# iUnits Converter vs CompisCalculator Pro

The clearest difference is in-app purchases: iUnits Converter at none against CompisCalculator Pro's 1. iUnits Converter also leads on update cadence (every 6 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. CompisCalculator Pro sells 1 one-off in-app purchase. iUnits Converter asks for nothing beyond the download.

iUnits Converter ships an update every 6 days, CompisCalculator Pro every 3 weeks. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | iUnits Converter | CompisCalculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/compiscalculator-pro/id6451198443/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 3 weeks |
| Monetization | — | Free |
| Size | 6 MB | 3 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alessandro Manilii](https://appshunter.io/developer/743902887) | [Karl Noreland](https://appshunter.io/developer/1697120498) |

## What reviewers say

### iUnits Converter

[App page](https://appshunter.io/ios/app/iunits-converter/id1535769643)

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

**In-app purchases:** none


### CompisCalculator Pro

[App page](https://appshunter.io/ios/app/compiscalculator-pro/id6451198443)

A scientific calculator designed to enhance productivity with features like real-time results, unit conversion, and custom buttons. It offers a date calculator, customizable appearance, and is optimized for iPad.

**Highlights:** Real-time calculation results, Integrated unit and currency converter, Customizable buttons and functions, Date and time difference calculator, Calculation history, Customizable appearance, iPad optimization

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CompisCalculator premium | $2.49 | one-time |


## Frequently asked questions

### Is iUnits Converter free?

iUnits Converter is free to download, with no in-app purchases.

### Is CompisCalculator Pro free?

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

### Do iUnits Converter or CompisCalculator Pro have ads?

Neither iUnits Converter nor CompisCalculator Pro shows ads.

### Which is updated more often, iUnits Converter or CompisCalculator Pro?

iUnits Converter ships an update every 6 days, and CompisCalculator Pro every 3 weeks. Most recently, iUnits Converter was updated on October 8, 2026 and CompisCalculator Pro on October 24, 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.*