# Find Missing Addends Or Sum vs Rainfall Sandbox

Find Missing Addends Or Sum and Rainfall Sandbox 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 | Find Missing Addends Or Sum | Rainfall Sandbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Size | 34 MB | 49 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Science Education Institute](https://appshunter.io/developer/1439710468) | [Smithsonian Institution](https://appshunter.io/developer/370564865) |

## What reviewers say

### Find Missing Addends Or Sum

[App page](https://appshunter.io/ios/app/find-missing-addends-or-sum/id6702024727)

**Features:** macOS Compatibility

**In-app purchases:** none


### Rainfall Sandbox

[App page](https://appshunter.io/ios/app/rainfall-sandbox/id6736621542)

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

**In-app purchases:** none


## Frequently asked questions

### Is Find Missing Addends Or Sum free?

Find Missing Addends Or Sum is free to download, with no in-app purchases.

### Is Rainfall Sandbox free?

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

### Do Find Missing Addends Or Sum or Rainfall Sandbox have ads?

Neither Find Missing Addends Or Sum nor Rainfall Sandbox 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.*