# testo Smart vs FAN

The clearest difference is review sentiment: FAN at 100% against testo Smart's 16%. FAN also leads on rating (5.0 vs 2.7) and in-app purchases (none vs 5). testo Smart's advantage is ratings volume (167 vs 6) and update cadence (every 2 months vs every 5 months). 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. FAN asks for nothing beyond the download.

FAN holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 167 ratings behind it against 6, 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 100% of FAN's.

testo Smart ships an update every 2 months, FAN every 5 months. The most recent releases landed on September 20, 2026 and July 7, 2026 respectively.

## The numbers

| Metric | testo Smart | FAN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (167 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/fan-410-installation-reference/id1527588808/reviews)** |
| Number of ratings | **167** | 6 |
| Positive reviews | 16.3% of reviews | **100.0% 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 | 81 MB |
| Requires iOS | 18.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [Johnson Controls, Inc.](https://appshunter.io/developer/503559091) |

## 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


### FAN

[App page](https://appshunter.io/ios/app/fan-410-installation-reference/id1527588808)

This app serves as a digital installation manual for HVAC Bacnet controls. It provides comprehensive guidance for technicians and installers working with these systems. Access detailed information and references directly on your device.

**Highlights:** HVAC Bacnet Controls Installation Manual, Digital Reference Guide, Technical Documentation, Installer Support

**In-app purchases:** none


## Frequently asked questions

### Is testo Smart free?

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

### Is FAN free?

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

### Which has better reviews, testo Smart or FAN?

FAN is rated higher. testo Smart averages 2.7 out of 5 from 167 ratings, while FAN averages 5.0 from 6 ratings.

### Do testo Smart or FAN have ads?

Neither testo Smart nor FAN shows ads.

### Which is updated more often, testo Smart or FAN?

testo Smart ships an update every 2 months, and FAN every 5 months. Most recently, testo Smart was updated on September 20, 2026 and FAN on July 7, 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.*