# Conversion Calculator Units vs inch mm converter

The clearest difference is in-app purchases: inch mm converter at none against Conversion Calculator Units's 1. inch mm converter also leads on iOS requirement (11.0 vs 15.0). Conversion Calculator Units's advantage is update cadence (every 2 months vs every 12 months) and ratings volume (5K vs 175). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. Conversion Calculator Units sells 1 one-off in-app purchase. inch mm converter asks for nothing beyond the download.

Conversion Calculator Units holds the better App Store score, 4.7 against 4.6. That said, the two scores are not equally well evidenced: Conversion Calculator Units has 5K ratings behind it against 175, so its average is the more settled of the two. Written reviews split almost evenly too, at 82% and 82% positive.

Conversion Calculator Units ships an update every 2 months, inch mm converter every 12 months. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Conversion Calculator Units | inch mm converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (5K ratings)](https://appshunter.io/ios/app/conversion-calculator-units/id727632233/reviews)** | [4.6 (175 ratings)](https://appshunter.io/ios/app/inch-mm-converter/id6740137317/reviews) |
| Number of ratings | **5K** | 175 |
| Positive reviews | 82.1% of reviews | **82.4% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 months** | Every 12 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 41 MB | 12 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RV AppStudios LLC](https://appshunter.io/developer/340181308) | [SDG CODE DOO NIS](https://appshunter.io/developer/1343251532) |

## 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


### inch mm converter

[App page](https://appshunter.io/ios/app/inch-mm-converter/id6740137317)

Easily convert measurements between inches and millimeters. This straightforward tool simplifies length conversions for everyday use.

**Highlights:** Inch to millimeter conversion, Millimeter to inch conversion, Easy to use interface, Simple measurement tool

**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 inch mm converter free?

inch mm converter is free to download, with no in-app purchases.

### Which has better reviews, Conversion Calculator Units or inch mm converter?

Conversion Calculator Units is rated higher. Conversion Calculator Units averages 4.7 out of 5 from 5K ratings, while inch mm converter averages 4.6 from 175 ratings.

### Do Conversion Calculator Units or inch mm converter have ads?

Both Conversion Calculator Units and inch mm converter show ads.

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

Conversion Calculator Units ships an update every 2 months, and inch mm converter every 12 months. Most recently, Conversion Calculator Units was updated on October 28, 2026 and inch mm converter on October 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.*