# Big Data Knowledge Test vs PhlashCards Security Test Prep

Big Data Knowledge Test and PhlashCards Security Test Prep are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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 PhlashCards Security Test Prep sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 27, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Big Data Knowledge Test | PhlashCards Security Test Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Size | 9 MB | 64 MB |
| Requires iOS | **17.2** | 18.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) | [Hodge Podgin LLC](https://appshunter.io/developer/1873814194) |

## 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 |


### PhlashCards Security Test Prep

[App page](https://appshunter.io/ios/app/phlashcards-security-test-prep/id6759810555)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Security+ Premium | $14.99 | one-time |
| Pentest+ Premium | $14.99 | one-time |
| SecAI+ Premium | $19.99 | one-time |
| CISSP Premium | $19.99 | 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 PhlashCards Security Test Prep free?

PhlashCards Security Test Prep is free to download, with in-app purchases available.

### Do Big Data Knowledge Test or PhlashCards Security Test Prep have ads?

Neither Big Data Knowledge Test nor PhlashCards Security Test Prep shows ads.

### Which is updated more often, Big Data Knowledge Test or PhlashCards Security Test Prep?

Big Data Knowledge Test ships an update every 3 months, and PhlashCards Security Test Prep every 3 months. Most recently, Big Data Knowledge Test was updated on September 27, 2026 and PhlashCards Security Test Prep on September 21, 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.*