# CertPrep vs Subtraction for Kids

CertPrep and Subtraction for Kids are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. CertPrep sells 1 one-off in-app purchase and Subtraction for Kids sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | CertPrep | Subtraction for Kids |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Size | 4 MB | 1 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jan Roldan Hernandez](https://appshunter.io/developer/1896444338) | [MD Shahariar Nazim Joy](https://appshunter.io/developer/1893961943) |

## What reviewers say

### CertPrep

[App page](https://appshunter.io/ios/app/certprep-cloud-fundamentals/id6775019424)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Azure Cert Companion Premium | $3.99 | one-time |


### Subtraction for Kids

[App page](https://appshunter.io/ios/app/subtraction-for-kids-math/id6792043674)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Everything | $4.99 | one-time |


## Frequently asked questions

### Is CertPrep free?

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

### Is Subtraction for Kids free?

Subtraction for Kids is free to download, with in-app purchases available.

### Do CertPrep or Subtraction for Kids have ads?

Neither CertPrep nor Subtraction for Kids 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.*