SensorLog vs buckle. Companion App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SensorLog
Record and stream sensor data from your iPhone, iPad, and Apple Watch. Export data in CSV or JSON format, or send it via TCP, UDP, or HTTP requests. Integrates with Core ML models for advanced analysis.
- Log sensor data up to 100Hz
- Stream data via TCP/UDP or HTTP
- Export data as CSV or JSON
- Remote client/server functionality
- Siri and Shortcuts integration
- Core ML model support
- HealthKit data export from Apple Watch
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With SensorLog you can read sensor data from the iPhone, iPad and Apple Watch. The sensor data can be saved as a file in CSV or JSON format, streamed via TCP/UDP or sent as an HTTP request. The most important functions for iPhone and iPad: - Sensor data can be recorded at up to 100Hz (depending on the iOS device version and sensor type). - Sensor data can be streamed in server or client mode using TCP or UDP. Depending on the network speed and the server or client configuration used, this is possible with up to 100Hz. - Via HTTP(S) GET/POST request, sensor data in JSON format (POST) or form-url encoded (POST and GET) can be transmitted to a REST API with up to 20Hz. - With the SensorLog Remote Client/Server function, an iPad or iPhone can connect as a SensorLog Remote Client to an iPhone or iPad, which takes on the role of SensorLog Remote Server. The client's sensor data can be visualized on the server, and the server can control the clients (start/stop logging, start/stop sending data). - Logging can be started and stopped using Siri and shortcuts. - SensorLog supports Core ML models created with Apple's Create ML app. Log data with SensorLog, train a model with the data in Create ML, load exported models in SensorLog and log the model prediction. Supported Create ML models are: Activity Classifier, Tabular Regressor and Tabular Classifier. - If you have an Apple Watch, HealthKit data such as heart rate, energy used, sleep and movement data can be exported on the watch as a csv or json file and then transferred to your iPhone. Sensor data iPhone / iPad: For sample log files, please visit the SensorLog homepage (link App Support). - CLLocation, CLHeading, CMAccelerometer, CMGyroData, CMMagnetometer, CMDeviceMotion, CMActivity, CMPedometer, CMAltimeter, WLAN and network provider IP addresses, device orientation, battery info, decibels. The most important functions for Apple Watch: - Logging Option 1: Logging duration up to 1 hour Simultaneous logging of all selectable sensor data is supported in the background with up to 50Hz. Individual sensors can be logged with a higher frequency of up to 100Hz. Sending data via HTTP requests is supported. - Logging option 2: Logging duration greater than 1 hour In the background only logging of the accelerometer data with max. 50Hz is supported. In the foreground all sensor data with up to 100Hz. Sending data via HTTP requests is only supported when the app is in the foreground. - Via HTTP(S) GET/POST request, sensor data can be transmitted to a REST API with up to 10Hz in JSON format (POST) or form-url encoded (POST and GET). - The Health Store data feature off the SensorLog Watch app allows you to export HealthKit data like heart rate, energy burned, sleep, and movement data. This data is automatically recorded by your Watch and can be read out and exported by SensorLog as csv or json file and transferred to your iPhone. - Logging can be started and stopped using Siri and Shortcuts. Sensor Data Watch: For sample log files, please visit the SensorLog homepage (link App Support). - CLLocation, CMAccelerometer, CMDeviceMotion, CMActivity, CMPedometer, CMAltimeter, battery info
buckle. Companion App
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The Buckle Companion App Connect easily to your Buckle Robots and enjoy managing them using a beautiful, easy-to-use GUI that supports a live data feed from your deployed Buckle robots. Maintenance crew can easily connect to Buckles by scanning the NFC tags using the Buckle Companion app. Features: - Intuitive UI - Live Data Feed with currently connected Buckle Statistics - Deploy Buckle Robots using Agent Mode - Manually Control Buckle Robots within the Command Core - Visualise collected Data using Map View
Screenshots
Verdict
The clearest difference is price: buckle. Companion App at Free against SensorLog's $2.99. buckle. Companion App also leads on in-app purchases (none vs 4) and update cadence (weekly vs every 2 months). SensorLog's advantage is device support (3 vs 1). On ads and iOS requirement 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
buckle. Companion App is free to download; SensorLog costs $2.99 up front. SensorLog sells 4 one-off in-app purchases. buckle. Companion App asks for nothing beyond the download.
SensorLog ships an update every 2 months, buckle. Companion App weekly. The most recent releases landed on October 18, 2026 and October 5, 2026 respectively.
| Parameter | SensorLog | buckle. Companion App |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.4 (40 ratings) — better | — |
| Positive reviews | 69.0% of reviews | — |
| Number of ratings | 40 — better | — |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 18.0 | 18.0 |
| Further details — not scored | ||
| Size | 4 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Bernd Thomas | David Banziger |
In-app purchases
SensorLog
- Buy me a Coffee ...$0.99
- Spend me an Ice Cream ...$1.99
- Offer me a glas of Wine ...$5.99
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- Invite me for a Cocktail ...$9.99
buckle. Companion App
No in-app purchases
Questions
Is SensorLog free?
Is buckle. Companion App free?
Do SensorLog or buckle. Companion App have ads?
Which is updated more often, SensorLog or buckle. Companion App?
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