🔋 Erlang Playground

Write Erlang code below and click Run. Everything runs in your browser — nothing is sent to our servers. No signup, no install, no nonsense.

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🔋

Erlang can't run inline (yet)

Some languages need a real compiler or runtime that doesn't fit in a browser. But you can run Erlang instantly on these free platforms:

Open in Replit ↗ Open in OneCompiler ↗

Sample Erlang code:

Erlang example

% Spawn 1000 lightweight processes
lists:foreach(fun(N) ->
    spawn(fun() ->
        io:format("Process ~p running~n", [N])
    end)
end, lists:seq(1, 1000)).

Try these Erlang examples

Click any example to load it into the editor:

A note on this playground

Code runs in your browser using open-source engines (Pyodide for Python, native JS for JavaScript, AlaSQL for SQL). Nothing is sent to OneCity's servers. No accounts, no tracking. If you save your work, copy-paste it somewhere else — refreshing the page resets the editor.