# Converter vs US Unit Converter

Converter and US Unit Converter both sit at 4.9 stars, but that hides the real split: 96% of Converter's written reviews are positive against 44% of US Unit Converter's. Converter also leads on in-app purchases (none vs 1) and ads (none vs shown). On price, rating, device support and iOS requirement there is nothing between them.

Both are free to download. US Unit Converter sells 1 one-off in-app purchase. Converter asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Converter against 4.8 for US Unit Converter. That said, the two scores are not equally well evidenced: Converter has 897 ratings behind it against 108, so its average is the more settled of the two. Written reviews are what separate them: 96% of Converter's written reviews are positive against 44% of US Unit Converter's.

Converter ships an update every 2 months, US Unit Converter every 6 months. The most recent releases landed on September 21, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Converter | US Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (897 ratings)](https://appshunter.io/ios/app/converter-universal-conversion/id423521445/reviews)** | [4.8 (108 ratings)](https://appshunter.io/ios/app/us-unit-converter/id1577905442/reviews) |
| Number of ratings | **897** | 108 |
| Positive reviews | **96.0% of reviews** | 44.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 37 MB | 6 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Kei Suefuji](https://appshunter.io/developer/1388335881) |

## What reviewers say

### Converter

[App page](https://appshunter.io/ios/app/converter-universal-conversion/id423521445)

This app offers a comprehensive unit and hardness conversion tool with an easy-to-use interface. It includes currency conversion with updated exchange rates, over 300 engineering and scientific units, and a specialized hardness converter. Additional features like timezone conversion, pace calculation, and a standard calculator enhance its utility.

**Highlights:** Currency converter with live exchange rates, Over 300 engineering and scientific units, Specialized hardness converter, Timezone conversion, Running pace calculator, Integrated standard calculator, Conversion history log

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Accurate and fast conversions
- 💡 Comprehensive coverage of units and categories
- 🔒 No ads or hidden fees
- 💡 Useful currency converter

**What reviewers complain about**

- 🐛 Currency conversion rates can be outdated
- 🔍 Difficult to find specific conversions due to large number of options
- 💡 Lack of ability to set favorite conversions as default

**Reported bugs**

- Occasional crashes on startup for non-English/German users
- Conversion from meters to feet does not show inches

**Requested features**

- Add fuel efficiency conversions
- Allow users to set favorite conversions as default
- Improve currency conversion rate updates


### US Unit Converter

[App page](https://appshunter.io/ios/app/us-unit-converter/id1577905442)

Easily convert between US customary units and the International System of Units for various measurements like length, weight, area, volume, and temperature. Access conversion history and remove ads with a premium upgrade.

**Highlights:** Length conversion, Weight conversion, Area conversion, Liquid volume conversion, Temperature conversion, Conversion history, Ad-free option

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PREMIUM | $3.99 | one-time |


## Frequently asked questions

### Is Converter free?

Converter is free to download, with no in-app purchases.

### Is US Unit Converter free?

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

### Which has better reviews, Converter or US Unit Converter?

Converter is rated higher. Converter averages 4.9 out of 5 from 897 ratings, while US Unit Converter averages 4.8 from 108 ratings.

### Do Converter or US Unit Converter have ads?

US Unit Converter shows ads; Converter does not.

### Which is updated more often, Converter or US Unit Converter?

Converter ships an update every 2 months, and US Unit Converter every 6 months. Most recently, Converter was updated on September 21, 2026 and US Unit Converter on September 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*