# testo Smart vs PDF Impact

The clearest difference is ads: testo Smart at none against PDF Impact's shown. PDF Impact's advantage is iOS requirement (15.5 vs 18.0). On price, update cadence, in-app purchases 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 and PDF Impact sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | testo Smart | PDF Impact |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (170 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews)** | — |
| Number of ratings | **170** | — |
| Positive reviews | 16.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 195 MB | 85 MB |
| Requires iOS | 18.0 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) | [Senthil Kumar Rangaiyan](https://appshunter.io/developer/1589605125) |

## 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


### PDF Impact

[App page](https://appshunter.io/ios/app/pdf-impact-editor-and-reader/id6788404460)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Impact Monthly | $1.99 | per month |
| 3 Months (Save 16%) | $4.99 | per 3 months |


## Frequently asked questions

### Is testo Smart free?

testo Smart is free to download, with in-app purchases available.

### Is PDF Impact free?

PDF Impact is free to download, with in-app purchases available.

### Do testo Smart or PDF Impact have ads?

PDF Impact shows ads; testo Smart does not.

### Which is updated more often, testo Smart or PDF Impact?

testo Smart ships an update every 2 months, and PDF Impact every 2 months. Most recently, testo Smart was updated on November 3, 2026 and PDF Impact on October 24, 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.*