# Unit Converter vs METSIU

The clearest difference is in-app purchases: METSIU at none against Unit Converter's 12. METSIU also leads on ads (none vs shown). Unit Converter's advantage is update cadence (weekly vs every 6 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Unit Converter sells 12 in-app purchases, starting at $2.49 per month. METSIU asks for nothing beyond the download.

Unit Converter ships an update weekly, METSIU every 6 weeks. The most recent releases landed on September 24, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Unit Converter | METSIU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (14K ratings)](https://appshunter.io/ios/app/unit-converter-convert-all/id417794697/reviews)** | — |
| Number of ratings | **14K** | — |
| Positive reviews | 56.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 69 MB | 80 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [oWorld Software](https://appshunter.io/developer/291192797) | [MET GROUP SAS](https://appshunter.io/developer/1673619266) |

## What reviewers say

### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-convert-all/id417794697)

Easily convert between various units of measurement, including currencies, temperature, length, and weight. This intuitive tool provides real-time currency exchange rates and a comprehensive list of conversions for everyday use.

**Highlights:** Real-time currency conversions, Extensive unit categories (weight, temp, length, volume, etc.), Simple and intuitive interface, Supports international currencies, Includes time, speed, and IT units, Unlockable premium units

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium 1 month | $2.49 | per month |
| Unit Converter Premium - 1y | $8.99 | per year |
| Get premium | $14.99 | per year |
| Premium 1 year | $14.99 | per year |
| Conversion Calculator Pro - 1y | $19.99 | per year |
| Conversion clothing sizes 1y | $0.99 | one-time |
| Conversion liquids/volumes 1y | $0.99 | one-time |
| Remove Ads 1y | $0.99 | one-time |
| Conversion angles, forces 1y | $1.99 | one-time |
| Conversion of shoe sizes 1y | $1.99 | one-time |
| Currency Converter 1y | $1.99 | one-time |
| Convert all units + No ads | $29.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 🚀 Comprehensive unit conversions
- 👍 Helpful app
- 👍 Practical for engineering and mechanics
- 👍 Intuitive interface

**What reviewers complain about**

- 🔍 Too many ads
- 🔍 Ads make the app unusable
- 🔍 Ads are invasive and disrupt user experience
- 💰 Expensive subscription for ad-free version
- 🐛 Crashes and stability issues

**Reported bugs**

- Conversion calculations are sometimes inaccurate
- Inability to enter decimal values in some conversions
- Compatibility issues with newer devices

**Requested features**

- Dark mode option
- Favorites/frequently used units
- Improved ad-supported free version
- More customization options


### METSIU

[App page](https://appshunter.io/ios/app/metsiu/id6476941507)

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

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter free?

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

### Is METSIU free?

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

### Do Unit Converter or METSIU have ads?

Unit Converter shows ads; METSIU does not.

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

Unit Converter ships an update weekly, and METSIU every 6 weeks. Most recently, Unit Converter was updated on September 24, 2026 and METSIU on September 8, 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.*