# Unit Ⅽonverter vs Smart Unit Conversion

The clearest difference is update cadence: Unit Ⅽonverter at every 3 weeks against Smart Unit Conversion's every 15 months. Smart Unit Conversion's advantage is iOS requirement (13.4 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Unit Ⅽonverter sells 2 in-app purchases, starting at $1.99 per month and Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. Whichever you choose, the download price is not the number that matters.

Unit Ⅽonverter ships an update every 3 weeks, Smart Unit Conversion every 15 months. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Unit Ⅽonverter | Smart Unit Conversion |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 weeks** | Every 15 months |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 41 MB |
| Requires iOS | 18.0 | **13.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Polymath Company Limited](https://appshunter.io/developer/1072350394) | [Yui Lau](https://appshunter.io/developer/1791465155) |

## What reviewers say

### Unit Ⅽonverter

[App page](https://appshunter.io/ios/app/unit-onverter/id1499479393)

Easily convert between over 1600 units of measurement across 75 categories, including custom units and complex calculations. Supports offline mode and offers a convenient history of your conversions.

**Highlights:** Convert over 1600 units in 75 categories, Supports custom units and combinations, Calculator for expression input, View conversion histories, Add favorite units, Offline mode, Copy and share results

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UnitConverterPremiumMonthly | $1.99 | per month |
| UnitConverterPremiumLifeTime | $33.99 | one-time |


### 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 free?

Unit Ⅽonverter is free to download, with in-app purchases available.

### Is Smart Unit Conversion free?

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

### Do Unit Ⅽonverter or Smart Unit Conversion have ads?

Both Unit Ⅽonverter and Smart Unit Conversion show ads.

### Which is updated more often, Unit Ⅽonverter or Smart Unit Conversion?

Unit Ⅽonverter ships an update every 3 weeks, and Smart Unit Conversion every 15 months. Most recently, Unit Ⅽonverter was updated on October 12, 2026 and Smart Unit Conversion on October 8, 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.*