WebVM is a virtual Linux environment running in the browser via WebAssembly. WebVM doesn’t require registration. It can be forked, unmodified with no restrictions. WebVM is powered by CheerpX, an x86 virtualization engine in WASM which enables the safe, sandboxed execution of Linux binaries client-side. CheerpX includes an x86-to-WebAssembly JIT compiler, a virtual block-based file system, and a Linux syscall emulator. Both WebVM and CheerpX are free-to-use for FOSS and personal projects.
WebVM is a serverless virtual Linux machine that runs a complete, unmodified Debian distribution of Linux in the browser, using WebAssembly.
I’ve been looking at the underlying tech, and the engineering required to solve the "fidelity gap" is worth noting:
The CheerpX engine: a WebAssembly virtualization engine for Linux binaries, based on a x86-to-WebAssembly JIT compiler.
Operating system layer: a layer which includes a virtual block-based file system, and a Linux syscall emulator, allowing it to be Linux ABI-compatible without any backend provisioning.
Networking: since browsers don’t natively support TCP/UDP, this setup integrates with Tailscale to provide full networking support via a VPN, enabling the VM to access the internet.
I’d love to hear what the you think about of WebVM or what specific x86 CLI tools you'd run in this environment.
@liam_oscarlena Totally agree — the “fidelity gap” framing is spot on.
Getting unmodified Debian + x86 binaries running client-side with a syscall layer + block FS is already a huge engineering win, and the networking story via Tailscale makes it feel actually usable (not just a cool demo).
This is one of those projects that instantly expands what “serverless” can mean. Congrats to the team — really impressive work 👏
@liam_oscarlena Totally agree — the “fidelity gap” point is the story here.
Running an unmodified Debian + x86 binaries client-side (with syscall emulation + a real block FS) is already a huge engineering achievement, and the Tailscale networking angle makes it feel genuinely usable instead of just a cool demo.
This is one of those projects that expands what “serverless” can mean. Congrats to the team 👏
Very useful when you need to ssh or run a quick script, but you are on a locked down Windows machine!
Didn’t expect this to feel so usable. A full Linux VM in the browser with no setup is super convenient for quick experiments and learning.