# Vocab Book vs StudyDuo

The clearest difference is in-app purchases: Vocab Book at none against StudyDuo's 4. StudyDuo's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. StudyDuo sells 4 in-app purchases, starting at $4.99 per month. Vocab Book asks for nothing beyond the download.

## The numbers

| Metric | Vocab Book | StudyDuo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Every 2 weeks |
| Size | 1 MB | 90 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | — | **iPhone, iPad** |
| Age rating | 17+ | 4+ |
| Developer | [Oliver Brehm](https://appshunter.io/developer/837610350) | [Oleh Shapoval](https://appshunter.io/developer/1885768695) |

## What reviewers say

### Vocab Book

[App page](https://appshunter.io/ios/app/vocab-book/id837610347)

**In-app purchases:** none


### StudyDuo

[App page](https://appshunter.io/ios/app/studyduo-study-with-me/id6760692541)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $49.99 | per year |
| Superboost | $0.99 | one-time |
| 10 Superboosts | $4.99 | one-time |


## Frequently asked questions

### Is Vocab Book free?

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

### Is StudyDuo free?

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

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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.*