# DoSan vs Thinkbig TOPIK

The clearest difference is in-app purchases: DoSan at none against Thinkbig TOPIK's 5. Thinkbig TOPIK's advantage is update cadence (every 2 weeks vs every 7 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Thinkbig TOPIK sells 5 in-app purchases, starting at $9.99 per month. DoSan asks for nothing beyond the download.

DoSan ships an update every 7 months, Thinkbig TOPIK every 2 weeks. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | DoSan | Thinkbig TOPIK |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 87.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 50 MB | 30 MB |
| Requires iOS | 13.0 | **12.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Tran Cong Nghia](https://appshunter.io/developer/1540219036) | [Woongjin Thinkbig Co., Ltd.](https://appshunter.io/developer/1614968450) |

## What reviewers say

### DoSan

[App page](https://appshunter.io/ios/app/dosan/id1551374256)

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

**In-app purchases:** none


### Thinkbig TOPIK

[App page](https://appshunter.io/ios/app/thinkbig-topik/id6736814780)

Enhance your TOPIK score with AI-powered, customized learning. This app offers structured courses, practice questions, and mock tests tailored to your skill level. Track your progress and review difficult concepts to prepare effectively for the exam.

**Highlights:** AI-based customized learning curriculum, 12 courses for TOPIK levels 1-6, Practice questions and mock tests, Vocabulary and grammar review, Writing exercises with feedback, Progress tracking and real-time evaluation, Multi-language support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1-Month Plan Trial | $9.99 | per month |
| 1-Month Plan | $9.99 | per month |
| 3-Month Plan | $44.99 | one-time |
| 6-Month Plan | $77.99 | one-time |
| 12-Month Plan | $118.99 | one-time |


## Frequently asked questions

### Is DoSan free?

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

### Is Thinkbig TOPIK free?

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

### Do DoSan or Thinkbig TOPIK have ads?

Neither DoSan nor Thinkbig TOPIK shows ads.

### Which is updated more often, DoSan or Thinkbig TOPIK?

DoSan ships an update every 7 months, and Thinkbig TOPIK every 2 weeks. Most recently, DoSan was updated on October 25, 2026 and Thinkbig TOPIK on October 30, 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.*