# Koreez vs Improvis OC

The clearest difference is in-app purchases: Improvis OC at none against Koreez's 13. Improvis OC also leads on iOS requirement (12.0 vs 16.6). Koreez's advantage is update cadence (every 2 weeks vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Koreez sells 13 in-app purchases, starting at $1.90 per 7 days. Improvis OC asks for nothing beyond the download.

Koreez ships an update every 2 weeks, Improvis OC monthly. The most recent releases landed on October 6, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Koreez | Improvis OC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (40 ratings)](https://appshunter.io/ios/app/koreez/id6465207992/reviews)** | — |
| Number of ratings | **40** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Freemium | — |
| Size | 58 MB | 79 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [KoreezKoreez Educational Program CJS](https://appshunter.io/developer/1706487729) | [Improvis LLC](https://appshunter.io/developer/1466792939) |

## What reviewers say

### Koreez

[App page](https://appshunter.io/ios/app/koreez/id6465207992)

Engage in a competitive quiz game that blends school curriculum with general knowledge. Challenge friends, earn points, and climb leaderboards to become a quiz champion. Suitable for students and knowledge seekers of all ages.

**Highlights:** Curriculum-based quizzes, General knowledge questions, Competitive gameplay, Leaderboard rankings, Friend challenges, Brainpower boosting

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

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $1.90 | per 7 days |
| Monthly Subscription | $3.99 | per month |
| Monthly Subscription | $4.95 | per month |
| Monthly Subscription | $5.99 | per month |
| Yearly Subscription | $19.99 | per year |
| Yearly Subscription | $37.49 | per year |
| Yearly Subscription | $40.90 | per year |
| 30 keys | $0.49 | one-time |
| 70 keys | $0.99 | one-time |
| 150 keys | $1.99 | one-time |
| 320 keys | $3.99 | one-time |
| Event Ticket | $5.99 | one-time |
| Combo | $6.99 | one-time |


### Improvis OC

[App page](https://appshunter.io/ios/app/improvis-oc/id6742733583)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Koreez free?

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

### Is Improvis OC free?

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

### Do Koreez or Improvis OC have ads?

Neither Koreez nor Improvis OC shows ads.

### Which is updated more often, Koreez or Improvis OC?

Koreez ships an update every 2 weeks, and Improvis OC monthly. Most recently, Koreez was updated on October 6, 2026 and Improvis OC on September 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.*