# Koza vs StudyDuo

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

Both are free to download. StudyDuo sells 2 in-app purchases, starting at $4.99 per month. Koza asks for nothing beyond the download.

Koza ships an update every 8 days, StudyDuo every 9 days. The most recent releases landed on October 2, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Koza | StudyDuo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 9 days |
| Size | 80 MB | 73 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [KOZA LLC](https://appshunter.io/developer/1845715206) | [Oleh Shapoval](https://appshunter.io/developer/1885768695) |

## What reviewers say

### Koza

[App page](https://appshunter.io/ios/app/koza-find-your-study-buddy/id6754465784)

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

**In-app purchases:** none


### StudyDuo

[App page](https://appshunter.io/ios/app/studyduo-focus-timer/id6760692541)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $49.99 | per year |


## Frequently asked questions

### Is Koza free?

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

### Is StudyDuo free?

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

### Do Koza or StudyDuo have ads?

Neither Koza nor StudyDuo shows ads.

### Which is updated more often, Koza or StudyDuo?

Koza ships an update every 8 days, and StudyDuo every 9 days. Most recently, Koza was updated on October 2, 2026 and StudyDuo on October 12, 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.*