# Unit Converter vs UnitStack

The clearest difference is rating: UnitStack at 5.0 against Unit Converter's 3.7. UnitStack also leads on in-app purchases (none vs 2). Unit Converter's advantage is update cadence (daily vs every 2 days) and ratings volume (3 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. Unit Converter sells 2 one-off in-app purchases. UnitStack asks for nothing beyond the download.

UnitStack holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Unit Converter ships an update daily, UnitStack every 2 days. The most recent releases landed on August 27, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Unit Converter | UnitStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/unit-converter-fromto/id6738796120/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/unitstack/id6757423947/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 days |
| Monetization | Free with in-app purchases | **Free** |
| Size | 55 MB | 4 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Farid Fakhnavar](https://appshunter.io/developer/1692223826) | [Michael Yang](https://appshunter.io/developer/1866843188) |

## What reviewers say

### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-fromto/id6738796120)

This versatile tool simplifies daily tasks by offering quick and reliable conversions for over 20 unit types. Its clean, intuitive interface makes converting measurements easy for students, professionals, and travelers alike. Enjoy offline functionality and a lightweight design that won't drain your device's resources.

**Highlights:** Over 20 unit categories, Length, weight, volume, temperature, speed, time, energy, pressure conversions, Real-time currency exchange rates, User-friendly interface, Lightweight and fast performance, Offline functionality

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro Sale | $6.99 | one-time |
| Lifetime Pro | $9.99 | 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.

### Which has better reviews, Unit Converter or UnitStack?

UnitStack is rated higher. Unit Converter averages 3.7 out of 5 from 3 ratings, while UnitStack averages 5.0 from 1 ratings.

### 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 daily, and UnitStack every 2 days. Most recently, Unit Converter was updated on August 27, 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.*