# N1 文法問題集 vs RainbowSky

The clearest difference is price: RainbowSky at Free against N1 文法問題集's $9.99. RainbowSky also leads on update cadence (every 2 weeks vs every 4 months) and iOS requirement (12.0 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

RainbowSky is free to download; N1 文法問題集 costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

N1 文法問題集 ships an update every 4 months, RainbowSky every 2 weeks. The most recent releases landed on October 26, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | N1 文法問題集 | RainbowSky |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Size | 16 MB | 292 MB |
| Requires iOS | 26.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yamase & Touwa Japanese Insititute](https://appshunter.io/developer/442115304) | [Open Knowledge Association Ltd.](https://appshunter.io/developer/868011308) |

## What reviewers say

### N1 文法問題集

[App page](https://appshunter.io/ios/app/n1/id532865948)

**Features:** Vision Pro support

**In-app purchases:** none


### RainbowSky

[App page](https://appshunter.io/ios/app/rainbowsky/id6771268020)

**In-app purchases:** none


## Frequently asked questions

### Is N1 文法問題集 free?

N1 文法問題集 costs $9.99, with no in-app purchases.

### Is RainbowSky free?

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

### Do N1 文法問題集 or RainbowSky have ads?

Neither N1 文法問題集 nor RainbowSky shows ads.

### Which is updated more often, N1 文法問題集 or RainbowSky?

N1 文法問題集 ships an update every 4 months, and RainbowSky every 2 weeks. Most recently, N1 文法問題集 was updated on October 26, 2026 and RainbowSky on October 6, 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.*