# Mastery vs Probs

The clearest difference is price: Probs at Free against Mastery's $1.99. Mastery's advantage is in-app purchases (none vs 2). On update cadence, ads, device support and iOS requirement there is nothing between them.

Probs is free to download; Mastery costs $1.99 up front. Probs sells 2 in-app purchases, starting at $4.99 per month. Mastery asks for nothing beyond the download.

Mastery ships an update every 9 days, Probs weekly. The most recent releases landed on September 7, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Mastery | Probs |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Size | 37 MB | 44 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Benny Jien](https://appshunter.io/developer/1850407151) | [Critical Gameplay](https://appshunter.io/developer/503636770) |

## What reviewers say

### Mastery

[App page](https://appshunter.io/ios/app/mastery-skill-tracker/id6754836317)

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

**In-app purchases:** none


### Probs

[App page](https://appshunter.io/ios/app/probs/id6759471168)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Monthly | $4.99 | per month |
| Decision Pack | $2.99 | one-time |


## Frequently asked questions

### Is Mastery free?

Mastery costs $1.99, with no in-app purchases.

### Is Probs free?

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

### Do Mastery or Probs have ads?

Neither Mastery nor Probs shows ads.

### Which is updated more often, Mastery or Probs?

Mastery ships an update every 9 days, and Probs weekly. Most recently, Mastery was updated on September 7, 2026 and Probs on September 16, 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.*