# Unit Converter Pro Calculator vs Smart Unit Conversion

The clearest difference is in-app purchases: Unit Converter Pro Calculator at none against Smart Unit Conversion's 1. Unit Converter Pro Calculator also leads on update cadence (every 3 weeks vs every 15 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. Unit Converter Pro Calculator asks for nothing beyond the download.

Unit Converter Pro Calculator ships an update every 3 weeks, Smart Unit Conversion every 15 months. The most recent releases landed on September 10, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Unit Converter Pro Calculator | Smart Unit Conversion |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 weeks** | Every 15 months |
| Size | 32 MB | 41 MB |
| Requires iOS | **13.0** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Barnasoba, S.L.](https://appshunter.io/developer/1823395954) | [Yui Lau](https://appshunter.io/developer/1791465155) |

## What reviewers say

### Unit Converter Pro Calculator

[App page](https://appshunter.io/ios/app/unit-converter-pro-calculator/id1488398127)

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

**In-app purchases:** none


### Smart Unit Conversion

[App page](https://appshunter.io/ios/app/smart-unit-conversion/id1643381985)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Year | $1.99 | per year |


## Frequently asked questions

### Is Unit Converter Pro Calculator free?

Unit Converter Pro Calculator is free to download, with no in-app purchases.

### Is Smart Unit Conversion free?

Smart Unit Conversion is free to download, with in-app purchases available.

### Do Unit Converter Pro Calculator or Smart Unit Conversion have ads?

Both Unit Converter Pro Calculator and Smart Unit Conversion show ads.

### Which is updated more often, Unit Converter Pro Calculator or Smart Unit Conversion?

Unit Converter Pro Calculator ships an update every 3 weeks, and Smart Unit Conversion every 15 months. Most recently, Unit Converter Pro Calculator was updated on September 10, 2026 and Smart Unit Conversion on May 16, 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.*