# testo 330i App vs YJACK VIEW

The clearest difference is ratings volume: YJACK VIEW at 19 against testo 330i App's 2. testo 330i App's advantage is iOS requirement (12 vs 15.6). On price, rating, review sentiment and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 3.0 for testo 330i App against 2.9 for YJACK VIEW. That said, the two scores are not equally well evidenced: YJACK VIEW has 19 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 38% of testo 330i App's written reviews are positive against 30% of YJACK VIEW's.

testo 330i App ships an update every 4 months, YJACK VIEW every 5 months. The most recent releases landed on October 12, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | testo 330i App | YJACK VIEW |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/testo-330i-app/id1007290554/reviews)** | [2.9 (19 ratings)](https://appshunter.io/ios/app/yjack-view/id1492358956/reviews) |
| Number of ratings | 2 | **19** |
| Positive reviews | **37.5% of reviews** | 30.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | Free | Free |
| Size | 52 MB | 18 MB |
| Requires iOS | **12** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [YELLOW JACKET](https://appshunter.io/developer/924701171) |

## 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


### YJACK VIEW

[App page](https://appshunter.io/ios/app/yjack-view/id1492358956)

This app provides a comprehensive HVAC/R diagnostic solution by integrating with specialized hardware. It allows users to view live data, create and share service reports, and perform detailed system analysis for pressure, temperature, evacuation, and more.

**Highlights:** Live data monitoring, Customizable PDF service reports, Enhanced datalogging, Pressure and temperature analysis, Evacuation monitoring, Psychrometric analysis, Electrical readings

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

**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 YJACK VIEW free?

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

### Which has better reviews, testo 330i App or YJACK VIEW?

testo 330i App is rated higher. testo 330i App averages 3.0 out of 5 from 2 ratings, while YJACK VIEW averages 2.9 from 19 ratings.

### Do testo 330i App or YJACK VIEW have ads?

Neither testo 330i App nor YJACK VIEW shows ads.

### Which is updated more often, testo 330i App or YJACK VIEW?

testo 330i App ships an update every 4 months, and YJACK VIEW every 5 months. Most recently, testo 330i App was updated on October 12, 2026 and YJACK VIEW on October 10, 2026.

---

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