# Unit Converter Calculator Pro vs Smart Unit Conversion

The clearest difference is update cadence: Unit Converter Calculator Pro at monthly against Smart Unit Conversion's every 15 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Unit Converter Calculator Pro sells 4 one-off in-app purchases 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 Calculator Pro ships an update monthly, Smart Unit Conversion every 15 months. The most recent releases landed on September 17, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Unit Converter Calculator Pro | Smart Unit Conversion |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (977 ratings)](https://appshunter.io/ios/app/unit-converter-calculator-pro/id1343845631/reviews)** | — |
| Number of ratings | **977** | — |
| Positive reviews | 76.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Monthly** | Every 15 months |
| Monetization | Free with in-app purchases | — |
| Size | 37 MB | 41 MB |
| Requires iOS | **13.0** | 13.4 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Rome Rock LLC](https://appshunter.io/developer/1190244007) | [Yui Lau](https://appshunter.io/developer/1791465155) |

## What reviewers say

### Unit Converter Calculator Pro

[App page](https://appshunter.io/ios/app/unit-converter-calculator-pro/id1343845631)

Easily convert between metric and imperial units for a wide range of measurements including area, speed, temperature, and weight. Supports scientific prefixes and offers a history of your conversions. No internet connection required.

**Highlights:** Metric to Imperial unit conversion, Imperial to Metric unit conversion, Area, speed, temperature, volume, weight conversions, Scientific prefixes support, Conversion history, Offline functionality

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads & Unlock Themes | $2.99 | one-time |
| Remove Ads & Unlock Themes 1 | $4.99 | one-time |
| Remove Ads & Unlock Themes 2 | $6.99 | one-time |
| Remove Ads & Unlock Themes 3 | $9.99 | one-time |

**What reviewers like**

- 🚀 Easy & accurate
- 🚀 Excellent Tool
- 👍 Goog for social
- 👍 Excelente para mi trabajo
- 👍 Sencillez

**What reviewers complain about**

- 👎 Hard to use interface
- 👎 Lacks pressure units
- 👎 No reverse button
- 👎 Metric to imperial format not user-friendly

**Reported bugs**

- 🐛 Changing to something else

**Requested features**

- 💡 Favorite conversations
- 💡 Color-coded sections
- 💡 Money conversion


### 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 Calculator Pro free?

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

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

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

Unit Converter Calculator Pro ships an update monthly, and Smart Unit Conversion every 15 months. Most recently, Unit Converter Calculator Pro was updated on September 17, 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.*