# Severe Service vs testo Smart

The clearest difference is rating: Severe Service at 4.7 against testo Smart's 2.7. Severe Service also leads on in-app purchases (none vs 5) and iOS requirement (13.2 vs 18.0). testo Smart's advantage is ratings volume (170 vs 7). On price, update cadence, 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. Severe Service asks for nothing beyond the download.

Severe Service holds the better App Store score, 4.7 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 170 ratings behind it against 7, so its average is the more settled of the two.

Severe Service ships an update monthly, testo Smart every 2 months. The most recent releases landed on September 28, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Severe Service | testo Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (7 ratings)](https://appshunter.io/ios/app/severe-service/id1436753584/reviews)** | [2.7 (170 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) |
| Number of ratings | 7 | **170** |
| Positive reviews | — | 16.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 26 MB | 195 MB |
| Requires iOS | **13.2** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Emerson Process Management](https://appshunter.io/developer/561985742) | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) |

## What reviewers say

### Severe Service

[App page](https://appshunter.io/ios/app/severe-service/id1436753584)

This app helps users perform initial sizing for control valves, diagnose issues by selecting symptoms, and explore severe service applications across various industries. It also provides access to a technical library with videos and PDFs, a product catalog, and a contact feature for expert assistance.

**Highlights:** Control valve sizing tool, Issue diagnosis by symptom, Industry application explorer, Technical library with videos and PDFs, Fisher product catalog, Keyword search functionality, Direct contact with experts

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Severe Service free?

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

### Is testo Smart free?

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

### Which has better reviews, Severe Service or testo Smart?

Severe Service is rated higher. Severe Service averages 4.7 out of 5 from 7 ratings, while testo Smart averages 2.7 from 170 ratings.

### Do Severe Service or testo Smart have ads?

Neither Severe Service nor testo Smart shows ads.

### Which is updated more often, Severe Service or testo Smart?

Severe Service ships an update monthly, and testo Smart every 2 months. Most recently, Severe Service was updated on September 28, 2026 and testo Smart on October 20, 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.*