# testo Smart vs FSI Inbox

The clearest difference is rating: FSI Inbox at 4.6 against testo Smart's 2.7. FSI Inbox also leads on in-app purchases (none vs 5) and update cadence (monthly vs every 2 months). testo Smart's advantage is ratings volume (170 vs 5). On price, 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. FSI Inbox asks for nothing beyond the download.

FSI Inbox holds the better App Store score, 4.6 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 170 ratings behind it against 5, so its average is the more settled of the two.

testo Smart ships an update every 2 months, FSI Inbox monthly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | testo Smart | FSI Inbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (170 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) | **[4.6 (5 ratings)](https://appshunter.io/ios/app/fsi-inbox/id6670702040/reviews)** |
| Number of ratings | **170** | 5 |
| Positive reviews | 16.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 195 MB | 58 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [Facilities Survey Inc](https://appshunter.io/developer/622634630) |

## 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


### FSI Inbox

[App page](https://appshunter.io/ios/app/fsi-inbox/id6670702040)

This mobile application streamlines work order management for technicians on the go. It offers a personalized experience to quickly complete assigned tasks with easy-to-use workflows for comments, readings, and attachments.

**Highlights:** Work order management, Mobile technician companion, Fast task completion, Enter completion comments, Record procedure readings, Add attachments

**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 FSI Inbox free?

FSI Inbox is free to download, with no in-app purchases.

### Which has better reviews, testo Smart or FSI Inbox?

FSI Inbox is rated higher. testo Smart averages 2.7 out of 5 from 170 ratings, while FSI Inbox averages 4.6 from 5 ratings.

### Do testo Smart or FSI Inbox have ads?

Neither testo Smart nor FSI Inbox shows ads.

### Which is updated more often, testo Smart or FSI Inbox?

testo Smart ships an update every 2 months, and FSI Inbox monthly. Most recently, testo Smart was updated on October 25, 2026 and FSI Inbox on October 24, 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.*