# Units Free vs Pro Unit Converter

The clearest difference is review sentiment: Pro Unit Converter at 100% against Units Free's 0%. Pro Unit Converter also leads on update cadence (daily vs every 5 months) and monetization model (free vs free with in-app purchases). Units Free's advantage is iOS requirement (5.1.1 vs 11.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Units Free sells 1 one-off in-app purchase and Pro Unit Converter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Units Free ships an update every 5 months, Pro Unit Converter daily. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Units Free | Pro Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/units-free/id510615778/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Daily** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 3 MB | 37 MB |
| Requires iOS | **5.1.1** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Piet Jonas](https://appshunter.io/developer/288060167) | [Quang Tri Mai Nguyen](https://appshunter.io/developer/1626809833) |

## What reviewers say

### Units Free

[App page](https://appshunter.io/ios/app/units-free/id510615778)

Easily convert between various units across multiple categories like length, temperature, and weight. Access past conversions through a history list and send calculations via email. This free version offers core functionality with an option to upgrade for full category access.

**Highlights:** Multiple unit categories (length, temp, weight, etc.), Metric and imperial system support, Conversion history list, Send calculations via email, iPad multitasking support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Units Free Upgrade | $0.99 | one-time |


### Pro Unit Converter

[App page](https://appshunter.io/ios/app/pro-unit-converter/id6452273430)

This free utility app offers a quick and convenient way to convert various units with a beautiful and intuitive interface. Save frequently used conversions for easy access and convert everything from area and length to temperature and data.

**Highlights:** Multiple conversion categories, Save frequent conversions, Intuitive user interface, Quick input and results, Beautiful design

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove all Ads in the app | $0.99 | one-time |


## Frequently asked questions

### Is Units Free free?

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

### Is Pro Unit Converter free?

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

### Do Units Free or Pro Unit Converter have ads?

Neither Units Free nor Pro Unit Converter shows ads.

### Which is updated more often, Units Free or Pro Unit Converter?

Units Free ships an update every 5 months, and Pro Unit Converter daily. Most recently, Units Free was updated on October 24, 2026 and Pro Unit Converter on October 6, 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.*