I built a WASI playground for running CLI binaries in the browser

In plain words

Runno is a browser-based playground for executing WebAssembly System Interface (WASI) command-line binaries without installation. It lets developers run CLI tools directly in a web browser, making it useful for testing, learning, and sharing executable code snippets. The tool targets developers who want to experiment with or demonstrate command-line programs in an accessible, sandbox environment.

written from the facts on this page · September 2026

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  Runno2021 · runno.dev · ▲148

  Make embeddable code snippets that run in the browser

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  WebAssembly System Interface for Deno has been merged into Deno2020 · deno.land · ▲48
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  Wasmer – A Go library for executing WebAssembly binaries2019 · github.com · ▲44

  🐹🕸️ WebAssembly runtime for Go. Contribute to wasmerio/wasmer-go development by creating an account on GitHub.

• GP
  Go playground powered by WASM that runs in the browser2021 · go-playground-wasm.vercel.app · ▲140
• WS
  Webassembly.sh – WebAssembly WASI Terminal on your Browser2019 · webassembly.sh · ▲8

  WebAssembly.sh: an online WebAssembly terminal to run WASI modules directly on your browser

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  Firefox in WebAssemblyJul 2026 · developer.puter.com · ▲273

  This is the entire Firefox browser rendering to a element. Gecko, all UI components, and the Spidermonkey JS engine are all compiled and running in WebAssembly. Here are a few things you might find interesting: - This is fully end to end encrypted! We use the WISP protocol for TCP-over-websockets. - There is a novel WASM->JS JIT for experimental site speedup - This port cost over 25k in opus/fable tokens for debugging and JIT research This was just a fun experiment to push the boundaries of WebAssembly. For a more usable "browser in browser" experience, we also built…

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  /dev/null▲490

  a social network for devs

  Dev tools · 4d 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 · 29d ago · github.com

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  Run full iOS 16.5 firmware on Android Devices▲411

  Contribute to oosexgang/hackios-xnu-kernel development by creating an account on GitHub.

  Dev tools · 17h 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 · 27d ago · github.com

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  OpenBot▲362

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

  Dev tools · 24d 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

• I3
  I 3D scanned the interior of the Great Pyramid at Giza▲1,752

  Hey HN, I 3d scanned the interior of the Great Pyramid / Khufu's pyramid for the Giza Project this summer and just finished the guided version to share. Would love feedback and/or problems you encounter. I used both a Leica BLK 360 and Matterport Pro 2 to do the scanning and the Matterport SDK for the web viewer. Matterport's web display with Three.js has been the most accessible to a wide audience in the past (previous iterations are in Unity and Unreal, but difficult to download over slower connections). I've been interviewing social studies teachers around the 6th grade level to…

  Dev tools · 2022 · giza.mused.org

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  Clay▲819

  Discover, organize, and deepen relationships

  Work · 2022 · me.sh

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  Restfox – Open source lightweight alternative to Postman▲758

  Last time I posted this it didn't garner much interest. There have been lots of improvements and fixes since the last release. Quick list of features: - Workspaces - Tabs - Nested Folders - Lots of context menus - Response history - Plugins - Runs fully in the browser and runs offline if necessary - Chrome and Firefox extension to bypass CORS restrictions - Desktop builds for all platforms - GraphQL support - Import collections exported from Postman and Insomnia - Simple user friendly interface I built this because I love Insomnia but wanted a portable version that I could run in the…

  Dev tools · 2022 · restfox.dev

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  Sponsor This Newsletter▲707

  100+ newsletters ready to promote your product

  Growth · 2022

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  Micro SaaS HQ▲672

  Profitable Micro SaaS ideas, supportive community

  Life & fun · 2022 · microsaashq.com

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  America – Road Trip Simulator▲663

  APIs are a little like the open road—always waiting, full of opportunity, but hardly utilized. So here’s America, composed of several APIs that paint a vivid, real-time picture of a good old-fashioned road trip. Get local classifieds and photos. Tune into local radio stations. Talk wit other drivers. And more. Exploring the country by car was an invaluable experience for me during my time in the states. I’ve since moved to Barcelona, and find myself missing the territory. This is my attempt at recreating the magic.

  Life & fun · 2022 · 4m3ric4.com