# Data Engineer Exam Prep vs SQL Hero

The clearest difference is ads: Data Engineer Exam Prep at none against SQL Hero's shown. Data Engineer Exam Prep also leads on update cadence (every 10 days vs every 5 weeks). SQL Hero's advantage is iOS requirement (13.0 vs 15.1). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Data Engineer Exam Prep sells 1 one-off in-app purchase and SQL Hero sells 10 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Data Engineer Exam Prep ships an update every 10 days, SQL Hero every 5 weeks. Both last shipped on October 28, 2026.

## The numbers

| Metric | Data Engineer Exam Prep | SQL Hero |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Every 5 weeks |
| Size | 106 MB | 62 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CHOI SEONGMIN](https://appshunter.io/developer/6772332527) | [ZICHENG LIU](https://appshunter.io/developer/6784299359) |

## What reviewers say

### Data Engineer Exam Prep

[App page](https://appshunter.io/ios/app/data-engineer-exam-prep/id6785744308)

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

**In-app purchases (1)**

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


### SQL Hero

[App page](https://appshunter.io/ios/app/sql-hero-ios/id6785902950)

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $7.99 | per month |
| Premium Quarterly | $19.99 | per 3 months |
| Premium Semiannual | $34.99 | per 6 months |
| Premium Yearly | $59.99 | per year |
| Starter Pack Hearts | $0.99 | one-time |
| Standard Pack Hearts | $4.99 | one-time |
| Value Pack Hearts | $12.99 | one-time |
| Mega Pack Hearts | $24.99 | one-time |
| Pro Lifetime | $89.99 | one-time |
| Premium Lifetime | $129.99 | one-time |


## Frequently asked questions

### Is Data Engineer Exam Prep free?

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

### Is SQL Hero free?

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

### Do Data Engineer Exam Prep or SQL Hero have ads?

SQL Hero shows ads; Data Engineer Exam Prep does not.

### Which is updated more often, Data Engineer Exam Prep or SQL Hero?

Data Engineer Exam Prep ships an update every 10 days, and SQL Hero every 5 weeks. Most recently, Data Engineer Exam Prep was updated on October 28, 2026 and SQL Hero on October 28, 2026.

---

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