Comparison

Sensor Data Recorder vs HemiPhysioData

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sensor Data Recorder

This utility app records gyroscope, accelerometer, and audio data from your device. Export your recorded data as CSV or M4A files for further processing, particularly for machine learning applications. Your data remains private and is only accessible on your device.

Highlights
  • Record gyroscope and accelerometer data
  • Record audio simultaneously
  • Label recordings for ML workflow
  • Adjust data capture frequency
  • Download or email data
  • Export as CSV and M4A
Features
Read full description

A lightweight utility in order to quickly and securely record CoreMotion gyroscope and accelerometer data together with audio data. CoreMotion data can be downloaded as a CSV (comma separated values) file and audio can be downloaded as a standard m4a file. Your data is only available on your device. Data will not be shared with others and will not be uploaded centrally. Data can then be used for further processing, mostly for machine learning (ML) / deep learning purposes. Key highlights: - Record gyroscope and accelerometer data directly from your phone's CoreMotion module - In parallel, record audio from your phone's microphone - Assign a label to each recording which can be later used in your machine learning workflow - Choose the frequency of the data to be captured per second - Download the captured data or send it via email - Further process the data within your favorite machine learning environment, e.g. using Python

About

HemiPhysioData

This app collects raw and processed sensor data from your Apple Watch, including accelerometer and gyroscope readings. It allows you to select activities, preferences, and then exports the data as a CSV file to your iPhone for analysis. Ideal for tracking movement and Range of Motion (ROM) measurements.

Highlights
  • Collects raw and processed sensor data
  • User-friendly activity selection
  • Exports data as CSV files
  • Supports accelerometer and gyroscope
  • Configurable sampling rate
  • Haptic feedback for logging alerts
Read full description

HemiPhysioData serves as an Apple Watch app designed to gather both raw and processed data from the watch's built-in sensors, such as the accelerometer and gyroscope. Its user-friendly interface allows users to effortlessly select different activities and preferences. The collected sensor data, along with additional specified values, is then neatly stored in a CSV file. These CSV files can be easily transferred to the user's iPhone for further processing and analysis. The app is specifically tailored for individuals seeking to collect movement data or Range of Motion (ROM) measurements, with the added benefit of utilizing the data for analytics and machine learning. Users have the flexibility to choose the activity type, movement type, sampling rate (samples per second), and indicate which wrist they wear the watch on, as well as whether it's their dominant or non-dominant side. Some details on screenshots: UID: Predefined twenty users (U01-U20) Activity: Movements (upper limb), Walking, Running, Misc Move Type: It corresponds to the selected activity Interval-Hertz: Samples per second (up to 100 samples per second) Dominant Side: Enable it when watch is on wrist of dominant arm Right Wrist: Enable it when watch is on right wrist Haptic-Feedback: When enabled, the user can set the ‘Starts In’ time and the logging ‘Duration'. The user gets the alert when the logging starts (when the starts-in time finishes) and ends (when the duration finishes). Use this option to log activity related data only. It saves from data cleaning later. Logged Files: Shows all saved CSV files on watch. The user can select a file to send to the iPhone or delete from watch. The following sensor data of the Apple Watch (WatchOS) is saved in the CSV file: - Device Motion Processed Data: roll, pitch, yaw, rotation rate x, rotation rate y, rotation rate z, gravity x, gravity y, gravity z, user acceleration x, user acceleration y, user acceleration z, quaternion x, quaternion y, quaternion z, quaternion z. -Accelerometer Raw Data: Acceleration x, y, and z

Screenshots

Sensor Data Recorder2 screens
HemiPhysioData3 screens

Verdict

The call

The clearest difference is review sentiment: HemiPhysioData at 100% against Sensor Data Recorder's 50%. On price, update cadence, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Sensor Data Recorder ships an update every 26 months, HemiPhysioData every 18 months. The most recent releases landed on June 6, 2026 and June 4, 2026 respectively.

Scorecard1 real difference · 9 level
Sensor Data Recorder versus HemiPhysioData: the parameters behind the verdict, then further details
ParameterSensor Data RecorderHemiPhysioData
PriceFreeFree
Rating3.0 (2 ratings) — better—
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings2 — better—
Update frequencyEvery 26 monthsEvery 18 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod, Apple Watch — better
Requires iOS14.013.2 — better
Further details — not scored
Size8 MB2 MB
Age rating4+4+
DeveloperNils AckermannMoez ur Rehman

Customer experience

Sensor Data Recorder

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

HemiPhysioData

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sensor Data Recorder

No in-app purchases

None

HemiPhysioData

No in-app purchases

Questions

Is Sensor Data Recorder free?
Sensor Data Recorder is free to download, with no in-app purchases.
Is HemiPhysioData free?
HemiPhysioData is free to download, with no in-app purchases.
Do Sensor Data Recorder or HemiPhysioData have ads?
Neither Sensor Data Recorder nor HemiPhysioData shows ads.
Which is updated more often, Sensor Data Recorder or HemiPhysioData?
Sensor Data Recorder ships an update every 26 months, and HemiPhysioData every 18 months. Most recently, Sensor Data Recorder was updated on June 6, 2026 and HemiPhysioData on June 4, 2026.

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