# Train4Science vs Classroom Noise Meter

The clearest difference is in-app purchases: Train4Science at none against Classroom Noise Meter's 3. Train4Science also leads on iOS requirement (12.0 vs 17.0). Classroom Noise Meter's advantage is update cadence (every 2 weeks vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. Classroom Noise Meter sells 3 in-app purchases, starting at $1.99 per month. Train4Science asks for nothing beyond the download.

Train4Science ships an update every 5 months, Classroom Noise Meter every 2 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Train4Science | Classroom Noise Meter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Size | 146 MB | 18 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Playersjourney GmbH](https://appshunter.io/developer/1461683218) | [Felix Leitenberger](https://appshunter.io/developer/1488329664) |

## What reviewers say

### Train4Science

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Classroom Noise Meter

[App page](https://appshunter.io/ios/app/classroom-noise-meter-ruhe/id6817002986)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ruhe Pro – Monthly | $1.99 | per month |
| Ruhe Pro – Yearly | $8.99 | per year |
| Ruhe Pro – Lifetime | $22.99 | one-time |


## Frequently asked questions

### Is Train4Science free?

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

### Is Classroom Noise Meter free?

Classroom Noise Meter is free to download, with in-app purchases available.

### Do Train4Science or Classroom Noise Meter have ads?

Neither Train4Science nor Classroom Noise Meter shows ads.

### Which is updated more often, Train4Science or Classroom Noise Meter?

Train4Science ships an update every 5 months, and Classroom Noise Meter every 2 weeks. Most recently, Train4Science was updated on November 3, 2026 and Classroom Noise Meter on October 31, 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.*