# Smart Unit Conversion vs Unit Converter All Categories

The clearest difference is ads: Unit Converter All Categories at none against Smart Unit Conversion's shown. Unit Converter All Categories also leads on update cadence (every 5 weeks vs every 15 months). Smart Unit Conversion's advantage is iOS requirement (13.4 vs 16.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year and Unit Converter All Categories sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Smart Unit Conversion ships an update every 15 months, Unit Converter All Categories every 5 weeks. Both last shipped on November 7, 2026.

## The numbers

| Metric | Smart Unit Conversion | Unit Converter All Categories |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 15 months | **Every 5 weeks** |
| Size | 41 MB | 12 MB |
| Requires iOS | **13.4** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Yui Lau](https://appshunter.io/developer/1791465155) | [Vladislav Zhirnov](https://appshunter.io/developer/1476188065) |

## What reviewers say

### Smart Unit Conversion

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

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

**In-app purchases (1)**

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


### Unit Converter All Categories

[App page](https://appshunter.io/ios/app/unit-converter-all-categories/id6747321259)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version / monthly | $0.99 | per month |
| Full version / year | $2.99 | per year |
| Remove ADS | $4.99 | one-time |


## Frequently asked questions

### Is Smart Unit Conversion free?

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

### Is Unit Converter All Categories free?

Unit Converter All Categories is free to download, with in-app purchases available.

### Do Smart Unit Conversion or Unit Converter All Categories have ads?

Smart Unit Conversion shows ads; Unit Converter All Categories does not.

### Which is updated more often, Smart Unit Conversion or Unit Converter All Categories?

Smart Unit Conversion ships an update every 15 months, and Unit Converter All Categories every 5 weeks. Most recently, Smart Unit Conversion was updated on November 7, 2026 and Unit Converter All Categories on November 7, 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.*