# Plus vs Pro Unit Converter

The clearest difference is price: Pro Unit Converter at Free against Plus's $0.49. Pro Unit Converter also leads on update cadence (daily vs every 9 days) and iOS requirement (11.0 vs 15.6). Plus's advantage is in-app purchases (none vs 1). On review sentiment, ads and device support there is nothing between them.

Pro Unit Converter is free to download; Plus costs $0.49 up front. Pro Unit Converter sells 1 one-off in-app purchase. Plus asks for nothing beyond the download.

Plus ships an update every 9 days, Pro Unit Converter daily. Both last shipped on November 3, 2026.

## The numbers

| Metric | Plus | Pro Unit Converter |
| --- | --- | --- |
| Price | $0.49 | **Free** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Daily** |
| Monetization | Paid | **Free** |
| Size | 18 MB | 37 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hidenori Nakashima](https://appshunter.io/developer/1566865415) | [Quang Tri Mai Nguyen](https://appshunter.io/developer/1626809833) |

## What reviewers say

### Plus

[App page](https://appshunter.io/ios/app/plus-sizing-tire-pressure-pro/id1566865413)

This app helps you determine the correct tire pressure for your vehicle based on various international standards. It supports multiple pressure units and highlights the benefits of proper inflation for performance, safety, and fuel efficiency.

**Highlights:** Selectable tire standards (XL, RFD, ETRTO, TRA, JATMA), Switchable pressure units (kPa, bar, kg/cm2, psi), Benefits of correct tire pressure explained, Guidance on checking tire pressure frequency, Supports iPhone and iPad

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

**In-app purchases:** none


### 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 Plus free?

Plus costs $0.49, with no in-app purchases.

### Is Pro Unit Converter free?

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

### Do Plus or Pro Unit Converter have ads?

Neither Plus nor Pro Unit Converter shows ads.

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

Plus ships an update every 9 days, and Pro Unit Converter daily. Most recently, Plus was updated on November 3, 2026 and Pro Unit Converter on November 3, 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.*