# Big Data Knowledge Test vs SQLDOU

The clearest difference is ads: Big Data Knowledge Test at none against SQLDOU's shown. SQLDOU's advantage is update cadence (every 3 weeks vs every 3 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Big Data Knowledge Test sells 2 in-app purchases, starting at $13.99 per month and SQLDOU sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Big Data Knowledge Test ships an update every 3 months, SQLDOU every 3 weeks. The most recent releases landed on September 27, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Big Data Knowledge Test | SQLDOU |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 9 MB | 10 MB |
| Requires iOS | 17.2 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) | [Fuji Bit Inc.](https://appshunter.io/developer/1874205957) |

## What reviewers say

### Big Data Knowledge Test

[App page](https://appshunter.io/ios/app/big-data-knowledge-test/id6740737722)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium monthly subscription | $13.99 | per month |
| Lifetime version | $24.99 | one-time |


### 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 |


## Frequently asked questions

### Is Big Data Knowledge Test free?

Big Data Knowledge Test is free to download, with in-app purchases available.

### Is SQLDOU free?

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

### Do Big Data Knowledge Test or SQLDOU have ads?

SQLDOU shows ads; Big Data Knowledge Test does not.

### Which is updated more often, Big Data Knowledge Test or SQLDOU?

Big Data Knowledge Test ships an update every 3 months, and SQLDOU every 3 weeks. Most recently, Big Data Knowledge Test was updated on September 27, 2026 and SQLDOU on September 18, 2026.

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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.*