# Watchlog Bluetooth vs Spradow Logger

The clearest difference is update cadence: Spradow Logger at every 4 weeks against Watchlog Bluetooth's every 2 months. On price, ads, 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.

Watchlog Bluetooth ships an update every 2 months, Spradow Logger every 4 weeks. The most recent releases landed on September 23, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Watchlog Bluetooth | Spradow Logger |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | Free | — |
| Size | 25 MB | 29 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hydrotechnik UK Test Engineering Ltd](https://appshunter.io/developer/1515531717) | [Spradow GmbH & Co. KG](https://appshunter.io/developer/1805877915) |

## What reviewers say

### Watchlog Bluetooth

[App page](https://appshunter.io/ios/app/watchlog-bluetooth/id6479214506)

This application facilitates Bluetooth connections for data collection from specific sensors. It is designed to work seamlessly with Hydrotechnik sensors, enabling efficient data transfer and management.

**Highlights:** Bluetooth connectivity, Hydrotechnik sensor support, Data collection, Data management

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

**In-app purchases:** none


### Spradow Logger

[App page](https://appshunter.io/ios/app/spradow-logger/id6744066209)

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

**In-app purchases:** none


## Frequently asked questions

### Is Watchlog Bluetooth free?

Watchlog Bluetooth is free to download, with no in-app purchases.

### Is Spradow Logger free?

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

### Do Watchlog Bluetooth or Spradow Logger have ads?

Neither Watchlog Bluetooth nor Spradow Logger shows ads.

### Which is updated more often, Watchlog Bluetooth or Spradow Logger?

Watchlog Bluetooth ships an update every 2 months, and Spradow Logger every 4 weeks. Most recently, Watchlog Bluetooth was updated on September 23, 2026 and Spradow Logger on September 30, 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.*