Show HN: 3 yrs later, my JS sandbox has 11M users and an AI agent

  • Posted 11 hours ago by ianberdin
  • 1 points
https://playcode.io
Hi HN! Some of you might remember my 2022 post about building a JavaScript sandbox alone for 6 years.

A lot has happened since:

- 200K monthly users → 11M total users

- 23M projects created

- 9 years total (yes, I started in 2016)

The biggest update: I built an AI coding agent. Works like Cursor, but entirely in your browser. No downloads, no setup.

Why browser-based AI coding makes sense:

- Instant start (no VS Code, no API keys)

- Works on any device

- Perfect for business automations, landings, blogs, prototyping, learning, interviews

- Share your work with one link

The AI part: - All the latest 12+ models (Claude, GPT, Grok, Gemini)

- Real-time streaming

- Multi-file editing

- Pay only for what you use

Still bootstrapped. Still mostly solo. Competing with well-funded startups now, but 11M users and 18 years of refinement is hard to replicate. Yea, I'm insane.

Try it: https://playcode.io

Happy to answer questions about building a browser IDE or adding AI to a mature product!

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