# TheLostKOSM vs 브레인메이트

The clearest difference is in-app purchases: TheLostKOSM at none against 브레인메이트's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 브레인메이트 sells 2 in-app purchases, starting at $9.99 per month. TheLostKOSM asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | TheLostKOSM | 브레인메이트 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/10/id6553989954/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 77.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | — | Free |
| Size | 172 MB | 98 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Korea National Ocean Science Museum](https://appshunter.io/developer/1625817672) | [서사](https://appshunter.io/developer/1563870025) |

## What reviewers say

### TheLostKOSM

[App page](https://appshunter.io/ios/app/thelostkosm/id1626500208)

**Features:** macOS Compatibility

**In-app purchases:** none


### 브레인메이트

[App page](https://appshunter.io/ios/app/10/id6553989954)

This app offers a 10-minute daily learning routine for students, focusing on memory retention through short, concept-based readings and quizzes. It covers subjects like social studies, science, and current events, designed to build strong foundational knowledge and improve literacy and critical thinking skills.

**Highlights:** 10-minute daily learning sessions, Brain science-based learning design, Concept-based readings and quizzes, Covers social studies, science, current events, Improves literacy and critical thinking, Suitable for all grades (elementary to high school)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 브레인메이트 멤버십 정기구독 | $9.99 | per month |
| 브레인메이트 멤버십 | $69.99 | per year |


## Frequently asked questions

### Is TheLostKOSM free?

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

### Is 브레인메이트 free?

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

### Do TheLostKOSM or 브레인메이트 have ads?

Neither TheLostKOSM nor 브레인메이트 shows ads.

### Which is updated more often, TheLostKOSM or 브레인메이트?

TheLostKOSM ships an update weekly, and 브레인메이트 weekly. Most recently, TheLostKOSM was updated on October 7, 2026 and 브레인메이트 on October 15, 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.*