# ERAI! vs ChiisanaDiary

The clearest difference is in-app purchases: ERAI! at none against ChiisanaDiary's 2. ERAI! also leads on update cadence (weekly vs fortnightly). ChiisanaDiary's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. ChiisanaDiary sells 2 in-app purchases, starting at $1.99 per month. ERAI! asks for nothing beyond the download.

ERAI! ships an update weekly, ChiisanaDiary fortnightly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ERAI! | ChiisanaDiary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Fortnightly |
| Size | 18 MB | 76 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kosuke Shimada](https://appshunter.io/developer/1529796493) | [RYOGO KAWASAKI](https://appshunter.io/developer/1642839814) |

## What reviewers say

### ERAI!

[App page](https://appshunter.io/ios/app/erai/id1529796491)

**Features:** macOS Compatibility

**In-app purchases:** none


### ChiisanaDiary

[App page](https://appshunter.io/ios/app/chiisanadiary/id6747301988)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $1.99 | per month |
| Annual Plan | $19.99 | per year |


## Frequently asked questions

### Is ERAI! free?

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

### Is ChiisanaDiary free?

ChiisanaDiary is free to download, with in-app purchases available.

### Do ERAI! or ChiisanaDiary have ads?

ERAI! shows ads; ChiisanaDiary does not.

### Which is updated more often, ERAI! or ChiisanaDiary?

ERAI! ships an update weekly, and ChiisanaDiary fortnightly. Most recently, ERAI! was updated on October 25, 2026 and ChiisanaDiary on October 24, 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.*