# Japi vs Big Data Knowledge Test

The clearest difference is update cadence: Japi at every 3 weeks against Big Data Knowledge Test's every 3 months. Japi also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.2). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Japi sells 4 in-app purchases, starting at $1.99 per month and Big Data Knowledge Test sells 2 in-app purchases, starting at $13.99 per month. Whichever you choose, the download price is not the number that matters.

Japi ships an update every 3 weeks, Big Data Knowledge Test every 3 months. The most recent releases landed on August 25, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Japi | Big Data Knowledge Test |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 101 MB | 9 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Japi Edu Tech](https://appshunter.io/developer/1765128021) | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) |

## What reviewers say

### Japi

[App page](https://appshunter.io/ios/app/japi/id6670504412)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Japi Pro - Monthly (Disc. 75%) | $1.99 | per month |
| Japi Pro - Monthly (Disc. 50%) | $8.99 | per month |
| Japi Pro - Monthly | $8.99 | per month |
| Japi Pro - Yearly | $39.99 | per year |


### 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 Japi free?

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

### Is Big Data Knowledge Test free?

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

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

Neither Japi nor Big Data Knowledge Test shows ads.

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

Japi ships an update every 3 weeks, and Big Data Knowledge Test every 3 months. Most recently, Japi was updated on August 25, 2026 and Big Data Knowledge Test on September 27, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*