# otu.ai vs 렘(remm)

The clearest difference is update cadence: 렘(remm) at every 4 days against otu.ai's fortnightly. otu.ai's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. otu.ai sells 2 in-app purchases, starting at $4.99 per month and 렘(remm) sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

otu.ai ships an update fortnightly, 렘(remm) every 4 days. The most recent releases landed on November 8, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | otu.ai | 렘(remm) |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Size | 27 MB | 17 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [opentutorials](https://appshunter.io/developer/1719897055) | [Seonggu Kim](https://appshunter.io/developer/1764910013) |

## What reviewers say

### otu.ai

[App page](https://appshunter.io/ios/app/otuai/id6473810282)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $4.99 | per month |
| Yearly Subscription | $44.99 | per year |


### 렘(remm)

[App page](https://appshunter.io/ios/app/remm-ai/id6779516559)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 프로 월간 | $9.99 | per month |
| 프로 연간 | $99.99 | per year |


## Frequently asked questions

### Is otu.ai free?

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

### Is 렘(remm) free?

렘(remm) is free to download, with in-app purchases available.

### Do otu.ai or 렘(remm) have ads?

Neither otu.ai nor 렘(remm) shows ads.

### Which is updated more often, otu.ai or 렘(remm)?

otu.ai ships an update fortnightly, and 렘(remm) every 4 days. Most recently, otu.ai was updated on November 8, 2026 and 렘(remm) 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.*