# must be one vs Rainrelay

must be one and Rainrelay are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | must be one | Rainrelay |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 5 weeks | — |
| Size | 6 MB | 224 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [office-canard games](https://appshunter.io/developer/6793797221) | [DINH TAN HOANG](https://appshunter.io/developer/1881831979) |

## What reviewers say

### must be one

[App page](https://appshunter.io/ios/app/must-be-one/id6794124997)

**In-app purchases:** none


### Rainrelay

[App page](https://appshunter.io/ios/app/rainrelay/id6811487977)

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

**In-app purchases:** none


## Frequently asked questions

### Is must be one free?

must be one is free to download, with no in-app purchases.

### Is Rainrelay free?

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

### Do must be one or Rainrelay have ads?

Both must be one and Rainrelay show ads.

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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.*