# インフルエンザ警戒計 vs GreetngCat

The clearest difference is update cadence: GreetngCat at monthly against インフルエンザ警戒計's every 5 months. インフルエンザ警戒計's advantage is iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

インフルエンザ警戒計 ships an update every 5 months, GreetngCat monthly. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | インフルエンザ警戒計 | GreetngCat |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 64.3% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Monthly** |
| Size | 7 MB | 145 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Takahiro Izaki](https://appshunter.io/developer/511591595) | [Noboru Ishikawa](https://appshunter.io/developer/1626679013) |

## What reviewers say

### インフルエンザ警戒計

[App page](https://appshunter.io/ios/app/id567745994)

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

**In-app purchases:** none


### GreetngCat

[App page](https://appshunter.io/ios/app/greetngcat/id6449628018)

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

**In-app purchases:** none


## Frequently asked questions

### Is インフルエンザ警戒計 free?

インフルエンザ警戒計 is free to download, with no in-app purchases.

### Is GreetngCat free?

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

### Do インフルエンザ警戒計 or GreetngCat have ads?

Both インフルエンザ警戒計 and GreetngCat show ads.

### Which is updated more often, インフルエンザ警戒計 or GreetngCat?

インフルエンザ警戒計 ships an update every 5 months, and GreetngCat monthly. Most recently, インフルエンザ警戒計 was updated on November 1, 2026 and GreetngCat on November 7, 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.*