# Query Optimization Concepts vs DP

The clearest difference is in-app purchases: Query Optimization Concepts at none against DP's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. DP sells 1 one-off in-app purchase. Query Optimization Concepts asks for nothing beyond the download.

## The numbers

| Metric | Query Optimization Concepts | DP |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 5 days |
| Size | 38 MB | 164 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AFTW LLC](https://appshunter.io/developer/1886356149) | [CHOI SEONGMIN](https://appshunter.io/developer/6772332527) |

## What reviewers say

### Query Optimization Concepts

[App page](https://appshunter.io/ios/app/query-optimization-concepts/id6773823412)

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

**In-app purchases:** none


### DP

[App page](https://appshunter.io/ios/app/dp-300-sql-solutions-exam-prep/id6782107643)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DP-300 Lifetime Access | $4.99 | one-time |


## Frequently asked questions

### Is Query Optimization Concepts free?

Query Optimization Concepts is free to download, with no in-app purchases.

### Is DP free?

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

### Do Query Optimization Concepts or DP have ads?

Neither Query Optimization Concepts nor DP 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.*