# calcDS vs Combinations & Probabilities

The clearest difference is price: Combinations & Probabilities at Free against calcDS's $1.99. calcDS's advantage is in-app purchases (none vs 1) and ads (none vs shown).

Combinations & Probabilities is free to download; calcDS costs $1.99 up front. Combinations & Probabilities sells 1 one-off in-app purchase. calcDS asks for nothing beyond the download.

## The numbers

| Metric | calcDS | Combinations & Probabilities |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Weekly |
| Size | 3 MB | 33 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | +4 |
| Developer | [R.David Sisemore](https://appshunter.io/developer/990115240) | [Joao Carrion](https://appshunter.io/developer/1044104256) |

## What reviewers say

### calcDS

[App page](https://appshunter.io/ios/app/calcds/id6470944516)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is calcDS free?

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

### Is Combinations & Probabilities free?

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

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

Combinations & Probabilities shows ads; calcDS does not.

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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.*