# CONVERT UNITS vs Voith DRIVE

The clearest difference is in-app purchases: Voith DRIVE at none against CONVERT UNITS's 2. Voith DRIVE also leads on ads (none vs shown). CONVERT UNITS's advantage is update cadence (weekly vs every 3 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. CONVERT UNITS sells 2 in-app purchases, starting at $0.99 per month. Voith DRIVE asks for nothing beyond the download.

CONVERT UNITS ships an update weekly, Voith DRIVE every 3 weeks. The most recent releases landed on October 16, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | CONVERT UNITS | Voith DRIVE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.4K ratings)](https://appshunter.io/ios/app/convert-units/id1114969241/reviews)** | — |
| Number of ratings | **1.4K** | — |
| Positive reviews | 75.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Ad-supported | — |
| Size | 22 MB | 34 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Adysseus](https://appshunter.io/developer/447444997) | [Voith Digital Solutions Inc](https://appshunter.io/developer/1281566238) |

## What reviewers say

### CONVERT UNITS

[App page](https://appshunter.io/ios/app/convert-units/id1114969241)

Easily convert between various units of measurement including length, weight, temperature, and currency. Features automatic currency updates, a vast selection of currencies, and customizable display options for accuracy and rounding. Optimized for multitasking on iPad and offers a beautiful dark design.

**Highlights:** Converts length, weight, speed, area, time, pressure, volume, power, fuel, temperature, data, and currency, Automatic currency updates, 160 currencies available, Multitasking enabled for iPad, Alphabetical quick links for units, Customizable startup categories, Adjustable accuracy and rounding

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $0.99 | per month |
| Remove ads | $19.99 | one-time |

**What reviewers like**

- 👍 Quick & easy to use
- 👍 Ease of use
- 👍 Simple and easy to use
- 👍 Well thought out and easy to use
- 👍 Excellent and very reliable

**What reviewers complain about**

- 🐛 Ads obstruct use
- 🐛 Subscription required to remove ads
- 🐛 Currency conversion not working

**Reported bugs**

- App got stuck, required uninstall/reinstall to fix
- Navigation issues, unable to get back to home page

**Requested features**

- Option to convert between functions (length to volume)
- Remember last conversion settings for each category


### Voith DRIVE

[App page](https://appshunter.io/ios/app/voith-drive/id6761454624)

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

**In-app purchases:** none


## Frequently asked questions

### Is CONVERT UNITS free?

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

### Is Voith DRIVE free?

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

### Do CONVERT UNITS or Voith DRIVE have ads?

CONVERT UNITS shows ads; Voith DRIVE does not.

### Which is updated more often, CONVERT UNITS or Voith DRIVE?

CONVERT UNITS ships an update weekly, and Voith DRIVE every 3 weeks. Most recently, CONVERT UNITS was updated on October 16, 2026 and Voith DRIVE on September 28, 2026.

---

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