# QRCode Book vs Watch Sensor Logger

The clearest difference is ads: QRCode Book at none against Watch Sensor Logger's shown. QRCode Book also leads on update cadence (every 2 months vs every 25 months) and iOS requirement (15.6 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

QRCode Book ships an update every 2 months, Watch Sensor Logger every 25 months. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | QRCode Book | Watch Sensor Logger |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 25 months |
| Monetization | — | Free |
| Size | 0 MB | 17 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Jean-Francois Pautex](https://appshunter.io/developer/286566990) | [yuya kanbetsunawa](https://appshunter.io/developer/1597026161) |

## What reviewers say

### QRCode Book

[App page](https://appshunter.io/ios/app/qrcode-book/id1259545293)

**Features:** macOS Compatibility

**In-app purchases:** none


### Watch Sensor Logger

[App page](https://appshunter.io/ios/app/watch-sensor-logger/id1634449655)

Log detailed motion and GPS data from your Apple Watch. Export sensor readings like acceleration, attitude, and location as a CSV file for analysis. This app is exclusively designed for Apple Watch.

**Highlights:** Log sensor data, GPS tracking, Export to CSV, Acceleration logging, Attitude data, Time stamping

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is QRCode Book free?

QRCode Book is free to download, with no in-app purchases.

### Is Watch Sensor Logger free?

Watch Sensor Logger is free to download, with no in-app purchases.

### Do QRCode Book or Watch Sensor Logger have ads?

Watch Sensor Logger shows ads; QRCode Book does not.

### Which is updated more often, QRCode Book or Watch Sensor Logger?

QRCode Book ships an update every 2 months, and Watch Sensor Logger every 25 months. Most recently, QRCode Book was updated on October 8, 2026 and Watch Sensor Logger on October 1, 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.*