# MRU4u vs OELCHECK 4.0

The clearest difference is update cadence: MRU4u at every 5 weeks against OELCHECK 4.0's every 3 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, OELCHECK 4.0 every 3 months. The most recent releases landed on June 9, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | MRU4u | OELCHECK 4.0 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 136 MB | 24 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MRU Messgeräte für Rauchgase und Umweltschutz GmbH](https://appshunter.io/developer/1110341400) | [OELCHECK GmbH](https://appshunter.io/developer/1210793145) |

## 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


### OELCHECK 4.0

[App page](https://appshunter.io/ios/app/oelcheck-40/id1474067028)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MRU4u free?

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

### Is OELCHECK 4.0 free?

OELCHECK 4.0 is free to download, with no in-app purchases.

### Do MRU4u or OELCHECK 4.0 have ads?

Neither MRU4u nor OELCHECK 4.0 shows ads.

### Which is updated more often, MRU4u or OELCHECK 4.0?

MRU4u ships an update every 5 weeks, and OELCHECK 4.0 every 3 months. Most recently, MRU4u was updated on June 9, 2026 and OELCHECK 4.0 on September 8, 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.*