# LD vs QB説明　２年　長さと水のかさ

The clearest difference is price: LD at Free against QB説明　２年　長さと水のかさ's $3.99. LD also leads on update cadence (every 4 months vs every 32 months). QB説明　２年　長さと水のかさ's advantage is iOS requirement (13.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

LD is free to download; QB説明　２年　長さと水のかさ costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LD ships an update every 4 months, QB説明　２年　長さと水のかさ every 32 months. The most recent releases landed on October 18, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | LD | QB説明　２年　長さと水のかさ |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 32 months |
| Size | 172 MB | 9 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [一般社団法人 日本LD学会](https://appshunter.io/developer/1373157749) | [Suzuki Educational Software Co.,Ltd.](https://appshunter.io/developer/585512975) |

## What reviewers say

### LD

[App page](https://appshunter.io/ios/app/ld-skaip/id1375375145)

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

**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 LD free?

LD is free to download, 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 LD or QB説明　２年　長さと水のかさ have ads?

Neither LD nor QB説明　２年　長さと水のかさ shows ads.

### Which is updated more often, LD or QB説明　２年　長さと水のかさ?

LD ships an update every 4 months, and QB説明　２年　長さと水のかさ every 32 months. Most recently, LD was updated on October 18, 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.*