# KAERU vs ShareDiary（シェアダイアリー）

The clearest difference is ads: ShareDiary（シェアダイアリー） at none against KAERU's shown. KAERU's advantage is update cadence (monthly vs every 2 months) and iOS requirement (12.0 vs 15.6). On price, 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.

KAERU ships an update monthly, ShareDiary（シェアダイアリー） every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | KAERU | ShareDiary（シェアダイアリー） |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 18 MB | 32 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Densuke Inc.](https://appshunter.io/developer/985950764) | [Shuntaro Shimada](https://appshunter.io/developer/1616517321) |

## What reviewers say

### KAERU

[App page](https://appshunter.io/ios/app/kaeru/id1068741053)

A private and secure chat app designed for two people. It allows for quick messaging with a single tap, eliminating the need for registration or authentication. Easily send important messages to your dearest person.

**Highlights:** Private and secure chat, One-tap message sending, No registration required, No SNS authentication, Designed for two people

**Features:** macOS Compatibility

**In-app purchases:** none


### ShareDiary（シェアダイアリー）

[App page](https://appshunter.io/ios/app/sharediary/id1616517319)

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

**In-app purchases:** none


## Frequently asked questions

### Is KAERU free?

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

### Is ShareDiary（シェアダイアリー） free?

ShareDiary（シェアダイアリー） is free to download, with no in-app purchases.

### Do KAERU or ShareDiary（シェアダイアリー） have ads?

KAERU shows ads; ShareDiary（シェアダイアリー） does not.

### Which is updated more often, KAERU or ShareDiary（シェアダイアリー）?

KAERU ships an update monthly, and ShareDiary（シェアダイアリー） every 2 months. Most recently, KAERU was updated on November 2, 2026 and ShareDiary（シェアダイアリー） on November 3, 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.*