# Radon Sniffer vs Weight Log

The clearest difference is in-app purchases: Radon Sniffer at none against Weight Log's 7. Weight Log's advantage is update cadence (weekly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Weight Log sells 7 in-app purchases, starting at $2.99 per month. Radon Sniffer asks for nothing beyond the download.

Radon Sniffer ships an update every 2 months, Weight Log weekly. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Radon Sniffer | Weight Log |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free | — |
| Size | 14 MB | 126 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Environmental Instruments Canada Inc.](https://appshunter.io/developer/1223543930) | [迪 王](https://appshunter.io/developer/1598269381) |

## What reviewers say

### Radon Sniffer

[App page](https://appshunter.io/ios/app/radon-sniffer/id1271539715)

This utility app connects to a specific radon detection device via Bluetooth. It allows users to monitor radon levels in real-time, set up timed measurements, and configure device settings for expanded functionality.

**Highlights:** Real-time radon level monitoring, Bluetooth Low Energy connectivity, Timed run functionality, Configurable device settings, Companion app for CT007R hardware

**Features:** macOS Compatibility

**In-app purchases:** none


### Weight Log

[App page](https://appshunter.io/ios/app/weight-log-track-progress/id6758137970)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 包月会员 | $2.99 | per month |
| 年度会员 | $3.99 | per year |
| Monthly Membership | $3.99 | per month |
| 季度会员 | $4.99 | per 3 months |
| Quarterly Membership | $7.99 | per 3 months |
| 年度会员 | $9.99 | per year |
| Annual Membership | $11.99 | per year |


## Frequently asked questions

### Is Radon Sniffer free?

Radon Sniffer is free to download, with no in-app purchases.

### Is Weight Log free?

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

### Do Radon Sniffer or Weight Log have ads?

Neither Radon Sniffer nor Weight Log shows ads.

### Which is updated more often, Radon Sniffer or Weight Log?

Radon Sniffer ships an update every 2 months, and Weight Log weekly. Most recently, Radon Sniffer was updated on September 24, 2026 and Weight Log on September 22, 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.*