Fuzen

Think in Fuzen — learn functional programming with an embedded REPL. No setup, no memorization drills: write expressions, evaluate, and trace steps from the first screen. • Instant REPL (Playground) • Functional curriculum Phases 1–5 • Step trace visualization • Tail-call optimization • Fully offline Free: Playground + Phases 1–2. One-time unlock for Phases 3–5. Privacy: no account, offline, no ads. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/