# Probability(Math Drills) vs Combinatorics Calculator

The clearest difference is in-app purchases: Probability(Math Drills) at none against Combinatorics Calculator's 8. Probability(Math Drills) also leads on iOS requirement (12.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Combinatorics Calculator sells 8 one-off in-app purchases. Probability(Math Drills) asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on August 4, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Probability(Math Drills) | Combinatorics Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Size | 28 MB | 180 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [郷 田村](https://appshunter.io/developer/1574588679) | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) |

## What reviewers say

### Probability(Math Drills)

[App page](https://appshunter.io/ios/app/probabilitymath-drills/id1632889899)

**Features:** macOS Compatibility

**In-app purchases:** none


### Combinatorics Calculator

[App page](https://appshunter.io/ios/app/combinatorics-calculator/id6472453602)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +30 User Tokens | $0.29 | one-time |
| +1 Convenience Token / 6h, max. +2 | $0.59 | one-time |
| +2 Convenience Tokens / 6h, max. +4 | $0.99 | one-time |
| +150 User Tokens | $0.99 | one-time |
| +300 User Tokens | $1.49 | one-time |
| +4 Convenience Tokens / 6h, max. +8 | $1.59 | one-time |
| Lifetime Access | $1.99 | one-time |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Probability(Math Drills) free?

Probability(Math Drills) is free to download, with no in-app purchases.

### Is Combinatorics Calculator free?

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

### Do Probability(Math Drills) or Combinatorics Calculator have ads?

Neither Probability(Math Drills) nor Combinatorics Calculator shows ads.

### Which is updated more often, Probability(Math Drills) or Combinatorics Calculator?

Probability(Math Drills) ships an update every 3 weeks, and Combinatorics Calculator every 3 weeks. Most recently, Probability(Math Drills) was updated on August 4, 2026 and Combinatorics Calculator on September 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.*