# Units vs Conversion Calculator Units

The clearest difference is rating: Conversion Calculator Units at 4.7 against Units's 3.6. Conversion Calculator Units also leads on review sentiment (82% vs 60%) and ratings volume (5K vs 150). Units's advantage is update cadence (monthly vs every 2 months) and iOS requirement (13.5 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Units sells 3 one-off in-app purchases and Conversion Calculator Units sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Conversion Calculator Units holds the better App Store score, 4.7 against 3.6. That said, the two scores are not equally well evidenced: Conversion Calculator Units has 5K ratings behind it against 150, so its average is the more settled of the two. Written reviews point the same way: 60% of Units's written reviews are positive against 82% of Conversion Calculator Units's.

Units ships an update monthly, Conversion Calculator Units every 2 months. Both last shipped on September 25, 2026.

## The numbers

| Metric | Units | Conversion Calculator Units |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (150 ratings)](https://appshunter.io/ios/app/units-pro-unit-converter/id284574017/reviews) | **[4.7 (5K ratings)](https://appshunter.io/ios/app/conversion-calculator-units/id727632233/reviews)** |
| Number of ratings | 150 | **5K** |
| Positive reviews | 60.0% of reviews | **82.1% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 2 MB | 41 MB |
| Requires iOS | **13.5** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Homegrown Software Ltd](https://appshunter.io/developer/406645730) | [RV AppStudios LLC](https://appshunter.io/developer/340181308) |

## What reviewers say

### Units

[App page](https://appshunter.io/ios/app/units-pro-unit-converter/id284574017)

Easily convert between hundreds of units across 43 categories, including currency with daily updated rates. Customize your workflow by hiding or reordering units and categories.

**Highlights:** Hundreds of units across 43 categories, Daily updated currency exchange rates, Hide unused units, Reorder units and categories, Universal app support (iPhone, iPod touch, iPad)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Large Tip | $4.99 | one-time |

**What reviewers like**

- 🚀 Efficient and fast conversions
- 👍 Comprehensive list of units
- 🔍 Customizable unit selection
- 💰 Free app with optional paid version
- 🔧 Useful for engineering and technical work

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 🕰️ Outdated currency conversion rates
- 🔍 Too many unit categories, hard to navigate
- 💰 Ads in free version
- 📏 Ruler feature not accurate on some devices

**Reported bugs**

- Crashes when clearing input fields
- Numerical keypad covers conversion results
- Incompatibility issues with newer iOS versions
- Ruler measurements not accurate on all devices

**Requested features**

- Add nautical units (miles, knots)
- Improve currency conversion accuracy and updates
- Allow customization of visible unit categories
- Add more clothing/shoe size conversions
- Improve user interface and search functionality


### 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


## Frequently asked questions

### Is Units free?

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

### Is Conversion Calculator Units free?

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

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

Conversion Calculator Units is rated higher. Units averages 3.6 out of 5 from 150 ratings, while Conversion Calculator Units averages 4.7 from 5K ratings.

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

Both Units and Conversion Calculator Units show ads.

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

Units ships an update monthly, and Conversion Calculator Units every 2 months. Most recently, Units was updated on September 25, 2026 and Conversion Calculator Units on September 25, 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.*