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.

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  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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  I made a digital circuit drawing and simulation game2024 · github.com · ▲139

  Inspired by games like Turing Complete/Virtual Circuit Board/Logic World, I tried to make a mix of aseprite and wiredworld/wired-logic, the idea being the user can build a digital circuit using a "fullstack" pixelart creation workflow. The circuit is just an image. The primitives are (i) connected wires which have undefined, 0 or 1 state during simulation (displayed brighter or darker in function of the state) and (ii) NANDs, which are little pixel triangles. During simulation the user can interact with any wire by clicking on it, toggling its state, which is cool for messing…

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  Diode2022 · withdiode.com · ▲156

  Build and simulate circuits on a breadboard in 3D

• VB
  Virtual breadboard in the browser, inspired by Ben Eater's 65022021 · tejotron.com · ▲409
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  Experimenters Circuits2024 · experimenters.app · ▲161

  Educational online virtual electricity lab, try for free

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  circuits.io2014 · library.io · ▲74

  Learn electronics and easily create circuit boards online

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  /dev/null▲468

  a social network for devs

  Dev tools · 2d ago · dev-null.sh

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  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 27d ago · github.com

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  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 25d ago · github.com

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  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 22d ago · openbot.run

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  Talanoa▲340

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 20d ago · talanoa.email

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  CoreSpeed▲332

  One MCP for everything your agents need: apps, memory, tools

  Dev tools · 27d ago · corespeed.io

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  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

  I originally built this app to organize and reuse interesting React + Tailwind components I came across on Twitter, inspired by the shadcn/ui approach. Later, a friend started contributing their own components, and it got me thinking—this could grow into something bigger, like an NPM for design engineers to share and use components. Would love to hear your thoughts!

  Dev tools · 2025 · 21st.dev

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  JoggAI 2.0: AI Avatar Generator▲967

  Create lifelike, personalized AI avatars from text prompts

  AI · 2025 · jogg.ai

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  Lovable + Builder.io▲873

  Turn Figma designs into full stack apps with AI

  Dev tools · 2025 · figma.com

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  Cs16.css – CSS library based on Counter Strike 1.6 UI▲819

  CSS library based on Counter Strike 1.6 UI.

  Life & fun · 2025 · cs16.samke.me