# Unit Converter vs UnitStack

The clearest difference is in-app purchases: UnitStack at none against Unit Converter's 1. UnitStack also leads on update cadence (every 2 days vs every 2 weeks). Unit Converter's advantage is iOS requirement (12.0 vs 18.6). On price, ads and device support there is nothing between them.

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

Unit Converter ships an update every 2 weeks, UnitStack every 2 days. The most recent releases landed on September 7, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Unit Converter | UnitStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/unitstack/id6757423947/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | — | Free |
| Size | 29 MB | 4 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [伟鹏 李](https://appshunter.io/developer/1817642925) | [Michael Yang](https://appshunter.io/developer/1866843188) |

## What reviewers say

### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-easyunit/id6754090225)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Premium Membership | $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 Unit Converter free?

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 Unit Converter or UnitStack have ads?

Neither Unit Converter nor UnitStack shows ads.

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

Unit Converter ships an update every 2 weeks, and UnitStack every 2 days. Most recently, Unit Converter was updated on September 7, 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.*