# testo Smart vs Steam Worx

The clearest difference is rating: Steam Worx at 5.0 against testo Smart's 2.7. Steam Worx also leads on in-app purchases (none vs 5) and iOS requirement (15.0 vs 18.0). testo Smart's advantage is ratings volume (170 vs 2). 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. Steam Worx asks for nothing beyond the download.

Steam Worx holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 170 ratings behind it against 2, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 12, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | testo Smart | Steam Worx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (170 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/steam-worx/id6467222774/reviews)** |
| Number of ratings | **170** | 2 |
| Positive reviews | 16.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 195 MB | 18 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [Watson McDaniel Company](https://appshunter.io/developer/1708408873) |

## 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


### Steam Worx

[App page](https://appshunter.io/ios/app/steam-worx/id6467222774)

This application assists engineers and technicians with complex fluid dynamics calculations. It provides tools for sizing and selecting pressure relief valves, control valves for steam and water, and heat exchangers. The app also includes calculators for pipe sizing, noise levels, and unit conversions.

**Highlights:** Pilot-Operated PRV Sizing, Control Valve Sizing (Steam & Water), Heat Exchanger Sizing, Pipe Sizing & Velocities, Noise Level & Cavitation Calculations, Unit Conversions

**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 Steam Worx free?

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

### Which has better reviews, testo Smart or Steam Worx?

Steam Worx is rated higher. testo Smart averages 2.7 out of 5 from 170 ratings, while Steam Worx averages 5.0 from 2 ratings.

### Do testo Smart or Steam Worx have ads?

Neither testo Smart nor Steam Worx shows ads.

### Which is updated more often, testo Smart or Steam Worx?

testo Smart ships an update every 2 months, and Steam Worx every 2 months. Most recently, testo Smart was updated on November 12, 2026 and Steam Worx on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*