# SkillCert vs Probability Distribution Lab

The clearest difference is iOS requirement: SkillCert at 15.0 against Probability Distribution Lab's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. SkillCert sells 3 in-app purchases, starting at $2.99 per month and Probability Distribution Lab sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | SkillCert | Probability Distribution Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 days | — |
| Size | 155 MB | 9 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Yotaro SATO](https://appshunter.io/developer/1862063948) | [AKIO FURUTSUKA](https://appshunter.io/developer/1869216839) |

## What reviewers say

### SkillCert

[App page](https://appshunter.io/ios/app/skillcert-mostcertifications/id6756679793)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SKILL Cert by AI ライトプラン | $2.99 | per month |
| SKILL Cert by AI スタンダードプラン | $9.99 | per month |
| SKILL Cert by AI プレミアムプラン | $29.99 | per month |


### Probability Distribution Lab

[App page](https://appshunter.io/ios/app/probability-distribution-lab/id6818569745)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $6.99 | one-time |


## Frequently asked questions

### Is SkillCert free?

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

### Is Probability Distribution Lab free?

Probability Distribution Lab is free to download, with in-app purchases available.

### Do SkillCert or Probability Distribution Lab have ads?

Both SkillCert and Probability Distribution Lab show 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.*