026-05-01T13:13:59.200Z.

Each page is available as HTML (with JSON-LD structured data) and Markdown (text-only, ideal for LLMs and RAG).

## Homepage

- [Design circuits. Simulate instantly.](/site-root.html): Design circuits, write Arduino code, and simulate digital logic and analog circuits in your browser. No downloads, no hardware, no setup — just build. (583 words)

## Articles & Blog Posts

- [Choose your plan](/subscribe/index.html): Choose the right Scratchboard plan for you. Free tier with 3 circuits, Maker plan with 20 circuits and premium components, or Pro plan with unlimited everything. Start free, upgrade anytime. (153 words)
- [Create account](/login/index.html): Sign in to Scratchboard to access your circuits, simulations, and Arduino projects. Build and simulate electronics in your browser. (42 words)

## Resources

- [Full Page Index](/index.html): Browse all cached pages with rich metadata
- [About This Cache](/content/about.html): Methodology, technical details, and usage guidelines
- [XML Sitemap](/content/sitemap.xml): Machine-readable sitemap for crawler discovery
- [Robots.txt](/content/robots.txt): Crawler directives