# Data Engineer Pro Prep vs Database Query Logic

The clearest difference is in-app purchases: Database Query Logic at none against Data Engineer Pro Prep's 1. Data Engineer Pro Prep'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. Data Engineer Pro Prep sells 1 one-off in-app purchase. Database Query Logic asks for nothing beyond the download.

## The numbers

| Metric | Data Engineer Pro Prep | Database Query Logic |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Size | 86 MB | 38 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AITYTECH](https://appshunter.io/developer/1885549185) | [AFTW LLC](https://appshunter.io/developer/1886356149) |

## What reviewers say

### Data Engineer Pro Prep

[App page](https://appshunter.io/ios/app/data-engineer-pro-prep/id6762125643)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Lifetime | $3.99 | one-time |


### Database Query Logic

[App page](https://appshunter.io/ios/app/database-query-logic/id6774180202)

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

**In-app purchases:** none


## Frequently asked questions

### Is Data Engineer Pro Prep free?

Data Engineer Pro Prep is free to download, with in-app purchases available.

### Is Database Query Logic free?

Database Query Logic is free to download, with no in-app purchases.

### Do Data Engineer Pro Prep or Database Query Logic have ads?

Neither Data Engineer Pro Prep nor Database Query Logic 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.*