# Pro Unit Converter vs UnitStack

The clearest difference is in-app purchases: UnitStack at none against Pro Unit Converter's 1. Pro Unit Converter's advantage is update cadence (daily vs every 2 days) and iOS requirement (11.0 vs 18.6). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Pro Unit Converter sells 1 one-off in-app purchase. UnitStack asks for nothing beyond the download.

Pro Unit Converter ships an update daily, UnitStack every 2 days. The most recent releases landed on September 18, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Pro Unit Converter | UnitStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/unitstack/id6757423947/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 days |
| Monetization | Free | Free |
| Size | 37 MB | 4 MB |
| Requires iOS | **11.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Quang Tri Mai Nguyen](https://appshunter.io/developer/1626809833) | [Michael Yang](https://appshunter.io/developer/1866843188) |

## What reviewers say

### 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 |


### UnitStack

[App page](https://appshunter.io/ios/app/unitstack/id6757423947)

This utility app allows for simultaneous unit and currency conversions, saving your progress and custom units. Its minimalist design ensures a clear and efficient user experience for all your measurement needs.

**Highlights:** Stack multiple conversions, Persistent values, Custom units of measure, Minimalist interface, Custom color themes, Currency conversion

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pro Unit Converter free?

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

### Is UnitStack free?

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

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

Neither Pro Unit Converter nor UnitStack shows ads.

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

Pro Unit Converter ships an update daily, and UnitStack every 2 days. Most recently, Pro Unit Converter was updated on September 18, 2026 and UnitStack on September 17, 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.*