# PDD Study vs Sofia AI

The clearest difference is in-app purchases: Sofia AI at none against PDD Study's 2. PDD Study's advantage is iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. PDD Study sells 2 in-app purchases, starting at $5.99 per month. Sofia AI asks for nothing beyond the download.

## The numbers

| Metric | PDD Study | Sofia AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Size | 66 MB | 36 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Almaz Alekeev](https://appshunter.io/developer/1844773385) | [bookshop.kz](https://appshunter.io/developer/1778613642) |

## What reviewers say

### PDD Study

[App page](https://appshunter.io/ios/app/pdd-study/id6753738135)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ПДД Pro | $5.99 | per month |
| ПДД Про | $9.99 | per 3 months |


### Sofia AI

[App page](https://appshunter.io/ios/app/sofia-ai/id6772715258)

**In-app purchases:** none


## Frequently asked questions

### Is PDD Study free?

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

### Is Sofia AI free?

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

### Do PDD Study or Sofia AI have ads?

Neither PDD Study nor Sofia AI shows ads.

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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.*