# DataLogger vs testo Smart

The clearest difference is rating: testo Smart at 2.7 against DataLogger's 2.0. testo Smart also leads on ratings volume (167 vs 3) and review sentiment (16% vs 0%). DataLogger's advantage is in-app purchases (none vs 5) and iOS requirement (12.0 vs 18.0). 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. DataLogger asks for nothing beyond the download.

testo Smart holds the better App Store score, 2.7 against 2.0. That said, the two scores are not equally well evidenced: testo Smart has 167 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 0% of DataLogger's written reviews are positive against 16% of testo Smart's.

DataLogger ships an update every 4 months, testo Smart every 2 months. The most recent releases landed on September 17, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | DataLogger | testo Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (3 ratings)](https://appshunter.io/ios/app/datalogger/id611115496/reviews) | **[2.7 (167 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews)** |
| Number of ratings | 3 | **167** |
| Positive reviews | 0.0% of reviews | **16.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 195 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MSR Electronics GmbH](https://appshunter.io/developer/611115499) | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) |

## What reviewers say

### DataLogger

[App page](https://appshunter.io/ios/app/datalogger/id611115496)

Control MSR data loggers from your mobile device. Configure loggers, view sensor data in real-time, and upload recordings to the cloud. Connects to multiple loggers via Bluetooth Low Energy.

**Highlights:** Control MSR data loggers, Configure logger settings, View sensor data online, Record sensor data, Upload data to MSR Smart Cloud, Connect via Bluetooth Low Energy (BLE)

**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 DataLogger free?

DataLogger 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, DataLogger or testo Smart?

testo Smart is rated higher. DataLogger averages 2.0 out of 5 from 3 ratings, while testo Smart averages 2.7 from 167 ratings.

### Do DataLogger or testo Smart have ads?

Neither DataLogger nor testo Smart shows ads.

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

DataLogger ships an update every 4 months, and testo Smart every 2 months. Most recently, DataLogger was updated on September 17, 2026 and testo Smart on October 2, 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.*