# HyTools vs testo Combustion App

The clearest difference is rating: HyTools at 4.0 against testo Combustion App's 1.4. HyTools also leads on review sentiment (50% vs 13%) and update cadence (every 6 weeks vs every 9 months). testo Combustion App's advantage is iOS requirement (13.0 vs 15.0). On price, ratings volume, 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.

HyTools holds the better App Store score, 4.0 against 1.4. Both are backed by a comparable volume of ratings — 5 and 10 respectively. Written reviews point the same way: 50% of HyTools's written reviews are positive against 13% of testo Combustion App's.

HyTools ships an update every 6 weeks, testo Combustion App every 9 months. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | HyTools | testo Combustion App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (5 ratings)](https://appshunter.io/ios/app/hytools/id537674477/reviews)** | [1.4 (10 ratings)](https://appshunter.io/ios/app/testo-combustion-app/id992414788/reviews) |
| Number of ratings | 5 | **10** |
| Positive reviews | **50.0% of reviews** | 12.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 9 months |
| Monetization | Free | Free |
| Size | 114 MB | 43 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [IMI Hydronic Engineering International SA](https://appshunter.io/developer/508015425) | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) |

## What reviewers say

### HyTools

[App page](https://appshunter.io/ios/app/hytools/id537674477)

This app provides HVAC professionals with a comprehensive suite of hydronic calculation tools. It assists with tasks like valve sizing, pressure drop calculations, and radiator power estimation. The tool offers unit conversion and language selection for user convenience.

**Highlights:** Hydronic calculator, Valve sizing and presetting, Radiator power estimation, Pipe sizing, Unit conversion, Pressure maintenance calculation

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

**In-app purchases:** none


### testo Combustion App

[App page](https://appshunter.io/ios/app/testo-combustion-app/id992414788)

Control your flue gas analyzer remotely and create on-site reports with photos and custom logos. Send documentation instantly to your office or customers. Track changes with graphical trend views and export data in CSV format.

**Highlights:** Remote instrument control, On-site report creation, Photo integration in reports, Custom logo reports, Graphical trend view, CSV data export, Bluetooth connectivity

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

**In-app purchases:** none


## Frequently asked questions

### Is HyTools free?

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

### Is testo Combustion App free?

testo Combustion App is free to download, with no in-app purchases.

### Which has better reviews, HyTools or testo Combustion App?

HyTools is rated higher. HyTools averages 4.0 out of 5 from 5 ratings, while testo Combustion App averages 1.4 from 10 ratings.

### Do HyTools or testo Combustion App have ads?

Neither HyTools nor testo Combustion App shows ads.

### Which is updated more often, HyTools or testo Combustion App?

HyTools ships an update every 6 weeks, and testo Combustion App every 9 months. Most recently, HyTools was updated on November 1, 2026 and testo Combustion App on November 5, 2026.

---

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