# Permutation and Combination vs Safe UTulsa

The clearest difference is update cadence: Safe UTulsa at every 3 months against Permutation and Combination's every 40 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Permutation and Combination ships an update every 40 months, Safe UTulsa every 3 months. The most recent releases landed on September 10, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Permutation and Combination | Safe UTulsa |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (13 ratings)](https://appshunter.io/ios/app/permutation-and-combination/id1006634963/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 44.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 40 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 23 MB | 28 MB |
| Requires iOS | **12.1** | 13.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Keiji Matsui](https://appshunter.io/developer/365287272) | [The University of Tulsa](https://appshunter.io/developer/370385309) |

## What reviewers say

### Permutation and Combination

[App page](https://appshunter.io/ios/app/permutation-and-combination/id1006634963)

Easily calculate permutations and combinations with this educational tool. It provides a straightforward way to solve mathematical problems related to arrangements and selections.

**Highlights:** Calculate permutations, Calculate combinations, Easy to use interface, Educational tool

**Features:** macOS Compatibility

**In-app purchases:** none


### Safe UTulsa

[App page](https://appshunter.io/ios/app/safe-utulsa/id6529523966)

**In-app purchases:** none


## Frequently asked questions

### Is Permutation and Combination free?

Permutation and Combination is free to download, with no in-app purchases.

### Is Safe UTulsa free?

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

### Do Permutation and Combination or Safe UTulsa have ads?

Neither Permutation and Combination nor Safe UTulsa shows ads.

### Which is updated more often, Permutation and Combination or Safe UTulsa?

Permutation and Combination ships an update every 40 months, and Safe UTulsa every 3 months. Most recently, Permutation and Combination was updated on September 10, 2026 and Safe UTulsa on September 6, 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.*