# must be one vs Teach the Thief

The clearest difference is in-app purchases: must be one at none against Teach the Thief's 7. must be one also leads on iOS requirement (15.6 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Teach the Thief sells 7 one-off in-app purchases. must be one asks for nothing beyond the download.

## The numbers

| Metric | must be one | Teach the Thief |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 weeks | — |
| Size | 6 MB | 38 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [office-canard games](https://appshunter.io/developer/6793797221) | [Vinicios Cunha](https://appshunter.io/developer/1824017803) |

## What reviewers say

### must be one

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

**In-app purchases:** none


### Teach the Thief

[App page](https://appshunter.io/ios/app/teach-the-thief/id6809291621)

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| King Pip | $0.99 | one-time |
| Wizard Pip | $0.99 | one-time |
| Pirate Pip | $0.99 | one-time |
| Astronaut Pip | $0.99 | one-time |
| Detective Pip | $0.99 | one-time |
| Chef Pip | $0.99 | one-time |
| No Ads | $4.99 | one-time |


## Frequently asked questions

### Is must be one free?

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

### Is Teach the Thief free?

Teach the Thief is free to download, with in-app purchases available.

### Do must be one or Teach the Thief have ads?

Both must be one and Teach the Thief 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.*