ST BLE Sensor vs ZSWatch
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ST BLE Sensor
This app connects to ST development boards via Bluetooth Low Energy to access sensor data. You can log data to cloud providers, update board firmware, and explore various demo functionalities like environmental sensing and machine learning.
- Access sensor data
- Log data to cloud
- Update board firmware
- Explore demo functionalities
- Bluetooth Low Energy communication
- Motion-sensor data fusion
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The ST BLE Sensor application is used in conjunction with an ST development board and firmware compatible with the BlueST protocol to give you access to all the sensor data, which you can log to different cloud providers, and to update the board firmware directly from a mobile device via the Bluetooth® Low Energy protocol. After discovery ST development board, the app shows you a list of available demos and you can navigate through them to discover the functionalities of your board. Demos can be related about environmental, cloud, audio, board configuration, machine learning and and many other functionalities. The application is built on top of the BlueST SDK library implementing the BlueST protocol and helps you export the data easily via Bluetooth® Low Energy. The application also supports firmware library algorithms like motion-sensor data fusion, activity recognition and pedometer functionality. Both SDK and application source code are freely available at: https://github.com/STMicroelectronics
ZSWatch
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ZSWatch is the official companion app for the ZSWatch open-source smartwatch. Connect via Bluetooth to unlock the full functionality of your DIY smartwatch. FEATURES • Firmware Updates Update your watch firmware wirelessly over Bluetooth. Download official releases directly from GitHub or load local firmware files. Includes LVGL resource updates for custom watch faces. • Health & Activity Tracking View your daily steps, heart rate data, and activity history. Track your fitness progress with beautiful charts and statistics. • Weather Sync Get current weather conditions on your watch. The app automatically syncs weather data based on your location. • HTTP Relay Relay HTTP requests from the watch over BLE allowing watch to fetch information from internet. • GPS Location Relay Share your phone's GPS with your watch for accurate location data during outdoor activities and workouts. • Developer Tools Built-in tools for developers and enthusiasts: BLE communication logs, sensor data visualization, and device diagnostics. • Battery Analytics Monitor your watch's battery level and track charging patterns over time. REQUIREMENTS • ZSWatch smartwatch (github.com/ZSWatch/ZSWatch) OPEN SOURCE ZSWatch Companion App is open source. View the code, report issues, and contribute at github.com/ZSWatch/ZSWatch-App
Screenshots
Verdict
The clearest difference is update cadence: ZSWatch at every 2 days against ST BLE Sensor's every 2 months. ZSWatch also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ST BLE Sensor ships an update every 2 months, ZSWatch every 2 days. The most recent releases landed on October 15, 2026 and October 4, 2026 respectively.
| Parameter | ST BLE Sensor | ZSWatch |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (10 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 10 — better | — |
| Update frequency | Every 2 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 55 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | STMicroelectronics | Jakob Krantz |
In-app purchases
ST BLE Sensor
No in-app purchases
ZSWatch
No in-app purchases








