# 공부특별시 vs Proof

The clearest difference is update cadence: Proof at every 2 days against 공부특별시's every 5 days. 공부특별시's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. 공부특별시 sells 4 in-app purchases, starting at $6.99 per month and Proof sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

공부특별시 ships an update every 5 days, Proof every 2 days. The most recent releases landed on November 5, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | 공부특별시 | Proof |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 2 days** |
| Size | 55 MB | 18 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [공부특별시](https://appshunter.io/developer/1871376760) | [hyeongsik cho](https://appshunter.io/developer/6786529134) |

## What reviewers say

### 공부특별시

[App page](https://appshunter.io/ios/app/id6759274197)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 스탠다드 월간 구독 | $6.99 | per month |
| 프리미엄 월간 구독 | $19.99 | per month |
| 스탠다드 연간 구독 | $69.99 | per year |
| 프리미엄 연간 구독 | $199.99 | per year |


### Proof

[App page](https://appshunter.io/ios/app/proof/id6786529132)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Proof Pro 월간 구독 | $2.99 | per month |
| Proof Pro 월간 구독 | $19.99 | per year |


## Frequently asked questions

### Is 공부특별시 free?

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

### Is Proof free?

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

### Do 공부특별시 or Proof have ads?

Neither 공부특별시 nor Proof shows ads.

### Which is updated more often, 공부특별시 or Proof?

공부특별시 ships an update every 5 days, and Proof every 2 days. Most recently, 공부특별시 was updated on November 5, 2026 and Proof on November 13, 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.*