# OI Lead Adviser vs testo Smart

The clearest difference is rating: OI Lead Adviser at 3.8 against testo Smart's 2.7. OI Lead Adviser also leads on in-app purchases (none vs 5) and iOS requirement (13.0 vs 18.0). testo Smart's advantage is ratings volume (170 vs 4). 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. OI Lead Adviser asks for nothing beyond the download.

OI Lead Adviser holds the better App Store score, 3.8 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 170 ratings behind it against 4, so its average is the more settled of the two.

OI Lead Adviser ships an update every 3 months, testo Smart every 2 months. The most recent releases landed on October 13, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | OI Lead Adviser | testo Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/oi-lead-adviser/id1137039770/reviews)** | [2.7 (170 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) |
| Number of ratings | 4 | **170** |
| Positive reviews | — | 16.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 195 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [SGS Group Management SA](https://appshunter.io/developer/644270853) | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) |

## What reviewers say

### OI Lead Adviser

[App page](https://appshunter.io/ios/app/oi-lead-adviser/id1137039770)

This mobile tool assists leaders in preparing, conducting, recording, and reporting on leadership visits. It offers guidance on visit procedures, suggests relevant discussion topics based on site type, and allows for easy note-taking and rating. Completed visits are automatically saved and can be emailed for follow-up.

**Highlights:** Prepare and conduct leadership visits, Record visit results and notes, Suggests relevant discussion topics by site type, Intuitive and user-friendly interface, Automatic draft saving, Email completed visit reports

**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 OI Lead Adviser free?

OI Lead Adviser 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, OI Lead Adviser or testo Smart?

OI Lead Adviser is rated higher. OI Lead Adviser averages 3.8 out of 5 from 4 ratings, while testo Smart averages 2.7 from 170 ratings.

### Do OI Lead Adviser or testo Smart have ads?

Neither OI Lead Adviser nor testo Smart shows ads.

### Which is updated more often, OI Lead Adviser or testo Smart?

OI Lead Adviser ships an update every 3 months, and testo Smart every 2 months. Most recently, OI Lead Adviser was updated on October 13, 2026 and testo Smart on October 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*