# Conversion vs Unit Converter Calculator Pro

The clearest difference is price: Unit Converter Calculator Pro at Free against Conversion's $0.99. Unit Converter Calculator Pro also leads on rating (4.7 vs 3.0) and ratings volume (977 vs 5). Conversion's advantage is in-app purchases (none vs 4) and ads (none vs shown).

Unit Converter Calculator Pro is free to download; Conversion costs $0.99 up front. Unit Converter Calculator Pro sells 4 one-off in-app purchases. Conversion asks for nothing beyond the download.

Unit Converter Calculator Pro holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Unit Converter Calculator Pro has 977 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 61% of Conversion's written reviews are positive against 76% of Unit Converter Calculator Pro's.

Conversion ships an update every 2 months, Unit Converter Calculator Pro monthly. The most recent releases landed on October 12, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Conversion | Unit Converter Calculator Pro |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.0 (5 ratings)](https://appshunter.io/ios/app/conversion-unit-converter/id286552073/reviews) | **[4.7 (977 ratings)](https://appshunter.io/ios/app/unit-converter-calculator-pro/id1343845631/reviews)** |
| Number of ratings | 5 | **977** |
| Positive reviews | 61.0% of reviews | **76.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 37 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Duncan Campbell](https://appshunter.io/developer/286552076) | [Rome Rock LLC](https://appshunter.io/developer/1190244007) |

## What reviewers say

### Conversion

[App page](https://appshunter.io/ios/app/conversion-unit-converter/id286552073)

This utility app provides instant conversions between a wide range of units, including metric, imperial, and currency. It features live exchange rates and supports 33 languages, all within a clean, clutter-free interface.

**Highlights:** Extensive unit categories (12 categories, 96 units), Live, offline-capable currency exchange rates, Supports 33 languages and regional number formats, Modern, clutter-free interface with fluid animations, Full VoiceOver and accessibility support, No ads, analytics, or tracking

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Conversion free?

Conversion costs $0.99, with no in-app purchases.

### Is Unit Converter Calculator Pro free?

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

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

Unit Converter Calculator Pro is rated higher. Conversion averages 3.0 out of 5 from 5 ratings, while Unit Converter Calculator Pro averages 4.7 from 977 ratings.

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

Unit Converter Calculator Pro shows ads; Conversion does not.

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

Conversion ships an update every 2 months, and Unit Converter Calculator Pro monthly. Most recently, Conversion was updated on October 12, 2026 and Unit Converter Calculator Pro on October 18, 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.*