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Verified Sep 2026

A dynamic, functional Lisp for the JVM

Immutable-by-default functional programming on the JVM: REPL-driven development at Nubank scale.

Rich Hickey's 2007 Lisp on the JVM: immutability by default, a pristine core of data structures, and REPL-driven development that changes how you prototype. Runs on the JVM, JavaScript and CLR. Companies like Nubank (its largest user) run entire banks on it. Thought-provoking even if you never ship it.

Who it's for

Developers who want a functional Lisp on the JVM with immutable data and REPL-driven design.

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