# Big Data Knowledge Test vs CDPSE Data Privacy Test Prep

The clearest difference is update cadence: Big Data Knowledge Test at every 3 months against CDPSE Data Privacy Test Prep's every 19 months. CDPSE Data Privacy Test Prep's advantage is iOS requirement (15.1 vs 17.2). On price, ads, in-app purchases and device support 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 CDPSE Data Privacy Test Prep sells 9 in-app purchases, starting at $8.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Big Data Knowledge Test ships an update every 3 months, CDPSE Data Privacy Test Prep every 19 months. The most recent releases landed on September 27, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Big Data Knowledge Test | CDPSE Data Privacy Test Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 19 months |
| Size | 9 MB | 62 MB |
| Requires iOS | 17.2 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) | [YAUHEN BAHDANOVICH](https://appshunter.io/developer/1711932790) |

## 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 |


### CDPSE Data Privacy Test Prep

[App page](https://appshunter.io/ios/app/cdpse-data-privacy-test-prep/id6742385668)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CDPSE Weekly Full Access | $8.99 | per 7 days |
| CDPSE Monthly Full Access | $24.99 | per month |
| CDPSE Monthly Full Access | $34.99 | per month |
| CDPSE Quarterly Full Access | $55.99 | per 3 months |
| CDPSE Quarterly Full Access | $59.99 | per 3 months |
| CDPSE Semiannual Full Access | $75.99 | per 6 months |
| CDPSE Semiannual Full Access | $79.99 | per 6 months |
| CDPSE Annual Full Access | $109.99 | per year |
| CDPSE Annual Full Access | $119.99 | per year |


## Frequently asked questions

### Is Big Data Knowledge Test free?

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

### Is CDPSE Data Privacy Test Prep free?

CDPSE Data Privacy Test Prep is free to download, with in-app purchases available.

### Do Big Data Knowledge Test or CDPSE Data Privacy Test Prep have ads?

Neither Big Data Knowledge Test nor CDPSE Data Privacy Test Prep shows ads.

### Which is updated more often, Big Data Knowledge Test or CDPSE Data Privacy Test Prep?

Big Data Knowledge Test ships an update every 3 months, and CDPSE Data Privacy Test Prep every 19 months. Most recently, Big Data Knowledge Test was updated on September 27, 2026 and CDPSE Data Privacy Test Prep on October 2, 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.*