# SQLDOU vs Query Optimization Concepts

The clearest difference is in-app purchases: Query Optimization Concepts at none against SQLDOU's 1. Query Optimization Concepts also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

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

## The numbers

| Metric | SQLDOU | Query Optimization Concepts |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | — |
| Size | 12 MB | 38 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Fuji Bit Inc.](https://appshunter.io/developer/1874205957) | [Tsuyoshi Sezaki](https://appshunter.io/developer/1886356149) |

## What reviewers say

### SQLDOU

[App page](https://appshunter.io/ios/app/sqldou/id6760616192)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SQLDOU Pro | $5.99 | one-time |


### Query Optimization Concepts

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

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

**In-app purchases:** none


## Frequently asked questions

### Is SQLDOU free?

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

### Is Query Optimization Concepts free?

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

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

SQLDOU shows ads; Query Optimization Concepts does not.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*