# Smart Unit Conversion vs Unit Converter & Currency

The clearest difference is update cadence: Unit Converter & Currency at every 4 months against Smart Unit Conversion's every 15 months. Smart Unit Conversion's advantage is iOS requirement (13.4 vs 15.6). On price, ads, 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 & Currency sells 3 in-app purchases, starting at $1.29 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 & Currency every 4 months. The most recent releases landed on May 16, 2026 and August 6, 2026 respectively.

## The numbers

| Metric | Smart Unit Conversion | Unit Converter & Currency |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/unit-converter-and-currency/id6479210637/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 15 months | **Every 4 months** |
| Monetization | — | Free with in-app purchases |
| Size | 41 MB | 35 MB |
| Requires iOS | **13.4** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Yui Lau](https://appshunter.io/developer/1791465155) | [长宏 侯](https://appshunter.io/developer/1726037103) |

## What reviewers say

### 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 |


### Unit Converter & Currency

[App page](https://appshunter.io/ios/app/unit-converter-and-currency/id6479210637)

This app offers a comprehensive unit conversion tool with a clean interface and extensive customization options. It supports offline use and includes a currency converter, making it a versatile utility for various conversion needs.

**Highlights:** Offline unit conversion, Currency converter, 32 unit categories, Convert as you type, Customizable units and formats, Dark and light modes, iCloud data sync

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Monthly) | $1.29 | per month |
| Pro (Yearly) | $12.99 | per year |
| Remove Ads | $2.99 | 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 & Currency free?

Unit Converter & Currency is free to download, with in-app purchases available.

### Do Smart Unit Conversion or Unit Converter & Currency have ads?

Both Smart Unit Conversion and Unit Converter & Currency show ads.

### Which is updated more often, Smart Unit Conversion or Unit Converter & Currency?

Smart Unit Conversion ships an update every 15 months, and Unit Converter & Currency every 4 months. Most recently, Smart Unit Conversion was updated on May 16, 2026 and Unit Converter & Currency on August 6, 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.*