# MRU4u vs KÜSTER

The clearest difference is update cadence: MRU4u at every 5 weeks against KÜSTER's every 13 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.

MRU4u ships an update every 5 weeks, KÜSTER every 13 months. The most recent releases landed on June 9, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | MRU4u | KÜSTER |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 13 months |
| Monetization | Free | — |
| Size | 136 MB | 18 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MRU Messgeräte für Rauchgase und Umweltschutz GmbH](https://appshunter.io/developer/1110341400) | [SCT Schiele GmbH](https://appshunter.io/developer/483354490) |

## What reviewers say

### MRU4u

[App page](https://appshunter.io/ios/app/mru4u/id1110341401)

Control MRU Fluegas Monitoring Units remotely via Bluetooth. Transfer and store measured data on your smartphone or tablet, with options to export as CSV or email screenshots. View live data as text or charts, with customizable value displays.

**Highlights:** Bluetooth remote control, Live data display (text/chart), Customizable data views, Data storage on device, CSV data export, Email data screenshots

**Features:** macOS Compatibility

**In-app purchases:** none


### KÜSTER

[App page](https://appshunter.io/ios/app/kuster/id1427292554)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MRU4u free?

MRU4u is free to download, with no in-app purchases.

### Is KÜSTER free?

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

### Do MRU4u or KÜSTER have ads?

Neither MRU4u nor KÜSTER shows ads.

### Which is updated more often, MRU4u or KÜSTER?

MRU4u ships an update every 5 weeks, and KÜSTER every 13 months. Most recently, MRU4u was updated on June 9, 2026 and KÜSTER on September 6, 2026.

---

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