Scratchboard

What it does

Create, simulate, and collaborate on electronic circuits in your browser. Test digital circuits with advanced simulation engine and AVR microcontroller support. Perfect for hardware engineers, makers, and students.

• IM
  I made a little digital circuit simulator that operates on PNGs2022 · github.com · ▲259

  This is a little toy project of mine that lets you simulate digital logic graphs. It was inspired by Minecraft's Redstone and the Piet esolang. It's got some serious drawbacks-- you write circuits as PNGs and simulate them with a Python interface. It's slow to run and slow to experiment with. And it is certainly difficult to use for people with any kind of color blindness. But despite that, I hope this can still be a fun toy!

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  Diode2022 · ▲156

  Build and simulate circuits on a breadboard in 3D

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  Experimenters Circuits2024 · ▲161

  Educational online virtual electricity lab, try for free

• IB
  InstaPart – Build circuit boards faster with instant parts2016 · snapeda.com · ▲309
• CO
  CircuitVerse – Online Digital Circuit Simulator2018 · circuitverse.org · ▲145
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  circuits.io2014 · ▲74

  Learn electronics and easily create circuit boards online

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  Dograh▲592

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  x1▲516

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• IM
  I made an open-source laptop from scratch▲3,237

  Hello! I'm Byran. I spent the past ~6 months engineering a laptop from scratch. It's fully open-source on GH at: https://github.com/Hello9999901/laptop

  Dev tools · 2025 · byran.ee

• TI
  Tetris in a PDF▲1,289

  I realized that the PDF engines of modern desktop browsers (PDFium and PDF.js) support JavaScript with enough I/O primitives to make a basic game like Tetris. It was a bit tricky to find a union of features that work in both engines, but in the end it turns out that showing/hiding annotation "fields" works well to make monochrome pixels, and keyboard input can be achieved by typing in a text input box. All in all it's quite janky but a nice reminder of how general purpose PDF scripting can be. The linked PDF is all ASCII so you can just open it in a text editor, or have a look at…

  Life & fun · 2025 · th0mas.nl

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  21st.dev▲1,211

  Github + Pinterest to make your AI websites look beautiful

  Dev tools · 2025 · 21st.dev

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  Raycast Focus▲990

  Stay in flow by blocking distracting apps and websites

  Work · 2025 · raycast.com

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  JoggAI 2.0: AI Avatar Generator▲967

  Create lifelike, personalized AI avatars from text prompts

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  Lovable + Builder.io▲873

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