# X51 vs Dr.Saber Courses

The clearest difference is update cadence: Dr.Saber Courses at every 2 weeks against X51's every 5 weeks. X51's advantage is iOS requirement (13.4 vs 15.0). 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.

X51 ships an update every 5 weeks, Dr.Saber Courses every 2 weeks. The most recent releases landed on October 27, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | X51 | Dr.Saber Courses |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Size | 17 MB | 97 MB |
| Requires iOS | **13.4** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Advanced Group For Information Technology - AGI](https://appshunter.io/developer/1465512100) | [CodeShield Software Solutions](https://appshunter.io/developer/1699592565) |

## What reviewers say

### X51

[App page](https://appshunter.io/ios/app/x51/id1561211181)

**Features:** macOS Compatibility

**In-app purchases:** none


### Dr.Saber Courses

[App page](https://appshunter.io/ios/app/drsaber-courses/id6739266480)

**In-app purchases:** none


## Frequently asked questions

### Is X51 free?

X51 is free to download, with no in-app purchases.

### Is Dr.Saber Courses free?

Dr.Saber Courses is free to download, with no in-app purchases.

### Do X51 or Dr.Saber Courses have ads?

Neither X51 nor Dr.Saber Courses shows ads.

### Which is updated more often, X51 or Dr.Saber Courses?

X51 ships an update every 5 weeks, and Dr.Saber Courses every 2 weeks. Most recently, X51 was updated on October 27, 2026 and Dr.Saber Courses on October 14, 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.*