# OELCHECK 4.0 vs mPS Master Audit

The clearest difference is update cadence: mPS Master Audit at every 2 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.

OELCHECK 4.0 ships an update every 3 months, mPS Master Audit every 2 weeks. The most recent releases landed on October 9, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | OELCHECK 4.0 | mPS Master Audit |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 24 MB | 25 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [OELCHECK GmbH](https://appshunter.io/developer/1210793145) | [Mobile Lean S.L.](https://appshunter.io/developer/1478112906) |

## What reviewers say

### OELCHECK 4.0

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

Streamline lubricant and operating fluid sample management. Easily enter data, view lab reports, and manage machine information anytime, even offline. Optimize your analysis kits with this efficient digital tool.

**Highlights:** Sample data entry via QR code or machine search, Offline data entry and online synchronization, View sample status and lab reports, Attach up to five photos per sample, Manage machine data, Optimized analysis kit usage

**Features:** macOS Compatibility

**In-app purchases:** none


### mPS Master Audit

[App page](https://appshunter.io/ios/app/mps-master-audit/id1671559706)

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

**In-app purchases:** none


## Frequently asked questions

### Is OELCHECK 4.0 free?

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

### Is mPS Master Audit free?

mPS Master Audit is free to download, with no in-app purchases.

### Do OELCHECK 4.0 or mPS Master Audit have ads?

Neither OELCHECK 4.0 nor mPS Master Audit shows ads.

### Which is updated more often, OELCHECK 4.0 or mPS Master Audit?

OELCHECK 4.0 ships an update every 3 months, and mPS Master Audit every 2 weeks. Most recently, OELCHECK 4.0 was updated on October 9, 2026 and mPS Master Audit on October 18, 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.*