# Octuple Calc vs Twin Calc

The clearest difference is in-app purchases: Octuple Calc at none against Twin Calc's 1. Octuple Calc also leads on device support (3 vs 1). Twin Calc's advantage is ads (none vs shown). On price and iOS requirement there is nothing between them.

Both are free to download. Twin Calc sells 1 one-off in-app purchase. Octuple Calc asks for nothing beyond the download.

## The numbers

| Metric | Octuple Calc | Twin Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | — |
| Size | 36 MB | 45 MB |
| Requires iOS | **15.8.3** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [Hiroki Sugiyama](https://appshunter.io/developer/6778858327) |

## What reviewers say

### Octuple Calc

[App page](https://appshunter.io/ios/app/octuple-calc/id6742039735)

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

**In-app purchases:** none


### Twin Calc

[App page](https://appshunter.io/ios/app/twin-calc-two-calculators/id6807615879)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO | $3.99 | one-time |


## Frequently asked questions

### Is Octuple Calc free?

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

### Is Twin Calc free?

Twin Calc is free to download, with in-app purchases available.

### Do Octuple Calc or Twin Calc have ads?

Octuple Calc shows ads; Twin Calc 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.*