# OELCHECK 4.0 vs Check

The clearest difference is update cadence: Check at every 6 weeks against OELCHECK 4.0's every 3 months. Check also leads on iOS requirement (13.0 vs 15.0). 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, Check every 6 weeks. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | OELCHECK 4.0 | Check |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 8 MB | 47 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [OELCHECK GmbH](https://appshunter.io/developer/1210793145) | [R. O. E. GmbH](https://appshunter.io/developer/1379037163) |

## 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


### Check

[App page](https://appshunter.io/ios/app/check-it-audit-tool/id1534128511)

**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 Check free?

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

### Do OELCHECK 4.0 or Check have ads?

Neither OELCHECK 4.0 nor Check shows ads.

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

OELCHECK 4.0 ships an update every 3 months, and Check every 6 weeks. Most recently, OELCHECK 4.0 was updated on November 3, 2026 and Check on October 25, 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.*