# Smart Sensor vs Watchlog Bluetooth

The clearest difference is update cadence: Smart Sensor at every 2 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.

Smart Sensor ships an update every 2 weeks, Watchlog Bluetooth every 2 months. The most recent releases landed on September 19, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Smart Sensor | Watchlog Bluetooth |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | — | Free |
| Size | 40 MB | 25 MB |
| Requires iOS | **12.1** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Supply Fuel Solutions Limited](https://appshunter.io/developer/1670884145) | [Hydrotechnik UK Test Engineering Ltd](https://appshunter.io/developer/1515531717) |

## What reviewers say

### Smart Sensor

[App page](https://appshunter.io/ios/app/smart-sensor/id1670884143)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Smart Sensor free?

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

### Is Watchlog Bluetooth free?

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

### Do Smart Sensor or Watchlog Bluetooth have ads?

Neither Smart Sensor nor Watchlog Bluetooth shows ads.

### Which is updated more often, Smart Sensor or Watchlog Bluetooth?

Smart Sensor ships an update every 2 weeks, and Watchlog Bluetooth every 2 months. Most recently, Smart Sensor was updated on September 19, 2026 and Watchlog Bluetooth on September 23, 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.*