# NIE Library vs Challenger App

The clearest difference is update cadence: Challenger App at every 5 months against NIE Library's every 21 months. NIE Library's advantage is iOS requirement (13.4 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NIE Library ships an update every 21 months, Challenger App every 5 months. The most recent releases landed on October 1, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | NIE Library | Challenger App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/challenger-app/id951001308/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 5 months** |
| Monetization | — | Free |
| Size | 32 MB | 24 MB |
| Requires iOS | **13.4** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [National Institute of Education (NIE) Singapore](https://appshunter.io/developer/426893549) | [Reubro International](https://appshunter.io/developer/350516605) |

## What reviewers say

### NIE Library

[App page](https://appshunter.io/ios/app/nie-library/id513175751)

**Features:** macOS Compatibility

**In-app purchases:** none


### Challenger App

[App page](https://appshunter.io/ios/app/challenger-app/id951001308)

Test your knowledge with a quiz app featuring multiple categories and difficulty levels. Earn points for correct answers and track your progress with detailed score breakdowns. Share your achievements with friends.

**Highlights:** Multiple quiz categories, Easy, medium, and hard difficulty levels, Timed questions, Point-based scoring system, Detailed score breakdown with pie charts, View recently played scores, Share scores via email and Facebook

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is NIE Library free?

NIE Library is free to download, with no in-app purchases.

### Is Challenger App free?

Challenger App is free to download, with no in-app purchases.

### Do NIE Library or Challenger App have ads?

Neither NIE Library nor Challenger App shows ads.

### Which is updated more often, NIE Library or Challenger App?

NIE Library ships an update every 21 months, and Challenger App every 5 months. Most recently, NIE Library was updated on October 1, 2026 and Challenger App on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*