Developer Playground

What it does

Developer Playground is a collection of 10+ powerful, privacy-first tools for modern web development for developers, designers and students. All tools run entirely in your browser - your code never leaves your device.

Free, privacy-first developer tools that run entirely in your browser. 30+ tools including VPAT generator, ARIA reference, code formatters, image optimizer, UUID/hash generators, and more. No tracking, no signup, WCAG 2.2 AA compliant.

Free browser tools for accessibility, formatting, and generation. No tracking, no signup. Everything runs locally in your browser—your code and content never leave your device. Create and share accessible web components with live preview and accessibility checks. Create professional VPAT® 2.5 accessibility conformance reports. Export as DOCX, HTML, or JSON. Check WCAG AA/AAA color contrast ratios with live preview and accessible suggestions. Complete WAI-ARIA reference with 69 roles and 45 attributes. Code examples and live demos. Upload Excel reports, edit inline, and use AI to rewrite and improve accessibility findings. Convert PDF documents to clean, semantic HTML using AI. Live preview…from playground.halfaccessible.com

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  Wing Playground2024 · winglang.io · ▲253

  Iterate on cloud apps in milliseconds, not minutes

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  Practice.dev2020 · ▲196

  Learn programming for free.

• PF
  Private front-end code playgrounds2019 · frontendlane.github.io · ▲35
• OS
  Open-source sandbox for your product teamJul 2026 · ▲17

  Kshitij and Rahul here. We're building Playground, an open-source sandbox that lets your non-technical teams prototype directly on production codebases, without bugging you (developers) to spin up and maintain another repo. The repo is here: https://github.com/B1u3B01t/design-playground. We've been working together for six years. Last year we built an AI design agent because we thought designers were the biggest bottleneck. But we were wrong. After talking to teams, we realised designers, PMs, founders and even sales people all wanted to quickly change and explore flows…

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  Web-Playground – An Enjoyable Playground for HTML, JavaScript and CSS2015 · github.com · ▲13

  An enjoyable playground for HTML, JavaScript and CSS - d6u/web-playground

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  Free Tools for Developers2024 · ▲12

  Essential free tools for developers, all in one place

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  /dev/null▲484

  a social network for devs

  Dev tools · 3d 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 · 28d 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 · 26d ago · github.com

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  OpenBot▲362

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

  Dev tools · 23d ago · openbot.run

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  Talanoa▲346

  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 · 21d ago · talanoa.email

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  CoreSpeed▲332

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

  Dev tools · 28d ago · corespeed.io

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  Cursor 2.0▲957

  Our first coding model and new interface for agents

  AI · Oct 2025 · cursor.com

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  Flask▲806

  Notion + Loom, for video collaboration.

  AI · 2025 · flask.do

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  Strange Attractors▲804

  I went down the rabbit hole on a side project and ended up building this: Strange Attractors(https://blog.shashanktomar.com/posts/strange-attractors). It’s built with three.js. Working on it reminded me of the little "maths for fun" exercises I used to do while learning programming in early days. Just trying things out, getting fascinated and geeky, and being surprised by the results. I spent way too much time on this, but it was extreme fun. My favorite part: someone pointed me to the Simone Attractor on Threads. It is a 2D attractor and I asked GPT to extrapolate it to…

  AI · Oct 2025 · blog.shashanktomar.com

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  Orchestra▲793

  A chat-centric workspace for builders and modern teams

  Work · 2025 · orch.so

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  Autism Simulator▲779

  Hey all, I built this. It’s not trying to capture every autistic experience (that’d be impossible). It’s based on my own lived experience as well as that of friends on the spectrum. I'm trying to give people a feel for what masking, decision fatigue, and burnout can look like day-to-day. That’s hard to explain in words, but easier to show through choices and stats. I'm not trying to "define autism". I’ve gotten good feedback here about resilience, meds, and difficulty tuning. I’ll keep tweaking it. If even a few people walk away thinking, "ah, maybe that’s why my coworker struggles in those…

  Life & fun · 2025 · autism-simulator.vercel.app

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  Director▲768

  Lovable for web automation

  AI · 2025 · director.ai