# Data Engineer Cert Prep vs Math Vale

The clearest difference is in-app purchases: Data Engineer Cert Prep at none against Math Vale's 2. Math Vale's advantage is update cadence (every 4 days vs every 13 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Math Vale sells 2 in-app purchases, starting at $39.99 per year. Data Engineer Cert Prep asks for nothing beyond the download.

Data Engineer Cert Prep ships an update every 13 months, Math Vale every 4 days. The most recent releases landed on October 18, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Data Engineer Cert Prep | Math Vale |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 4 days** |
| Size | 1 MB | 9 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DjamgaTech Corp](https://appshunter.io/developer/969000181) | [Yinhuan Yuan](https://appshunter.io/developer/6811600067) |

## What reviewers say

### Data Engineer Cert Prep

[App page](https://appshunter.io/ios/app/data-engineer-cert-prep/id6566170013)

**Features:** Vision Pro support

**In-app purchases:** none


### Math Vale

[App page](https://appshunter.io/ios/app/math-vale/id6812591516)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Math Vale, a year | $39.99 | per year |
| Math Vale, for good | $79.99 | one-time |


## Frequently asked questions

### Is Data Engineer Cert Prep free?

Data Engineer Cert Prep is free to download, with no in-app purchases.

### Is Math Vale free?

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

### Do Data Engineer Cert Prep or Math Vale have ads?

Neither Data Engineer Cert Prep nor Math Vale shows ads.

### Which is updated more often, Data Engineer Cert Prep or Math Vale?

Data Engineer Cert Prep ships an update every 13 months, and Math Vale every 4 days. Most recently, Data Engineer Cert Prep was updated on October 18, 2026 and Math Vale on October 5, 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.*