# testo Smart vs Zenflow

The clearest difference is in-app purchases: Zenflow at none against testo Smart's 5. Zenflow also leads on update cadence (every 10 days vs every 2 months). testo Smart's advantage is iOS requirement (18.0 vs 26.4). 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. Zenflow asks for nothing beyond the download.

testo Smart ships an update every 2 months, Zenflow every 10 days. The most recent releases landed on November 12, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | testo Smart | Zenflow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (170 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews)** | — |
| Number of ratings | **170** | — |
| Positive reviews | 16.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 195 MB | 4 MB |
| Requires iOS | **18.0** | 26.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [NOBUHIRO KIKUCHI](https://appshunter.io/developer/1895808838) |

## 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


### Zenflow

[App page](https://appshunter.io/ios/app/zenflow-focus-timer-and-habits/id6764499988)

**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 Zenflow free?

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

### Do testo Smart or Zenflow have ads?

Neither testo Smart nor Zenflow shows ads.

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

testo Smart ships an update every 2 months, and Zenflow every 10 days. Most recently, testo Smart was updated on November 12, 2026 and Zenflow on October 28, 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.*