# RadonEye Pro vs Backplain

The clearest difference is rating: Backplain at 5.0 against RadonEye Pro's 1.8. RadonEye Pro's advantage is in-app purchases (none vs 2) and iOS requirement (13.0 vs 15.1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Backplain sells 2 in-app purchases, starting at $9.99 per month. RadonEye Pro asks for nothing beyond the download.

Backplain holds the better App Store score, 5.0 against 1.8. Both are backed by a comparable volume of ratings — 5 and 3 respectively.

RadonEye Pro ships an update every 4 weeks, Backplain monthly. The most recent releases landed on September 7, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | RadonEye Pro | Backplain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.8 (5 ratings)](https://appshunter.io/ios/app/radoneye-pro/id1458690374/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/backplain-compare-ai/id6474154184/reviews)** |
| Number of ratings | **5** | 3 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 37 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [FTLab](https://appshunter.io/developer/897369751) | [Backplain Inc.](https://appshunter.io/developer/1719066654) |

## What reviewers say

### RadonEye Pro

[App page](https://appshunter.io/ios/app/radoneye-pro/id1458690374)

This app connects to a specialized hardware device to monitor radon levels in real-time. It automatically uploads data to a cloud server for professional home inspectors and radon specialists. The app offers Wi-Fi and Bluetooth connectivity for seamless data access.

**Highlights:** Real-time radon level monitoring, Wi-Fi and Bluetooth connectivity, Automatic data upload to cloud server, Professional radon detection, Dual ionization chamber system, Early reliable data output

**Features:** macOS Compatibility

**In-app purchases:** none


### Backplain

[App page](https://appshunter.io/ios/app/backplain-compare-ai/id6474154184)

Access over 30 AI models in one app to get faster, better answers. Compare responses from multiple AI engines side-by-side to instantly find the smartest solution. Boost productivity for research, writing, coding, and more.

**Highlights:** Access 30+ AI models, Side-by-side response comparison, Boost productivity, Affordable subscription, Private and secure

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Backplain Pro Monthly | $9.99 | per month |
| Backplain Pro Yearly | $99.99 | per year |


## Frequently asked questions

### Is RadonEye Pro free?

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

### Is Backplain free?

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

### Which has better reviews, RadonEye Pro or Backplain?

Backplain is rated higher. RadonEye Pro averages 1.8 out of 5 from 5 ratings, while Backplain averages 5.0 from 3 ratings.

### Do RadonEye Pro or Backplain have ads?

Neither RadonEye Pro nor Backplain shows ads.

### Which is updated more often, RadonEye Pro or Backplain?

RadonEye Pro ships an update every 4 weeks, and Backplain monthly. Most recently, RadonEye Pro was updated on September 7, 2026 and Backplain on June 5, 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.*