# 21 Grams Box vs Flexapil Flow

The clearest difference is device support: Flexapil Flow at 3 against 21 Grams Box's —. Flexapil Flow also leads on iOS requirement (12.0 vs 15.0). On price and in-app purchases there is nothing between them.

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

## The numbers

| Metric | 21 Grams Box | Flexapil Flow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | — | Every 2 months |
| Size | 3 MB | 99 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Bookup OE](https://appshunter.io/developer/1694379551) | [Spyridon Kaftanis](https://appshunter.io/developer/1585690543) |

## What reviewers say

### 21 Grams Box

[App page](https://appshunter.io/ios/app/21-grams-box/id6630384542)

**In-app purchases:** none


### Flexapil Flow

[App page](https://appshunter.io/ios/app/flexapil-flow/id6747510990)

**In-app purchases:** none


## Frequently asked questions

### Is 21 Grams Box free?

21 Grams Box is free to download, with no in-app purchases.

### Is Flexapil Flow free?

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

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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.*