# Combi Valve Sizer vs Thermokon USEapp

The clearest difference is update cadence: Thermokon USEapp at every 3 months against Combi Valve Sizer's every 9 months. Combi Valve Sizer's advantage is iOS requirement (7.0 vs 13.0). 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.

Combi Valve Sizer ships an update every 9 months, Thermokon USEapp every 3 months. The most recent releases landed on October 21, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Combi Valve Sizer | Thermokon USEapp |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 50 MB | 27 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Siemens AG](https://appshunter.io/developer/394503271) | [Thermokon Sensortechnik GmbH](https://appshunter.io/developer/1252644429) |

## What reviewers say

### Combi Valve Sizer

[App page](https://appshunter.io/ios/app/combi-valve-sizer/id504270106)

This app simplifies the selection of specific HVAC components. It guides users through choosing the correct valve and actuator, calculates flow rates, and assists with presetting and commissioning. Users can also tag components and download reports.

**Highlights:** Guided valve and actuator selection, Valve sizing and flow calculation, Valve presetting calculation, Tagging valve location and designation, Commissioning check with reports, Data sheet downloads, Report sharing

**In-app purchases:** none


### Thermokon USEapp

[App page](https://appshunter.io/ios/app/thermokon-useapp/id1252644430)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Combi Valve Sizer free?

Combi Valve Sizer is free to download, with no in-app purchases.

### Is Thermokon USEapp free?

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

### Do Combi Valve Sizer or Thermokon USEapp have ads?

Neither Combi Valve Sizer nor Thermokon USEapp shows ads.

### Which is updated more often, Combi Valve Sizer or Thermokon USEapp?

Combi Valve Sizer ships an update every 9 months, and Thermokon USEapp every 3 months. Most recently, Combi Valve Sizer was updated on October 21, 2026 and Thermokon USEapp on October 5, 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.*