# sirene vs 【flat】公式アプリ

sirene and 【flat】公式アプリ are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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.

sirene ships an update every 38 months, 【flat】公式アプリ every 33 months. The most recent releases landed on October 4, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | sirene | 【flat】公式アプリ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 33 months** |
| Size | 18 MB | 32 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KANAKO TSUKADA](https://appshunter.io/developer/1460790842) | [KAORI FUKUSHIMA](https://appshunter.io/developer/1583931219) |

## What reviewers say

### sirene

[App page](https://appshunter.io/ios/app/sirene/id1460790843)

**In-app purchases:** none


### 【flat】公式アプリ

[App page](https://appshunter.io/ios/app/flat/id1583931217)

**In-app purchases:** none


## Frequently asked questions

### Is sirene free?

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

### Is 【flat】公式アプリ free?

【flat】公式アプリ is free to download, with no in-app purchases.

### Do sirene or 【flat】公式アプリ have ads?

Neither sirene nor 【flat】公式アプリ shows ads.

### Which is updated more often, sirene or 【flat】公式アプリ?

sirene ships an update every 38 months, and 【flat】公式アプリ every 33 months. Most recently, sirene was updated on October 4, 2026 and 【flat】公式アプリ 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.*