# ERAI! vs Oshi Time

The clearest difference is in-app purchases: ERAI! at none against Oshi Time's 5. ERAI! also leads on device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Oshi Time sells 5 in-app purchases, starting at $2.49 per month. ERAI! asks for nothing beyond the download.

ERAI! ships an update weekly, Oshi Time every 5 days. Both last shipped on September 8, 2026.

## The numbers

| Metric | ERAI! | Oshi Time |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 54.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 18 MB | 147 MB |
| Requires iOS | **15.0** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kosuke Shimada](https://appshunter.io/developer/1529796493) | [keita suzuki](https://appshunter.io/developer/1620148819) |

## What reviewers say

### ERAI!

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Oshi Time

[App page](https://appshunter.io/ios/app/oshi-time-study-and-focus-timer/id6449951882)

Enhance your study sessions with a personalized focus timer featuring your favorite idols, characters, or actors. Earn motivational messages and track your progress with customizable themes and layouts. Turn your passion into productivity and build discipline.

**Highlights:** Customizable themes with favorite characters, Motivational reward messages, Automatic study hour tracking, Pomodoro, countdown, and stopwatch modes, Ticket Mode for event syncing, Immersive focus with UI hiding

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $2.49 | per month |
| Premium Plan | $2.99 | per month |
| Premium Plan | $17.99 | per year |
| Premium Plan | $24.99 | per year |
| Premium Plan | $79.99 | one-time |


## Frequently asked questions

### Is ERAI! free?

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

### Is Oshi Time free?

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

### Do ERAI! or Oshi Time have ads?

Both ERAI! and Oshi Time show ads.

### Which is updated more often, ERAI! or Oshi Time?

ERAI! ships an update weekly, and Oshi Time every 5 days. Most recently, ERAI! was updated on September 8, 2026 and Oshi Time on September 8, 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.*