# ERAI! vs Negaiboshi

The clearest difference is in-app purchases: ERAI! at none against Negaiboshi's 3. Negaiboshi's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Negaiboshi sells 3 in-app purchases, starting at $2.99 per month. ERAI! asks for nothing beyond the download.

ERAI! ships an update weekly, Negaiboshi every 2 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | ERAI! | Negaiboshi |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 2 weeks |
| Size | 18 MB | 36 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kosuke Shimada](https://appshunter.io/developer/1529796493) | [Kouki Toyoda](https://appshunter.io/developer/6785835166) |

## What reviewers say

### ERAI!

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Negaiboshi

[App page](https://appshunter.io/ios/app/negaiboshi/id6794682125)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Negaiboshi Pro | $2.99 | per month |
| History of Everyone's Sky | $3.99 | one-time |
| Choose Where Your Star Shines | $3.99 | one-time |


## Frequently asked questions

### Is ERAI! free?

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

### Is Negaiboshi free?

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

### Do ERAI! or Negaiboshi have ads?

ERAI! shows ads; Negaiboshi does not.

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

ERAI! ships an update weekly, and Negaiboshi every 2 weeks. Most recently, ERAI! was updated on October 25, 2026 and Negaiboshi on October 25, 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.*