# Big Data Knowledge Test vs D426 Mastery

Big Data Knowledge Test and D426 Mastery are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Big Data Knowledge Test sells 2 in-app purchases, starting at $13.99 per month and D426 Mastery sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Big Data Knowledge Test | D426 Mastery |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Size | 9 MB | 4 MB |
| Requires iOS | **17.2** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) | [JOHN TIMOTHY DISALLE](https://appshunter.io/developer/1886538582) |

## 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 |


### D426 Mastery

[App page](https://appshunter.io/ios/app/d426-mastery/id6761743682)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $7.99 | per month |
| Lifetime Access | $24.99 | 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 D426 Mastery free?

D426 Mastery is free to download, with in-app purchases available.

### Do Big Data Knowledge Test or D426 Mastery have ads?

Neither Big Data Knowledge Test nor D426 Mastery 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.*