# Combinations & Probabilities vs SIENG

The clearest difference is in-app purchases: SIENG at none against Combinations & Probabilities's 1. SIENG also leads on ads (none vs shown) and device support (3 vs 1). Combinations & Probabilities's advantage is update cadence (weekly vs every 5 weeks). On price there is nothing between them.

Both are free to download. Combinations & Probabilities sells 1 one-off in-app purchase. SIENG asks for nothing beyond the download.

Combinations & Probabilities ships an update weekly, SIENG every 5 weeks. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Combinations & Probabilities | SIENG |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 5 weeks |
| Size | 33 MB | 28 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [Joao Carrion](https://appshunter.io/developer/1044104256) | [Sengxay Xayachack](https://appshunter.io/developer/6772868315) |

## What reviewers say

### Combinations & Probabilities

[App page](https://appshunter.io/ios/app/combinations-and-probabilities/id6758729922)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| C&P Pro | $2.99 | one-time |


### SIENG

[App page](https://appshunter.io/ios/app/sieng/id6772868313)

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

**In-app purchases:** none


## Frequently asked questions

### Is Combinations & Probabilities free?

Combinations & Probabilities is free to download, with in-app purchases available.

### Is SIENG free?

SIENG is free to download, with no in-app purchases.

### Do Combinations & Probabilities or SIENG have ads?

Combinations & Probabilities shows ads; SIENG does not.

### Which is updated more often, Combinations & Probabilities or SIENG?

Combinations & Probabilities ships an update weekly, and SIENG every 5 weeks. Most recently, Combinations & Probabilities was updated on October 3, 2026 and SIENG on October 9, 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.*