# Unit Converter Calculator Pro vs Basic Unit Converter

The clearest difference is rating: Unit Converter Calculator Pro at 4.7 against Basic Unit Converter's 4.0. Unit Converter Calculator Pro also leads on ratings volume (977 vs 2). Basic Unit Converter's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Unit Converter Calculator Pro sells 4 one-off in-app purchases. Basic Unit Converter asks for nothing beyond the download.

Unit Converter Calculator Pro holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Unit Converter Calculator Pro has 977 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 76% of Unit Converter Calculator Pro's written reviews are positive against 100% of Basic Unit Converter's, so the app with the better star average is not the one people write more warmly about.

Unit Converter Calculator Pro ships an update monthly, Basic Unit Converter every 2 weeks. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Unit Converter Calculator Pro | Basic Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (977 ratings)](https://appshunter.io/ios/app/unit-converter-calculator-pro/id1343845631/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/basic-unit-converter/id1547306354/reviews) |
| Number of ratings | **977** | 2 |
| Positive reviews | 76.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 37 MB | 84 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rome Rock LLC](https://appshunter.io/developer/1190244007) | [Double Theory Ltd](https://appshunter.io/developer/1525279410) |

## 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


### Basic Unit Converter

[App page](https://appshunter.io/ios/app/basic-unit-converter/id1547306354)

Easily convert between various units of measurement across 12 categories including length, mass, temperature, and digital storage. Ideal for cooking, personal measurements, or general calculations.

**Highlights:** 12 conversion categories, Supports metric and imperial units, Instant calculation, Intuitive interface, Wide range of units

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

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter Calculator Pro free?

Unit Converter Calculator Pro is free to download, with in-app purchases available.

### Is Basic Unit Converter free?

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

### Which has better reviews, Unit Converter Calculator Pro or Basic Unit Converter?

Unit Converter Calculator Pro is rated higher. Unit Converter Calculator Pro averages 4.7 out of 5 from 977 ratings, while Basic Unit Converter averages 4.0 from 2 ratings.

### Do Unit Converter Calculator Pro or Basic Unit Converter have ads?

Unit Converter Calculator Pro shows ads; Basic Unit Converter does not.

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

Unit Converter Calculator Pro ships an update monthly, and Basic Unit Converter every 2 weeks. Most recently, Unit Converter Calculator Pro was updated on October 13, 2026 and Basic Unit Converter on October 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.*