# testo Smart vs Ductulator

The clearest difference is rating: testo Smart at 2.7 against Ductulator's 1.0. testo Smart also leads on ratings volume (167 vs 2) and review sentiment (16% vs 0%). Ductulator's advantage is in-app purchases (none vs 5) and update cadence (weekly vs every 2 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. Ductulator asks for nothing beyond the download.

testo Smart holds the better App Store score, 2.7 against 1.0. That said, the two scores are not equally well evidenced: testo Smart has 167 ratings behind it against 2, 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 0% of Ductulator's.

testo Smart ships an update every 2 months, Ductulator weekly. The most recent releases landed on October 13, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | testo Smart | Ductulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (167 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews)** | [1.0 (2 ratings)](https://appshunter.io/ios/app/ductulator/id1528030964/reviews) |
| Number of ratings | **167** | 2 |
| Positive reviews | **16.3% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 195 MB | 14 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [Simon Leroux](https://appshunter.io/developer/1513421859) |

## 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


### Ductulator

[App page](https://appshunter.io/ios/app/ductulator/id1528030964)

This app provides a simple and efficient tool for calculating the dimensions of square ventilation ducts. It's designed for engineers, architects, and contractors to generate data for mechanical ventilation, cooling, and HVAC projects. Quickly validate residential and commercial solutions with this easy-to-use calculator.

**Highlights:** Calculate equivalent round diameter of square ducts, Convert square duct dimensions by volume ratio, Provide metric equivalence, Validate residential and commercial solutions, Designed for engineers and architects

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is testo Smart free?

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

### Is Ductulator free?

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

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

testo Smart is rated higher. testo Smart averages 2.7 out of 5 from 167 ratings, while Ductulator averages 1.0 from 2 ratings.

### Do testo Smart or Ductulator have ads?

Neither testo Smart nor Ductulator shows ads.

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

testo Smart ships an update every 2 months, and Ductulator weekly. Most recently, testo Smart was updated on October 13, 2026 and Ductulator on September 26, 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.*