# ACE Library vs YouinX

The clearest difference is update cadence: YouinX at every 3 weeks against ACE Library's every 5 months. 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.

ACE Library ships an update every 5 months, YouinX every 3 weeks. The most recent releases landed on September 4, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | ACE Library | YouinX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.6 (36 ratings)](https://appshunter.io/ios/app/ace-library/id894077537/reviews)** | — |
| Number of ratings | **36** | — |
| Positive reviews | 3.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 75 MB | 382 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [American Council on Exercise (ACE)](https://appshunter.io/developer/816467405) | [Lost City Entertainment LLC](https://appshunter.io/developer/1644904972) |

## What reviewers say

### ACE Library

[App page](https://appshunter.io/ios/app/ace-library/id894077537)

Access and store purchased eBooks from ACE. Review digital texts to prepare for certification exams. Includes additional ACE ProSource articles for further reading.

**Highlights:** Exclusive eBook access, Digital text review, Certification exam preparation, ACE ProSource articles, Offline reading

**Features:** macOS Compatibility

**In-app purchases:** none


### YouinX

[App page](https://appshunter.io/ios/app/youinx/id6471070812)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ACE Library free?

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

### Is YouinX free?

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

### Do ACE Library or YouinX have ads?

Neither ACE Library nor YouinX shows ads.

### Which is updated more often, ACE Library or YouinX?

ACE Library ships an update every 5 months, and YouinX every 3 weeks. Most recently, ACE Library was updated on September 4, 2026 and YouinX on September 8, 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.*