# LockStudy vs Greatest Common Divisor PRO

The clearest difference is in-app purchases: Greatest Common Divisor PRO at none against LockStudy's 2. Greatest Common Divisor PRO also leads on iOS requirement (15.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. LockStudy sells 2 in-app purchases, starting at $1.99 per month. Greatest Common Divisor PRO asks for nothing beyond the download.

## The numbers

| Metric | LockStudy | Greatest Common Divisor PRO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | — |
| Size | 8 MB | 179 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Glanz Studio](https://appshunter.io/developer/1785357972) | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) |

## What reviewers say

### LockStudy

[App page](https://appshunter.io/ios/app/lockstudy-built-for-focus/id6756006023)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LockStudy Pro Monthly | $1.99 | per month |
| LockStudy Pro Lifetime | $22.99 | one-time |


### Greatest Common Divisor PRO

[App page](https://appshunter.io/ios/app/greatest-common-divisor-pro/id6802801796)

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

**In-app purchases:** none


## Frequently asked questions

### Is LockStudy free?

LockStudy is free to download, with in-app purchases available.

### Is Greatest Common Divisor PRO free?

Greatest Common Divisor PRO is free to download, with no in-app purchases.

### Do LockStudy or Greatest Common Divisor PRO have ads?

Neither LockStudy nor Greatest Common Divisor PRO shows ads.

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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.*