# Reflex Pro App vs h,x Calculator

The clearest difference is iOS requirement: h,x Calculator at 7.0 against Reflex Pro App'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.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 15, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Reflex Pro App | h,x Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 44.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free | Free |
| Size | 19 MB | 27 MB |
| Requires iOS | 15.0 | **7.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ConSoft](https://appshunter.io/developer/397747217) | [Condair GmbH](https://appshunter.io/developer/903871077) |

## What reviewers say

### Reflex Pro App

[App page](https://appshunter.io/ios/app/reflex-pro-app/id424178409)

This app provides instant calculations for pressure maintenance in heating, solar, and hot water systems. It helps define pressures and account for water hardness, aiding in project surveys and on-site consultations for accurate system assessments.

**Highlights:** Pressure maintenance calculations, Expansion vessel calculation, Upstream and filling pressure definition, Water hardness consideration, VDI 2035 compliance, On-site project surveys

**Features:** macOS Compatibility

**In-app purchases:** none


### h,x Calculator

[App page](https://appshunter.io/ios/app/hx-calculator/id903871074)

This software calculates air condition changes during adiabatic or isothermal humidification processes. It determines air states before and after humidification, humidification power, and heating power. The app supports both metric and imperial units.

**Highlights:** Calculate air condition changes, Determine humidification power, Calculate heating power, Generate h,x diagram, Metric and imperial unit support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Reflex Pro App free?

Reflex Pro App is free to download, with no in-app purchases.

### Is h,x Calculator free?

h,x Calculator is free to download, with no in-app purchases.

### Do Reflex Pro App or h,x Calculator have ads?

Neither Reflex Pro App nor h,x Calculator shows ads.

### Which is updated more often, Reflex Pro App or h,x Calculator?

Reflex Pro App ships an update every 4 months, and h,x Calculator every 4 months. Most recently, Reflex Pro App was updated on October 15, 2026 and h,x Calculator on October 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*