# Fuzen — Think in Fuzen

> Think in Fuzen (iPhone/iPad app by JUNGLAE JO.)

- Source: https://appshunter.io/ios/app/fuzen/id6794620986 (this page in markdown: same URL + `.md`)
- Developer: [JUNGLAE JO](https://appshunter.io/developer/6780321351)
- Category: Education, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 29 MB
- Languages: American English
- Released: 2026-08-05
- Data updated: 2026-08-14
- User reviews in markdown: https://appshunter.io/ios/app/fuzen/id6794620986/reviews.md

## What is 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/

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Fuzen Full Unlock | $4.99 | one-time |



## Version history (last 1 release)

### 1.0.0 — 2026-08-05

No release notes.

## More apps by JUNGLAE JO

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- [ラクビル](https://appshunter.io/ios/app/id6780785397)
- [もりのがっこう](https://appshunter.io/ios/app/id6783620641)
- [Phrase Flow: Daily Wisdom](https://appshunter.io/ios/app/phrase-flow-daily-wisdom/id6792987031)

All apps by JUNGLAE JO: https://appshunter.io/developer/6780321351

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-14.*