# AvERPAppRueckErf vs Optris calculator

The clearest difference is update cadence: Optris calculator at every 2 months against AvERPAppRueckErf's every 11 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.

AvERPAppRueckErf ships an update every 11 months, Optris calculator every 2 months. Both last shipped on October 27, 2026.

## The numbers

| Metric | AvERPAppRueckErf | Optris calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 months** |
| Size | 27 MB | 31 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SYNERPY GmbH](https://appshunter.io/developer/1477838524) | [Optris GmbH](https://appshunter.io/developer/1619077973) |

## What reviewers say

### AvERPAppRueckErf

[App page](https://appshunter.io/ios/app/averpapprueckerf/id1542588623)

**Features:** macOS Compatibility

**In-app purchases:** none


### Optris calculator

[App page](https://appshunter.io/ios/app/optris-calculator/id1619077971)

**In-app purchases:** none


## Frequently asked questions

### Is AvERPAppRueckErf free?

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

### Is Optris calculator free?

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

### Do AvERPAppRueckErf or Optris calculator have ads?

Neither AvERPAppRueckErf nor Optris calculator shows ads.

### Which is updated more often, AvERPAppRueckErf or Optris calculator?

AvERPAppRueckErf ships an update every 11 months, and Optris calculator every 2 months. Most recently, AvERPAppRueckErf was updated on October 27, 2026 and Optris calculator on October 27, 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.*