# CalcTooi vs Octuple Calc

The clearest difference is in-app purchases: Octuple Calc at none against CalcTooi's 1. Octuple Calc also leads on device support (3 vs 1) and iOS requirement (15.8.3 vs 17.0). CalcTooi's advantage is ads (none vs shown). On price and update cadence there is nothing between them.

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

CalcTooi ships an update weekly, Octuple Calc every 2 weeks. The most recent releases landed on September 11, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | CalcTooi | Octuple Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 2 weeks |
| Size | 6 MB | 36 MB |
| Requires iOS | 17.0 | **15.8.3** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [S.H.Y Art&Tech Office](https://appshunter.io/developer/1766104332) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### CalcTooi

[App page](https://appshunter.io/ios/app/calctooi/id6738410401)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy a Coffee | $3.00 | one-time |


### Octuple Calc

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

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

**In-app purchases:** none


## Frequently asked questions

### Is CalcTooi free?

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

### Is Octuple Calc free?

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

### Do CalcTooi or Octuple Calc have ads?

Octuple Calc shows ads; CalcTooi does not.

### Which is updated more often, CalcTooi or Octuple Calc?

CalcTooi ships an update weekly, and Octuple Calc every 2 weeks. Most recently, CalcTooi was updated on September 11, 2026 and Octuple Calc on September 28, 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.*