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Leaning Technologies Developer Hub
Company blog · labs.leaningtech.com/blogprogrammingsystemsweb
Leaning Technologies Developer Hub is the company blog at labs.leaningtech.com, writing about programming, systems and web. Since 2023, 26 different Hacker News readers have linked it 62 times, most often “How we added full networking to WebVM via Tailscale (2022)”. No feed was found, so read it on the site itself.
Run C/C++, Java, and native code in the browser with our WebAssembly developer tools and JavaScript libraries: Cheerp, CheerpJ, and CheerpX
Most-linked posts?
- How we added full networking to WebVM via Tailscale (2022)6 people · 7 mentions · first linked 2024-03-13
- A Linux-like kernel in a browser tab – deep dive in the BrowserPod architecture3 people · 4 mentions · first linked 2026-05-18
- CheerpX is x86 virtualization to run executables and OS client-side3 people · 3 mentions · first linked 2024-01-04
- Beyond WASI: Running any Rust application in the browser with BrowserPod 3.03 people · 3 mentions · first linked 2026-08-13
- CheerpJ 3.1: JVM in WebAssembly3 people · 3 mentions · first linked 2025-02-05
- CheerpJ 4.0: WebAssembly JVM for the browser, now with Java 11 and JNI support2 people · 5 mentions · first linked 2025-04-23
- CheerpX 1.0: High performance x86 virtualization in the browser via WebAssembly2 people · 4 mentions · first linked 2024-12-04
- BrowserPod: Universal in-browser sandbox powered by WASM (starting with Node.js)2 people · 3 mentions · first linked 2026-02-18
- WebVM 2.0: A complete Linux Desktop Environment in the browser via WebAssembly2 people · 2 mentions · first linked 2024-11-13
- CheerpJ 3.0: A WebAssembly JVM to run real-world applications in the browser2 people · 2 mentions · first linked 2024-02-01
What Hacker News says?
Looks like the underlying project is not open source: "WebVM is based on a CheerpX build that we host. We encourage users to deploy their own versions of WebVM, but we don’t currently allow self-hosting of the CheerpX engine itself. This public build of CheerpX is provided as-is and is free to use for technological exploration, testing and non-commercial uses. If you want to build a product on top of CheerpX/WebVM,…
Comment linking /blog/mini-webvm-your-linux-box-from-dockerfile-via-wasm
on “WebVM is a server-less virtual Linux environment running client-side”Submitted CheerpJ 4.1: Java in the browser, now supporting Java 17 (preview) as a story · 120 points
HN discussionYes: https://labs.leaningtech.com/cheerpx#cheerpx-versus-v86jslin... Also, a little below: CheerpX currently focuses on user mode (ring 3), and does not fully emulate the kernel (ring 0). We do, however, implement a subset of the Linux system call interface, which is enough to run most applications.
Comment linking /cheerpx
on “WebVM is a server-less virtual Linux environment running client-side”Submitted WebVM 2.0: A complete Linux Desktop Environment in the browser via WebAssembly as a story · 97 points
HN discussionAre you associated with Tail Scale? Is Tail Scale like a proxy? Are other options available - is Tail Scale open source too? edit: Saw your other reply! https://labs.leaningtech.com/blog/webvm-virtual-machine-with...
Comment linking /blog/webvm-virtual-machine-with-networking-via-tailscale
on “WebVM is a server-less virtual Linux environment running client-side”Submitted BrowserPod: In-browser full-stack environments for IDEs and Agents via WASM as a story · 63 points
HN discussionWe support networking via Tailscale, we wrote a detailed blog post some time ago: https://labs.leaningtech.com/blog/webvm-virtual-machine-with...
Comment linking /blog/webvm-virtual-machine-with-networking-via-tailscale
on “WebVM is a server-less virtual Linux environment running client-side”Submitted CheerpJ 3.0: A WebAssembly JVM to run real-world applications in the browser as a story · 41 points
HN discussionUsing Tailscale is the most effective solution for in-browser networking, we wrote at length about the topic some time ago: https://labs.leaningtech.com/blog/webvm-virtual-machine-with...
Comment linking /blog/webvm-virtual-machine-with-networking-via-tailscale
on “WebVM is a server-less virtual Linux environment running client-side”Submitted CheerpJ 3.1: JVM in WebAssembly as a story · 19 points
HN discussionWhen I read this, I got a little too excited and thought they managed to get wireguard connections happening in the browser with webassembly (this isn't impossible, but the only attempt[0] I know of so far only works because of extra things tailscale has). It's an idea I've had for a project, but one I haven't had time to dedicate to (yet). In any case, really cool write-up! I wonder if they thought about making `fl…
Comment linking /blog/webvm-virtual-machine-with-networking-via-tailscale
on “JIT WireGuard”Submitted CheerpX is x86 virtualization to run executables and OS client-side as a story · 13 points
HN discussionYep! CheerpX's documentation is available here: https://labs.leaningtech.com/cheerpx
Comment linking /cheerpx
on “Container2wasm: Convert Containers to WASM Blobs”Submitted Beyond WASI: Running any Rust application in the browser with BrowserPod 3.0 as a story · 11 points
HN discussionShameless self-promotion: https://webvm.io Powered by a x86->Wasm JIT. Technical writeup: https://labs.leaningtech.com/blog/webvm-server-less-x86-virt...
Comment linking /blog/webvm-server-less-x86-virtual-machines-in-the-browser
on “Container2wasm: Convert Containers to WASM Blobs”Submitted CheerpJ 4.0: WebAssembly JVM for the browser, now with Java 11 and JNI support as a story · 9 points
HN discussionYou can use the self-hosted version of the Tailscale control plane, called Headscale, but you need our own fork since the upstream version has various issues. We plan to merge these fixes upstream soon. For more info, see the last few paragraph of the Networking section from our latest blog post: https://labs.leaningtech.com/blog/webvm-20#private-networkin...
Comment linking /blog/webvm-20
on “Webvm: Virtual Machine for the Web”Submitted WebVM 2.0: Linux Desktop Environment in the Browser via WebAssembly as a story · 9 points
HN discussionIt also supports Tailscale (or the other way around). If you use SSH from Tailscale Admin it’s actually WebVM you see: https://labs.leaningtech.com/blog/webvm-virtual-machine-with...
Comment linking /blog/webvm-virtual-machine-with-networking-via-tailscale
on “Webvm: Virtual Machine for the Web”Submitted CheerpJ 3.1: JVM in WebAssembly and our roadmap for modern Java in the browser as a story · 7 points
HN discussionShameless plug: CheerpJ is our solution to run any JVM language in the browser, including Clojure. Reflections, Multithreading and Swing / AWT apps are all supported. https://labs.leaningtech.com/blog/cheerpj-4.0 And yes, it can run Minecraft :-) https://browsercraft.cheerpj.com/
Comment linking /blog/cheerpj-4.0
on “Running Clojure in WASM with GraalVM”Submitted CheerpX 1.0: High performance x86 virtualization in the browser via WebAssembly as a story · 6 points
HN discussionThanks for your kind words, appreciated. Link to our blog, we try to regularly publish high quality content: https://labs.leaningtech.com/blog
Comment linking /blog
on “Browsercraft: Java Minecraft in the browser”Submitted CheerpJ 4.0: WebAssembly JVM for the browser, now with Java 11 and JNI support as a story · 5 points
HN discussionI have seen some demos online such as WebVM [1] that use ephemeral devices to enable networking within the browser. It sounds like there is now a limit on the total length of ephemeral sessions on an account that last less than 240 minutes. While I'm not currently affected by this limit, it does seem rather arbitrary. [1]: https://labs.leaningtech.com/blog/webvm-virtual-machine-with...
Comment linking /blog/webvm-virtual-machine-with-networking-via-tailscale
on “Tailscale's Pricing v4”Submitted Cheerpj3: Java Virtual Machine for modern web browsers as a story · 5 points
HN discussionNote that cheerpj is not open source: https://labs.leaningtech.com/cheerpj3/licensing
Comment linking /cheerpj3/licensing
on “Browsercraft – Unmodified Minecraft 1.2.5 in the browser”Submitted Deep Dive into CheerpJ 3.0: A WebAssembly Java Virtual Machine for the Browser as a story · 5 points
HN discussionHi, if you like the idea of Wasm sandboxing you might be interested in what we are working on: BrowserPod :-) https://labs.leaningtech.com/blog/browserpod-beta-announceme... https://browserpod.io
Comment linking /blog/browserpod-beta-announcement
on “Show HN: Amla Sandbox – WASM bash shell sandbox for AI agents”Submitted BrowserPod: Universal in-browser sandbox powered by WASM (starting with Node.js) as a story · 4 points
HN discussion
