# わかる！算数 小学４年【上】 vs QB説明　２年　長さと水のかさ

The clearest difference is price: QB説明　２年　長さと水のかさ at $3.99 against わかる！算数 小学４年【上】's $9.99. QB説明　２年　長さと水のかさ also leads on iOS requirement (13.0 vs 15.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

わかる！算数 小学４年【上】 costs $9.99 and QB説明　２年　長さと水のかさ $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

わかる！算数 小学４年【上】 ships an update every 37 months, QB説明　２年　長さと水のかさ every 32 months. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | わかる！算数 小学４年【上】 | QB説明　２年　長さと水のかさ |
| --- | --- | --- |
| Price | $9.99 | **$3.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 37 months | **Every 32 months** |
| Size | 50 MB | 9 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [がくげい](https://appshunter.io/developer/415230275) | [Suzuki Educational Software Co.,Ltd.](https://appshunter.io/developer/585512975) |

## What reviewers say

### わかる！算数 小学４年【上】

[App page](https://appshunter.io/ios/app/id897322501)

**In-app purchases:** none


### QB説明　２年　長さと水のかさ

[App page](https://appshunter.io/ios/app/qb/id1470191466)

**In-app purchases:** none


## Frequently asked questions

### Is わかる！算数 小学４年【上】 free?

わかる！算数 小学４年【上】 costs $9.99, with no in-app purchases.

### Is QB説明　２年　長さと水のかさ free?

QB説明　２年　長さと水のかさ costs $3.99, with no in-app purchases.

### Do わかる！算数 小学４年【上】 or QB説明　２年　長さと水のかさ have ads?

Neither わかる！算数 小学４年【上】 nor QB説明　２年　長さと水のかさ shows ads.

### Which is updated more often, わかる！算数 小学４年【上】 or QB説明　２年　長さと水のかさ?

わかる！算数 小学４年【上】 ships an update every 37 months, and QB説明　２年　長さと水のかさ every 32 months. Most recently, わかる！算数 小学４年【上】 was updated on October 15, 2026 and QB説明　２年　長さと水のかさ on October 10, 2026.

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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.*