# testo Smart vs YJACK VIEW

The clearest difference is in-app purchases: YJACK VIEW at none against testo Smart's 5. YJACK VIEW also leads on review sentiment (30% vs 16%) and iOS requirement (15.6 vs 18.0). testo Smart's advantage is update cadence (every 2 months vs every 5 months) and ratings volume (167 vs 19). On price, rating, ads and device support there is nothing between them.

Both are free to download. testo Smart sells 5 in-app purchases, starting at $6.99 per month. YJACK VIEW asks for nothing beyond the download.

YJACK VIEW holds the better App Store score, 2.9 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 167 ratings behind it against 19, so its average is the more settled of the two. Written reviews point the same way: 16% of testo Smart's written reviews are positive against 30% of YJACK VIEW's.

testo Smart ships an update every 2 months, YJACK VIEW every 5 months. The most recent releases landed on October 13, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | testo Smart | YJACK VIEW |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (167 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) | **[2.9 (19 ratings)](https://appshunter.io/ios/app/yjack-view/id1492358956/reviews)** |
| Number of ratings | **167** | 19 |
| Positive reviews | 16.3% of reviews | **30.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 195 MB | 18 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad | **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 Smart

[App page](https://appshunter.io/ios/app/testo-smart/id1482139629)

This app supports measurements for refrigeration, HVAC, and heating systems. It also aids in food safety, frying oil quality, and indoor climate monitoring. Quickly interpret data, create digital reports with photos, and send them via email.

**Highlights:** All-in-one system measurements, Graphical display of measured values, Digital PDF/CSV measurement reports, Email report sharing, Leak test analysis, Automatic refrigerant charging, Indoor air quality monitoring

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Multi-site measurement | $6.99 | per month |
| Air balancing | $9.99 | per month |
| Multi-site measurement | $69.90 | per year |
| Air balancing | $99.90 | per year |
| Logging digital manifold | $44.99 | one-time |

**What reviewers like**

- 👍 Good app with some features
- 🚀 Great product
- 🚀 Useful app for measurements

**What reviewers complain about**

- 🐛 App won't connect
- 🐛 Connectivity issues
- 🐛 Unreliable connection
- 🐛 Forced updates
- 🐛 Laggy and unresponsive UI

**Reported bugs**

- App won't connect to devices
- Compatibility issues with newer iOS versions
- Frequent crashes and freezes
- Inability to save favorite refrigerants
- Measurement data not displaying properly

**Requested features**

- Add option to toggle Bluetooth discovery
- Improve Bluetooth range
- Add ability to customize colors and graphs
- Improve data export functionality
- Add option to name sensors


### 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 Smart free?

testo Smart is free to download, with in-app purchases available.

### Is YJACK VIEW free?

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

### Which has better reviews, testo Smart or YJACK VIEW?

YJACK VIEW is rated higher. testo Smart averages 2.7 out of 5 from 167 ratings, while YJACK VIEW averages 2.9 from 19 ratings.

### Do testo Smart or YJACK VIEW have ads?

Neither testo Smart nor YJACK VIEW shows ads.

### Which is updated more often, testo Smart or YJACK VIEW?

testo Smart ships an update every 2 months, and YJACK VIEW every 5 months. Most recently, testo Smart was updated on October 13, 2026 and YJACK VIEW on October 10, 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.*