# Optris calculator vs Refratechnik Connect

The clearest difference is update cadence: Refratechnik Connect at every 2 weeks against Optris calculator's every 2 months. Optris calculator's advantage is iOS requirement (12.0 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.

Optris calculator ships an update every 2 months, Refratechnik Connect every 2 weeks. The most recent releases landed on October 27, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Optris calculator | Refratechnik Connect |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 31 MB | 5 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Optris GmbH](https://appshunter.io/developer/1619077973) | [Refratechnik Holding GmbH](https://appshunter.io/developer/1284587570) |

## What reviewers say

### Optris calculator

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

**In-app purchases:** none


### Refratechnik Connect

[App page](https://appshunter.io/ios/app/refratechnik-connect/id6475403107)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Optris calculator free?

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

### Is Refratechnik Connect free?

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

### Do Optris calculator or Refratechnik Connect have ads?

Neither Optris calculator nor Refratechnik Connect shows ads.

### Which is updated more often, Optris calculator or Refratechnik Connect?

Optris calculator ships an update every 2 months, and Refratechnik Connect every 2 weeks. Most recently, Optris calculator was updated on October 27, 2026 and Refratechnik Connect on November 4, 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.*