# RGB Test vs ChangeUnits2

The clearest difference is price: RGB Test at Free against ChangeUnits2's $0.99. ChangeUnits2's advantage is ads (none vs shown) and update cadence (every 4 weeks vs every 8 months). On in-app purchases and device support there is nothing between them.

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

RGB Test ships an update every 8 months, ChangeUnits2 every 4 weeks. The most recent releases landed on September 16, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | RGB Test | ChangeUnits2 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/changeunits2/id1661260714/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 8 months | **Every 4 weeks** |
| Monetization | — | Paid |
| Size | 5 MB | 17 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Zbigniew Osada](https://appshunter.io/developer/911447642) | [Jack McCormack](https://appshunter.io/developer/1658121467) |

## What reviewers say

### RGB Test

[App page](https://appshunter.io/ios/app/rgb-test/id1084158696)

**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

**In-app purchases:** none


## Frequently asked questions

### Is RGB Test free?

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

### Is ChangeUnits2 free?

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

### Do RGB Test or ChangeUnits2 have ads?

RGB Test shows ads; ChangeUnits2 does not.

### Which is updated more often, RGB Test or ChangeUnits2?

RGB Test ships an update every 8 months, and ChangeUnits2 every 4 weeks. Most recently, RGB Test was updated on September 16, 2026 and ChangeUnits2 on June 1, 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.*