# Unit Converter HD. vs All Unit Conversion

Unit Converter HD. and All Unit Conversion both sit at 4.7 stars, but that hides the real split: 94% of Unit Converter HD.'s written reviews are positive against 50% of All Unit Conversion's. Unit Converter HD. also leads on ratings volume (644 vs 17) and device support (3 vs 1). All Unit Conversion's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, rating and update cadence there is nothing between them.

Both are free to download. Unit Converter HD. 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 Unit Converter HD. against 4.6 for All Unit Conversion. That said, the two scores are not equally well evidenced: Unit Converter HD. has 644 ratings behind it against 17, so its average is the more settled of the two. Written reviews are what separate them: 94% of Unit Converter HD.'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 October 20, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Unit Converter HD. | All Unit Conversion |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (644 ratings)](https://appshunter.io/ios/app/unit-converter-hd/id481973377/reviews)** | [4.6 (17 ratings)](https://appshunter.io/ios/app/all-unit-conversion/id1418597453/reviews) |
| Number of ratings | **644** | 17 |
| Positive reviews | **93.8% 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 | 86 MB | 22 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [良峰 侯](https://appshunter.io/developer/654444245) | [Tiago Do Couto](https://appshunter.io/developer/1291604717) |

## What reviewers say

### Unit Converter HD.

[App page](https://appshunter.io/ios/app/unit-converter-hd/id481973377)

Easily convert over 700 units across 30 categories with this powerful tool. It offers a user-friendly interface, dark mode support, and a backspace key for quick corrections. Save time on all your measurement conversion needs.

**Highlights:** 700+ Units of Measure, 30 Conversion Categories, Easy-to-Use Interface, Dark Mode Support, Backspace Key

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

**In-app purchases (1)**

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

**What reviewers like**

- 👍 Easy to use
- 🚀 Handy and convenient
- 💡 Comprehensive set of conversions
- 🚀 Very useful app
- 👍 Intuitive design

**What reviewers complain about**

- 🐛 Occasional crashes or freezing issues
- 💡 Could be more intuitive for some users
- 🔒 Requires horizontal orientation

**Reported bugs**

- Freezing or crashing on some devices
- Display issues with certain units

**Requested features**

- Add support for US weights (tons, lbs., oz.)
- Implement portrait mode support
- Provide more customization options


### 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 Unit Converter HD. free?

Unit Converter HD. 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, Unit Converter HD. or All Unit Conversion?

Unit Converter HD. is rated higher. Unit Converter HD. averages 4.7 out of 5 from 644 ratings, while All Unit Conversion averages 4.6 from 17 ratings.

### Do Unit Converter HD. or All Unit Conversion have ads?

Unit Converter HD. shows ads; All Unit Conversion does not.

### Which is updated more often, Unit Converter HD. or All Unit Conversion?

Unit Converter HD. ships an update every 2 months, and All Unit Conversion every 2 months. Most recently, Unit Converter HD. was updated on October 20, 2026 and All Unit Conversion on October 17, 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.*