# 30 Seconds vs Big Data Knowledge Test

The clearest difference is in-app purchases: 30 Seconds at none against Big Data Knowledge Test's 2. 30 Seconds also leads on device support (3 vs 1) and iOS requirement (9.0 vs 17.2). Big Data Knowledge Test's advantage is update cadence (every 3 months vs every 9 months). On price and ads 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. 30 Seconds asks for nothing beyond the download.

30 Seconds ships an update every 9 months, Big Data Knowledge Test every 3 months. The most recent releases landed on October 6, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | 30 Seconds | Big Data Knowledge Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/30-seconds-fast-math/id980479414/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 14 MB | 9 MB |
| Requires iOS | **9.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Pouria Almassi](https://appshunter.io/developer/980479413) | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) |

## What reviewers say

### 30 Seconds

[App page](https://appshunter.io/ios/app/30-seconds-fast-math/id980479414)

Test your mental math abilities by solving as many equations as possible within a 30-second time limit. This app focuses on addition, subtraction, and multiplication, with plans to add more operations. Track your progress and aim for new high scores.

**Highlights:** Solve math equations quickly, Improve mental math skills, Includes addition, subtraction, multiplication, Track high scores, 30-second timed challenges

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is 30 Seconds free?

30 Seconds is free to download, with no in-app purchases.

### Is Big Data Knowledge Test free?

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

### Do 30 Seconds or Big Data Knowledge Test have ads?

Neither 30 Seconds nor Big Data Knowledge Test shows ads.

### Which is updated more often, 30 Seconds or Big Data Knowledge Test?

30 Seconds ships an update every 9 months, and Big Data Knowledge Test every 3 months. Most recently, 30 Seconds was updated on October 6, 2026 and Big Data Knowledge Test on September 27, 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.*