# 오답노트AI vs mellow

The clearest difference is in-app purchases: 오답노트AI at none against mellow's 2. 오답노트AI also leads on update cadence (every 2 days vs weekly). mellow's advantage is iOS requirement (16.4 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. mellow sells 2 in-app purchases, starting at $7.99 per month. 오답노트AI asks for nothing beyond the download.

오답노트AI ships an update every 2 days, mellow weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | 오답노트AI | mellow |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Weekly |
| Monetization | Freemium | — |
| Size | 33 MB | 129 MB |
| Requires iOS | 18.0 | **16.4** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [2Labs](https://appshunter.io/developer/1089573745) | [Nullge](https://appshunter.io/developer/1710419601) |

## What reviewers say

### 오답노트AI

[App page](https://appshunter.io/ios/app/ai-ai/id6787683753)

This app uses AI to automatically create personalized study notes and practice tests from your incorrect answers. Simply photograph your mistakes, and the AI will transcribe them, organize them by subject, and generate similar problems for further practice. It also offers an AI tutor for instant help and tracks your progress with weekly reports.

**Highlights:** AI-generated study notes from photos, Automatic organization by subject and unit, Personalized practice tests with similar problems, AI tutor for instant help with questions, Spaced repetition for review, Weekly progress reports, Printable PDF test creation

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

**In-app purchases:** none


### mellow

[App page](https://appshunter.io/ios/app/mellow-ai-language-practice/id6809682341)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| mellow Membership Monthly | $7.99 | per month |
| mellow Membership Yearly | $59.99 | per year |


## Frequently asked questions

### Is 오답노트AI free?

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

### Is mellow free?

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

### Do 오답노트AI or mellow have ads?

Neither 오답노트AI nor mellow shows ads.

### Which is updated more often, 오답노트AI or mellow?

오답노트AI ships an update every 2 days, and mellow weekly. Most recently, 오답노트AI was updated on October 24, 2026 and mellow 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.*