# Watch Sensor Logger vs Ratakirja

The clearest difference is in-app purchases: Watch Sensor Logger at none against Ratakirja's 1. Watch Sensor Logger also leads on device support (3 vs 1). Ratakirja's advantage is ads (none vs shown) and update cadence (every 9 days vs every 25 months). On price and iOS requirement there is nothing between them.

Both are free to download. Ratakirja sells 1 in-app purchase, starting at $8.99 per year. Watch Sensor Logger asks for nothing beyond the download.

Watch Sensor Logger ships an update every 25 months, Ratakirja every 9 days. The most recent releases landed on October 21, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Watch Sensor Logger | Ratakirja |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/watch-sensor-logger/id1634449655/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 25 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 17 MB | 69 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [yuya kanbetsunawa](https://appshunter.io/developer/1597026161) | [PERTTI OLAVI LOENNROTH](https://appshunter.io/developer/1885949067) |

## What reviewers say

### 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


### Ratakirja

[App page](https://appshunter.io/ios/app/ratakirja/id6760729831)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ratakirja Annual | $8.99 | per year |


## Frequently asked questions

### Is Watch Sensor Logger free?

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

### Is Ratakirja free?

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

### Do Watch Sensor Logger or Ratakirja have ads?

Watch Sensor Logger shows ads; Ratakirja does not.

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

Watch Sensor Logger ships an update every 25 months, and Ratakirja every 9 days. Most recently, Watch Sensor Logger was updated on October 21, 2026 and Ratakirja on October 12, 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.*