🧙 Haskell Playground

Write Haskell 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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Haskell can't run inline (yet)

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

Open in Replit ↗ Open in OneCompiler ↗

Sample Haskell code:

Haskell example

-- Haskell list comprehension
factorial :: Int -> Int
factorial 0 = 1
factorial n = n * factorial (n - 1)

main = print (factorial 10)

Try these Haskell 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.