# Gin Air Calculator vs testo Smart

The clearest difference is review sentiment: Gin Air Calculator at 100% against testo Smart's 16%. Gin Air Calculator also leads on rating (5.0 vs 2.7) and in-app purchases (none vs 5). testo Smart's advantage is ratings volume (170 vs 1). 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. Gin Air Calculator asks for nothing beyond the download.

Gin Air Calculator 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 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Gin Air Calculator's written reviews are positive against 16% of testo Smart's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Gin Air Calculator | testo Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gin-air-calculator/id1250567115/reviews)** | [2.7 (170 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) |
| Number of ratings | 1 | **170** |
| Positive reviews | **100.0% of reviews** | 16.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 195 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Samuel Jackson, Inc.](https://appshunter.io/developer/356591098) | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) |

## What reviewers say

### Gin Air Calculator

[App page](https://appshunter.io/ios/app/gin-air-calculator/id1250567115)

Easily calculate and log air volume measurements for efficient airflow in cotton gins and other air-based systems. Input pressure and pipe dimensions to get air velocity and volume rates, then log and share your data.

**Highlights:** Calculate air velocity (FPM), Calculate air volume rate (CFM), Log measurements by location, Customizable data points, Share data tables via email, Supports circular pipes/ducts

**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 Gin Air Calculator free?

Gin Air Calculator 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, Gin Air Calculator or testo Smart?

Gin Air Calculator is rated higher. Gin Air Calculator averages 5.0 out of 5 from 1 ratings, while testo Smart averages 2.7 from 170 ratings.

### Do Gin Air Calculator or testo Smart have ads?

Neither Gin Air Calculator nor testo Smart shows ads.

### Which is updated more often, Gin Air Calculator or testo Smart?

Gin Air Calculator ships an update every 2 months, and testo Smart every 2 months. Most recently, Gin Air Calculator was updated on November 2, 2026 and testo Smart on November 7, 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.*