# testo 330i App vs Appion Central

The clearest difference is update cadence: Appion Central at every 5 weeks against testo 330i App's every 4 months. Appion Central also leads on ratings volume (14 vs 2). testo 330i App's advantage is rating (3.0 vs 2.8) and review sentiment (38% vs 29%). On price, ads, in-app purchases and monetization model there is nothing between them.

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

testo 330i App holds the better App Store score, 3.0 against 2.8. That said, the two scores are not equally well evidenced: Appion Central has 14 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 38% of testo 330i App's written reviews are positive against 29% of Appion Central's.

testo 330i App ships an update every 4 months, Appion Central every 5 weeks. The most recent releases landed on October 12, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | testo 330i App | Appion Central |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/testo-330i-app/id1007290554/reviews)** | [2.8 (14 ratings)](https://appshunter.io/ios/app/appion-central/id1455230837/reviews) |
| Number of ratings | 2 | **14** |
| Positive reviews | **37.5% of reviews** | 28.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 52 MB | 35 MB |
| Requires iOS | **12** | 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 330i App

[App page](https://appshunter.io/ios/app/testo-330i-app/id1007290554)

Control your testo 330i flue gas analyzer remotely from your smartphone or tablet. View live measurement values, create detailed PDF reports with photos and your logo, and send them directly from the field. Offers a graphical trend view and data export options.

**Highlights:** Complete analyzer control via smartphone/tablet, Intuitive touchscreen handling, Graphical trend view, PDF report creation, Export measurement values (CSV, ZIV), Insert photos and comments into reports, 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 330i App free?

testo 330i 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 330i App or Appion Central?

testo 330i App is rated higher. testo 330i App averages 3.0 out of 5 from 2 ratings, while Appion Central averages 2.8 from 14 ratings.

### Do testo 330i App or Appion Central have ads?

Neither testo 330i App nor Appion Central shows ads.

### Which is updated more often, testo 330i App or Appion Central?

testo 330i App ships an update every 4 months, and Appion Central every 5 weeks. Most recently, testo 330i App was updated on October 12, 2026 and Appion Central on October 3, 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.*