# testo Smart vs Smart Drain Pro

The clearest difference is rating: Smart Drain Pro at 5.0 against testo Smart's 2.7. Smart Drain Pro also leads on in-app purchases (none vs 5) and iOS requirement (12.0 vs 18.0). testo Smart's advantage is ratings volume (167 vs 2) 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. Smart Drain Pro asks for nothing beyond the download.

Smart Drain Pro 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 2, so its average is the more settled of the two.

testo Smart ships an update every 2 months, Smart Drain Pro every 5 months. The most recent releases landed on September 25, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | testo Smart | Smart Drain Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (167 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/smart-drain-pro/id6739188395/reviews)** |
| Number of ratings | **167** | 2 |
| Positive reviews | 16.3% 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 | 23 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [David Sims](https://appshunter.io/developer/1709824648) |

## 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


### Smart Drain Pro

[App page](https://appshunter.io/ios/app/smart-drain-pro/id6739188395)

Automate water heater valve operations with this Bluetooth-enabled scheduler. Set custom times and days for efficient residue removal and device management in residential and industrial settings.

**Highlights:** Bluetooth device control, Automated scheduling, Customizable day and time programming, Residue removal management, Remote device operation

**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 Smart Drain Pro free?

Smart Drain Pro is free to download, with no in-app purchases.

### Which has better reviews, testo Smart or Smart Drain Pro?

Smart Drain Pro is rated higher. testo Smart averages 2.7 out of 5 from 167 ratings, while Smart Drain Pro averages 5.0 from 2 ratings.

### Do testo Smart or Smart Drain Pro have ads?

Neither testo Smart nor Smart Drain Pro shows ads.

### Which is updated more often, testo Smart or Smart Drain Pro?

testo Smart ships an update every 2 months, and Smart Drain Pro every 5 months. Most recently, testo Smart was updated on September 25, 2026 and Smart Drain Pro on June 4, 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.*