Erlang/OTP 27.2 and Elixir 1.19.5, cross-compiled with Emscripten. Real preemptive schedulers, real processes, real compile/2 — you can define a module at the prompt and call it. Nothing is sent to a server to be evaluated; the VM is in your browser.

About 5 MB comes over the wire once. Boot after that is roughly 180 ms, and it is the same 180 ms on a fast connection or a slow one — the rest is download.

Made by Thomas.