# Conversion Calculator Units vs All Unit Conversion

The clearest difference is in-app purchases: All Unit Conversion at none against Conversion Calculator Units's 1. All Unit Conversion also leads on ads (none vs shown). Conversion Calculator Units's advantage is review sentiment (82% vs 50%) and ratings volume (5K vs 17). On price, rating, update cadence and iOS requirement there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.7 for Conversion Calculator Units against 4.6 for All Unit Conversion. That said, the two scores are not equally well evidenced: Conversion Calculator Units has 5K ratings behind it against 17, so its average is the more settled of the two. Written reviews are what separate them: 82% of Conversion Calculator Units's written reviews are positive against 50% of All Unit Conversion's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 28, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Conversion Calculator Units | All Unit Conversion |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (5K ratings)](https://appshunter.io/ios/app/conversion-calculator-units/id727632233/reviews)** | [4.6 (17 ratings)](https://appshunter.io/ios/app/all-unit-conversion/id1418597453/reviews) |
| Number of ratings | **5K** | 17 |
| Positive reviews | **82.1% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 41 MB | 22 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [RV AppStudios LLC](https://appshunter.io/developer/340181308) | [Tiago Do Couto](https://appshunter.io/developer/1291604717) |

## 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


### All Unit Conversion

[App page](https://appshunter.io/ios/app/all-unit-conversion/id1418597453)

Easily convert between various units of measurement with this free utility app. It supports conversions for length, area, volume, mass, time, digital storage, energy, and currency.

**Highlights:** Length conversion, Area conversion, Volume conversion, Mass conversion, Time conversion, Currency conversion

**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 All Unit Conversion free?

All Unit Conversion is free to download, with no in-app purchases.

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

Conversion Calculator Units is rated higher. Conversion Calculator Units averages 4.7 out of 5 from 5K ratings, while All Unit Conversion averages 4.6 from 17 ratings.

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

Conversion Calculator Units shows ads; All Unit Conversion does not.

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

Conversion Calculator Units ships an update every 2 months, and All Unit Conversion every 2 months. Most recently, Conversion Calculator Units was updated on September 28, 2026 and All Unit Conversion on September 13, 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.*