# Permutation Combination vs One Number Tools

The clearest difference is in-app purchases: Permutation Combination at none against One Number Tools's 6. Permutation Combination also leads on iOS requirement (12.0 vs 17.6). One Number Tools's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. One Number Tools sells 6 in-app purchases, starting at $1.99 per month. Permutation Combination asks for nothing beyond the download.

Permutation Combination ships an update every 2 days, One Number Tools every 3 days. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Permutation Combination | One Number Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/permutation-combination/id6448662601/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 3 days |
| Monetization | Ad-supported | — |
| Size | 31 MB | 29 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HIWAZERO](https://appshunter.io/developer/1621048794) | [宇 黄](https://appshunter.io/developer/1812371518) |

## What reviewers say

### Permutation Combination

[App page](https://appshunter.io/ios/app/permutation-combination/id6448662601)

Easily calculate permutations and combinations for mathematics and statistics. This tool simplifies complex calculations, helping users save time and improve accuracy in exams and studies.

**Highlights:** Permutation calculations, Combination calculations, Time-saving for exams, Mathematical and statistical use, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


### One Number Tools

[App page](https://appshunter.io/ios/app/one-number-tools/id6745723003)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1个月订阅 | $1.99 | per month |
| 1周订阅 | $2.59 | per 7 days |
| 1年订阅 | $11.00 | per year |
| 1天会员 | $0.99 | one-time |
| 1年订阅 | $9.99 | one-time |
| 5年会员订阅 | $39.99 | one-time |


## Frequently asked questions

### Is Permutation Combination free?

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

### Is One Number Tools free?

One Number Tools is free to download, with in-app purchases available.

### Do Permutation Combination or One Number Tools have ads?

Permutation Combination shows ads; One Number Tools does not.

### Which is updated more often, Permutation Combination or One Number Tools?

Permutation Combination ships an update every 2 days, and One Number Tools every 3 days. Most recently, Permutation Combination was updated on November 3, 2026 and One Number Tools on November 8, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*