# Klim vs Train4Science

The clearest difference is update cadence: Train4Science at every 5 months against Klim's every 21 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Klim ships an update every 21 months, Train4Science every 5 months. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Klim | Train4Science |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 5 months** |
| Size | 80 MB | 146 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Paedagogische Hochschule Heidelberg](https://appshunter.io/developer/1662906000) | [Playersjourney GmbH](https://appshunter.io/developer/1461683218) |

## What reviewers say

### Klim

[App page](https://appshunter.io/ios/app/klimreaction/id6450664328)

**In-app purchases:** none


### Train4Science

[App page](https://appshunter.io/ios/app/train4science/id6462454803)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Klim free?

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

### Is Train4Science free?

Train4Science is free to download, with no in-app purchases.

### Do Klim or Train4Science have ads?

Neither Klim nor Train4Science shows ads.

### Which is updated more often, Klim or Train4Science?

Klim ships an update every 21 months, and Train4Science every 5 months. Most recently, Klim was updated on October 15, 2026 and Train4Science on October 6, 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.*