# Herz Stromax R vs KAN Quick Surface

The clearest difference is iOS requirement: Herz Stromax R at 11.0 against KAN Quick Surface's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Herz Stromax R ships an update every 7 months, KAN Quick Surface every 13 months. The most recent releases landed on October 2, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Herz Stromax R | KAN Quick Surface |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/herz-stromax-r/id824165722/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 13 months |
| Monetization | Free | — |
| Size | 4 MB | 36 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandar Jovanovic](https://appshunter.io/developer/598691474) | [KAN-therm GmbH](https://appshunter.io/developer/1088230769) |

## What reviewers say

### Herz Stromax R

[App page](https://appshunter.io/ios/app/herz-stromax-r/id824165722)

This application calculates optimal balancing valve presets for HVAC systems. It visually highlights valves within the optimal operational range, replacing manual data sheet lookups with an intuitive interface. All calculations are verified and official.

**Highlights:** Optimal valve preset calculation, HVAC system condition input, Visual operational range highlighting, Replaces data sheet procedures, Verified laboratory values

**Features:** macOS Compatibility

**In-app purchases:** none


### KAN Quick Surface

[App page](https://appshunter.io/ios/app/kan-quick-surface/id1243377753)

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

**In-app purchases:** none


## Frequently asked questions

### Is Herz Stromax R free?

Herz Stromax R is free to download, with no in-app purchases.

### Is KAN Quick Surface free?

KAN Quick Surface is free to download, with no in-app purchases.

### Do Herz Stromax R or KAN Quick Surface have ads?

Neither Herz Stromax R nor KAN Quick Surface shows ads.

### Which is updated more often, Herz Stromax R or KAN Quick Surface?

Herz Stromax R ships an update every 7 months, and KAN Quick Surface every 13 months. Most recently, Herz Stromax R was updated on October 2, 2026 and KAN Quick Surface on October 24, 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.*