Compare
userland.run compared with other in-browser runtimes
Running code in a browser tab can be done several ways: reimplement Node on browser APIs, compile a new kernel to wasm, or emulate a whole CPU. Each choice trades speed, fidelity, licensing and openness differently. These pages lay out the trade-offs with sources — including where the alternatives are the better fit.
Compare · StackBlitz WebContainersvs WebContainersMature, fast, proprietary Node-in-the-browser vs an open-source emulator that runs real Linux binaries.Compare · BrowserPodvs BrowserPodA commercial wasm-native kernel with metered pods vs an open-source emulator you host yourself.Compare · CodeSandbox Sandpack + Nodeboxvs Sandpack + NodeboxA lightweight Node-compatible runtime for code playgrounds vs a Linux emulator with real binaries.Compare · container2wasmvs container2wasmFull-system emulation of any container image vs a user-mode emulator with an SDK and fast tiers.
At a glance
A summary of the detailed pages, each of which cites its sources. Last verified: 2026-10-11.
| Approach | Runs Node by | Prebuilt Linux binaries | License | |
|---|---|---|---|---|
| userland.run | User-mode RV64GC emulator + host-engine, wasm and Boa runners | Real Node ELF on the emulator, or nodert on the browser's JS engine | Yes (riscv64) | AGPL-3.0 / MPL-2.0, or commercial |
| WebContainers | Wasm-based OS with Node on the browser's JS engine | Browser JS engine | No | Proprietary runtime; commercial license for for-profit production |
| BrowserPod | Wasm-native kernel, apps compiled with Cheerp | Browser JS engine | Not yet (x86 via CheerpX on the roadmap) | Proprietary, API key, metered |
| Sandpack + Nodebox | Node-compatible APIs on browser primitives | Reimplemented Node APIs | No | Sandpack Apache-2.0; Nodebox Sustainable Use License |
| container2wasm | Full-system emulation of a container image | Whatever the image contains, emulated | Yes (x86_64, riscv64, AArch64) | Apache-2.0 (+ bundled components) |