# Unit Converter HD. vs Convertology

The clearest difference is rating: Unit Converter HD. at 4.7 against Convertology's 4.0. Unit Converter HD. also leads on ratings volume (644 vs 1) and device support (3 vs 1). Convertology's advantage is update cadence (every 6 days vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Unit Converter HD. sells 1 one-off in-app purchase and Convertology sells 2 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Unit Converter HD. holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Unit Converter HD. has 644 ratings behind it against 1, so its average is the more settled of the two.

Unit Converter HD. ships an update every 2 months, Convertology every 6 days. The most recent releases landed on October 20, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Unit Converter HD. | Convertology |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (644 ratings)](https://appshunter.io/ios/app/unit-converter-hd/id481973377/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/convertology/id6764801500/reviews) |
| Number of ratings | **644** | 1 |
| Positive reviews | 93.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 6 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 86 MB | 53 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [良峰 侯](https://appshunter.io/developer/654444245) | [ADNAN STRUJIC](https://appshunter.io/developer/1895920092) |

## 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


### Convertology

[App page](https://appshunter.io/ios/app/convertology/id6764801500)

This utility app offers precise unit conversions across a vast range of categories, from everyday measurements to specialized scientific and engineering units. It features a clean interface with quick search, favorites, history, and adjustable precision for efficient use in various settings.

**Highlights:** Extensive unit categories, Quick unit search, Favorites and history, Adjustable result precision, Light and dark mode interface, Copy and share results

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $3.99 | per 7 days |
| Yearly Premium | $29.99 | per year |


## Frequently asked questions

### Is Unit Converter HD. free?

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

### Is Convertology free?

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

### Which has better reviews, Unit Converter HD. or Convertology?

Unit Converter HD. is rated higher. Unit Converter HD. averages 4.7 out of 5 from 644 ratings, while Convertology averages 4.0 from 1 ratings.

### Do Unit Converter HD. or Convertology have ads?

Both Unit Converter HD. and Convertology show ads.

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

Unit Converter HD. ships an update every 2 months, and Convertology every 6 days. Most recently, Unit Converter HD. was updated on October 20, 2026 and Convertology on October 19, 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.*