# All Unit Conversion vs ChangeUnits2

The clearest difference is price: All Unit Conversion at Free against ChangeUnits2's $0.99. All Unit Conversion also leads on ratings volume (17 vs 1). ChangeUnits2's advantage is rating (5.0 vs 4.6) and update cadence (every 4 weeks vs every 2 months). On ads, in-app purchases and iOS requirement there is nothing between them.

All Unit Conversion is free to download; ChangeUnits2 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ChangeUnits2 holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: All Unit Conversion has 17 ratings behind it against 1, so its average is the more settled of the two.

All Unit Conversion ships an update every 2 months, ChangeUnits2 every 4 weeks. The most recent releases landed on October 17, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | All Unit Conversion | ChangeUnits2 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.6 (17 ratings)](https://appshunter.io/ios/app/all-unit-conversion/id1418597453/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/changeunits2/id1661260714/reviews)** |
| Number of ratings | **17** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | **Free** | Paid |
| Size | 22 MB | 17 MB |
| Requires iOS | 16.6 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tiago Do Couto](https://appshunter.io/developer/1291604717) | [Jack McCormack](https://appshunter.io/developer/1658121467) |

## What reviewers say

### All Unit Conversion

[App page](https://appshunter.io/ios/app/all-unit-conversion/id1418597453)

Easily convert between various units of measurement with this free utility app. It supports conversions for length, area, volume, mass, time, digital storage, energy, and currency.

**Highlights:** Length conversion, Area conversion, Volume conversion, Mass conversion, Time conversion, Currency conversion

**Features:** macOS Compatibility

**In-app purchases:** none


### ChangeUnits2

[App page](https://appshunter.io/ios/app/changeunits2/id1661260714)

This powerful utility app offers lightning-fast and accurate unit conversions for a wide range of needs. It includes advanced math functions, currency exchange, time zone tracking, and even chemical equation balancing. Designed for professionals and everyday users alike, it works offline and remembers your last calculations.

**Highlights:** Extreme speed and accuracy, Offline functionality, Currency exchange converter, Global time zone tracking, Advanced math functions, Chemical equation balancing, Last 33 calculations remembered

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

**In-app purchases:** none


## Frequently asked questions

### Is All Unit Conversion free?

All Unit Conversion is free to download, with no in-app purchases.

### Is ChangeUnits2 free?

ChangeUnits2 costs $0.99, with no in-app purchases.

### Which has better reviews, All Unit Conversion or ChangeUnits2?

ChangeUnits2 is rated higher. All Unit Conversion averages 4.6 out of 5 from 17 ratings, while ChangeUnits2 averages 5.0 from 1 ratings.

### Do All Unit Conversion or ChangeUnits2 have ads?

Neither All Unit Conversion nor ChangeUnits2 shows ads.

### Which is updated more often, All Unit Conversion or ChangeUnits2?

All Unit Conversion ships an update every 2 months, and ChangeUnits2 every 4 weeks. Most recently, All Unit Conversion was updated on October 17, 2026 and ChangeUnits2 on October 19, 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.*