# Octuple Calc vs ProCalc

The clearest difference is in-app purchases: Octuple Calc at none against ProCalc's 4. Octuple Calc also leads on update cadence (every 2 weeks vs monthly). ProCalc's advantage is iOS requirement (13.0 vs 15.8.3). On price, ads and device support there is nothing between them.

Both are free to download. ProCalc sells 4 one-off in-app purchases. Octuple Calc asks for nothing beyond the download.

Octuple Calc ships an update every 2 weeks, ProCalc monthly. The most recent releases landed on October 28, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Octuple Calc | ProCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Monthly |
| Size | 36 MB | 34 MB |
| Requires iOS | 15.8.3 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [Penquinzoo Limited](https://appshunter.io/developer/1551454365) |

## 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


### ProCalc

[App page](https://appshunter.io/ios/app/procalc-calculator-app/id6756341509)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Flat themes | $3.99 | one-time |
| Graphs and pdf export. | $3.99 | one-time |
| Unlock Neon themes | $4.99 | one-time |
| All  themes | $4.99 | one-time |


## Frequently asked questions

### Is Octuple Calc free?

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

### Is ProCalc free?

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

### Do Octuple Calc or ProCalc have ads?

Both Octuple Calc and ProCalc show ads.

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

Octuple Calc ships an update every 2 weeks, and ProCalc monthly. Most recently, Octuple Calc was updated on October 28, 2026 and ProCalc on October 30, 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.*