# Groundwater App vs Math Trainer

The clearest difference is in-app purchases: Groundwater App at none against Math Trainer's 1. Groundwater App also leads on iOS requirement (6.0 vs 16.0). Math Trainer's advantage is update cadence (every 3 weeks vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. Math Trainer sells 1 one-off in-app purchase. Groundwater App asks for nothing beyond the download.

Groundwater App ships an update every 6 months, Math Trainer every 3 weeks. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Groundwater App | Math Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/groundwater-app/id1036868330/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 63 MB | 31 MB |
| Requires iOS | **6.0** | 16.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Koboldgames GmbH](https://appshunter.io/developer/933187097) | [Myroslava Zazuliak](https://appshunter.io/developer/1860692193) |

## What reviewers say

### Groundwater App

[App page](https://appshunter.io/ios/app/groundwater-app/id1036868330)

Explore the origins, uses, and river connections of groundwater through three engaging chapters. Conduct experiments in a virtual lab to deepen your understanding of groundwater behavior.

**Highlights:** Three learning chapters, Groundwater origins explained, Groundwater uses detailed, Link between groundwater and rivers, Virtual groundwater lab, Interactive experiments

**Features:** macOS Compatibility

**In-app purchases:** none


### Math Trainer

[App page](https://appshunter.io/ios/app/math-trainer-vectors/id6756442899)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium-Upgrade | $0.99 | one-time |


## Frequently asked questions

### Is Groundwater App free?

Groundwater App is free to download, with no in-app purchases.

### Is Math Trainer free?

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

### Do Groundwater App or Math Trainer have ads?

Neither Groundwater App nor Math Trainer shows ads.

### Which is updated more often, Groundwater App or Math Trainer?

Groundwater App ships an update every 6 months, and Math Trainer every 3 weeks. Most recently, Groundwater App was updated on November 2, 2026 and Math Trainer on November 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.*