# JavaScript Challenge — Feed your brain. Level up.

> Feed your brain. Level up. (iPhone/iPad app by MUSTAFA GURBUZ.)

- Source: https://appshunter.io/ios/app/javascript-challenge/id6808905700 (this page in markdown: same URL + `.md`)
- Developer: [MUSTAFA GURBUZ](https://appshunter.io/developer/1777685795)
- Category: Developer Tools, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 13 MB
- Languages: American English
- Released: 2026-09-09
- Data updated: 2026-09-17
- User reviews in markdown: https://appshunter.io/ios/app/javascript-challenge/id6808905700/reviews.md

## What is JavaScript Challenge?

Feed your brain. Level up.

Learn to write real JavaScript by solving one puzzle at a time, right on your phone.

JavaScript Challenge is a single path of original coding problems, from your first function to graphs, dynamic programming and beyond. Every solution runs on-device in real JavaScript and is checked against hidden tests, so passing means it actually works.

Free to start: the opening levels are free, then unlock the full path with a single one-time purchase. No subscription, no ads, no account.

WRITE REAL CODE
• A coder keyboard built for JavaScript: tab, brackets, quotes, snippets, undo
• Instant feedback with named tests, expected vs actual output
• Some levels enforce rules (no built-in array helpers, recursion required) so you learn the technique, not the shortcut

LEARN THE RIGHT WAY
• Three-tier hints from Rhino, your smug but surprisingly helpful mentor
• Curated solutions after you solve: naive vs optimal, time and space complexity
• Topics: strings, arrays, objects, closures, recursion, dynamic programming, sorting, searching, graphs, trees, hashing, bit tricks, grids, greedy strategies, intervals

STAY MOTIVATED
• One path, no shortcuts: easy → medium → hard, with performance tests on the hardest levels
• XP, player levels, daily streaks and badges
• Six themes, dark and light

PRIVATE BY DESIGN
• Works fully offline, no account, no tracking — your progress stays on your device
• No ads, ever

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Path | $6.99 | one-time |


## Chart rankings

- #118 in Top Grossing · Developer Tools (US App Store)


## Version history (last 3 releases)

### 1.0.2 — 2026-09-16

You may be asked to rate the app after a few solved challenges.

### 1.0.1 — 2026-09-15

Keyboard now follows the iOS English layout with a dot key on the main view.

### 1.0 — 2026-09-09

No release notes.

## More apps by MUSTAFA GURBUZ

- [Python Challenge](https://appshunter.io/ios/app/python-challenge/id6738021729)
- [Lulu AI : Imagine Your Pet](https://appshunter.io/ios/app/lulu-ai-imagine-your-pet/id6751619333)
- [Square Cropper](https://appshunter.io/ios/app/square-cropper/id6757404402)
- [Car King: Repair Simulator](https://appshunter.io/ios/app/car-king-repair-simulator/id6804577326)
- [SQL Challenge](https://appshunter.io/ios/app/sql-challenge/id6809016873)

All apps by MUSTAFA GURBUZ: https://appshunter.io/developer/1777685795

## Related topics

[javascript challenge](https://appshunter.io/ios/topics/javascript-challenge)

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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 2026-09-17.*