# Conversion Calculator Units vs Mass Converter

The clearest difference is price: Conversion Calculator Units at Free against Mass Converter's $1.99. Conversion Calculator Units also leads on update cadence (every 2 months vs every 37 months) and ratings volume (5K vs 8). Mass Converter's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Conversion Calculator Units is free to download; Mass Converter costs $1.99 up front. Conversion Calculator Units sells 1 one-off in-app purchase. Mass Converter asks for nothing beyond the download.

Mass Converter holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Conversion Calculator Units has 5K ratings behind it against 8, so its average is the more settled of the two.

Conversion Calculator Units ships an update every 2 months, Mass Converter every 37 months. The most recent releases landed on October 17, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Conversion Calculator Units | Mass Converter |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [4.7 (5K ratings)](https://appshunter.io/ios/app/conversion-calculator-units/id727632233/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/mass-converter/id1537119048/reviews)** |
| Number of ratings | **5K** | 8 |
| Positive reviews | 82.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 37 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 41 MB | 0 MB |
| Requires iOS | 15.0 | **13.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RV AppStudios LLC](https://appshunter.io/developer/340181308) | [Anna Filobok](https://appshunter.io/developer/1613515832) |

## What reviewers say

### Conversion Calculator Units

[App page](https://appshunter.io/ios/app/conversion-calculator-units/id727632233)

This app offers a simple and powerful way to convert between over 140 units across 12 categories. Easily switch between units, customize your experience with themes, and share your results.

**Highlights:** Converts over 140 units, Supports 12 conversion categories, Customizable themes, Drag and set unit positions, Add units to favorites, Share converted units via email

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 👍 User-friendly
- 🚀 Easy to use
- 💡 Helpful for learning metric system
- 👍 Great for conversions
- 👍 Intuitive interface

**What reviewers complain about**

- 🐛 Ads disrupt usage
- 🐛 Difficult to change units
- 🐛 Lacks portrait mode
- 🐛 Upside-down orientation issues
- 🐛 Cluttered UI design

**Reported bugs**

- Ads not removed after purchase
- Incorrect unit conversions

**Requested features**

- Add pressure conversion units
- Include a basic calculator function
- Implement multi-language support
- Allow customization of unit order


### Mass Converter

[App page](https://appshunter.io/ios/app/mass-converter/id1537119048)

Easily convert between various units of mass, including stone, pounds, kilograms, grams, quintals, and tonnes. This utility is designed for quick and accurate conversions for everyday use.

**Highlights:** Convert Stone (St), Convert Pound (Lb), Convert Kilogram (Kg), Convert Gram (G), Convert Quintal (Q), Convert Tonne (T)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Conversion Calculator Units free?

Conversion Calculator Units is free to download, with in-app purchases available.

### Is Mass Converter free?

Mass Converter costs $1.99, with no in-app purchases.

### Which has better reviews, Conversion Calculator Units or Mass Converter?

Mass Converter is rated higher. Conversion Calculator Units averages 4.7 out of 5 from 5K ratings, while Mass Converter averages 5.0 from 8 ratings.

### Do Conversion Calculator Units or Mass Converter have ads?

Conversion Calculator Units shows ads; Mass Converter does not.

### Which is updated more often, Conversion Calculator Units or Mass Converter?

Conversion Calculator Units ships an update every 2 months, and Mass Converter every 37 months. Most recently, Conversion Calculator Units was updated on October 17, 2026 and Mass Converter on September 28, 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.*