# testo Combustion App vs Appion Central

The clearest difference is rating: Appion Central at 2.8 against testo Combustion App's 1.4. Appion Central also leads on update cadence (every 5 weeks vs every 7 months) and review sentiment (29% vs 13%). testo Combustion App's advantage is iOS requirement (9.3 vs 13.0). 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.

Appion Central holds the better App Store score, 2.8 against 1.4. Both are backed by a comparable volume of ratings — 10 and 14 respectively. Written reviews point the same way: 13% of testo Combustion App's written reviews are positive against 29% of Appion Central's.

testo Combustion App ships an update every 7 months, Appion Central every 5 weeks. The most recent releases landed on September 20, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | testo Combustion App | Appion Central |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.4 (10 ratings)](https://appshunter.io/ios/app/testo-combustion-app/id992414788/reviews) | **[2.8 (14 ratings)](https://appshunter.io/ios/app/appion-central/id1455230837/reviews)** |
| Number of ratings | 10 | **14** |
| Positive reviews | 12.8% of reviews | **28.6% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 62 MB | 35 MB |
| Requires iOS | **9.3** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [Appion Inc.](https://appshunter.io/developer/978979622) |

## What reviewers say

### testo Combustion App

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

Control your testo 330 flue gas analyzer remotely from your smartphone or tablet. Create and send professional PDF reports with photos and your logo directly from the field, ensuring fast and efficient documentation.

**Highlights:** Remote start/stop of measuring instrument, Intuitive touchscreen menu, Graphical trend view, PDF report creation, Export measurement values to CSV, Customizable reports with logo, Bluetooth connectivity (20m range)

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

**In-app purchases:** none


### Appion Central

[App page](https://appshunter.io/ios/app/appion-central/id1455230837)

Manage your HVAC tools and connect to the web portal. This app provides a mobile interface for your Appion products.

**Highlights:** Manage Appion products, Interface with Appion Portal, Mobile tool management

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is testo Combustion App free?

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

### Is Appion Central free?

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

### Which has better reviews, testo Combustion App or Appion Central?

Appion Central is rated higher. testo Combustion App averages 1.4 out of 5 from 10 ratings, while Appion Central averages 2.8 from 14 ratings.

### Do testo Combustion App or Appion Central have ads?

Neither testo Combustion App nor Appion Central shows ads.

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

testo Combustion App ships an update every 7 months, and Appion Central every 5 weeks. Most recently, testo Combustion App was updated on September 20, 2026 and Appion Central on June 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.*