# Double Unit Converter vs Convert Rai

The clearest difference is price: Double Unit Converter at Free against Convert Rai's $0.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Double Unit Converter is free to download; Convert Rai costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Double Unit Converter ships an update monthly, Convert Rai every 4 weeks. Both last shipped on October 19, 2026.

## The numbers

| Metric | Double Unit Converter | Convert Rai |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 weeks** |
| Size | 9 MB | 17 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MIHAIL MILUSHEV](https://appshunter.io/developer/648847538) | [Khanin Chomphusri](https://appshunter.io/developer/1657583243) |

## What reviewers say

### Double Unit Converter

[App page](https://appshunter.io/ios/app/double-unit-converter/id1451391414)

**Features:** macOS Compatibility

**In-app purchases:** none


### Convert Rai

[App page](https://appshunter.io/ios/app/convert-rai/id6444877065)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Double Unit Converter free?

Double Unit Converter is free to download, with no in-app purchases.

### Is Convert Rai free?

Convert Rai costs $0.99, with no in-app purchases.

### Do Double Unit Converter or Convert Rai have ads?

Neither Double Unit Converter nor Convert Rai shows ads.

### Which is updated more often, Double Unit Converter or Convert Rai?

Double Unit Converter ships an update monthly, and Convert Rai every 4 weeks. Most recently, Double Unit Converter was updated on October 19, 2026 and Convert Rai 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.*