# M21 vs Behavior Mapping in the Hand

M21 and Behavior Mapping in the Hand 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 | M21 | Behavior Mapping in the Hand |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | — |
| Size | 115 MB | 1 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Telin](https://appshunter.io/developer/1225896354) | [Yi-An Hsieh](https://appshunter.io/developer/1847157887) |

## What reviewers say

### M21

[App page](https://appshunter.io/ios/app/m21/id1671477072)

**In-app purchases:** none


### Behavior Mapping in the Hand

[App page](https://appshunter.io/ios/app/behavior-mapping-in-the-hand/id6754218477)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is M21 free?

M21 is free to download, with no in-app purchases.

### Is Behavior Mapping in the Hand free?

Behavior Mapping in the Hand is free to download, with no in-app purchases.

### Do M21 or Behavior Mapping in the Hand have ads?

Neither M21 nor Behavior Mapping in the Hand shows 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.*