Comparison

HemiPhysioData vs Acc.elerometer

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

Head to head
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 β€˜Starts In’ time and the logging β€˜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

About

Acc.elerometer

Features
Read full description

Transform your device into a powerful motion sensor laboratory. Record and visualize real-time data from your device's built-in sensors with interactive charts and precise measurements. Perfect for researchers, developers, students, and anyone interested in understanding device motion. Supported sensors: β€’ Accelerometer – Total device acceleration including gravity (G-force) β€’ User Acceleration – Pure motion acceleration without gravity influence β€’ Gyroscope – Rotation rate around all three axes (rad/s) β€’ Magnetometer – Magnetic field strength and compass data (ΞΌT) β€’ Device Attitude – 3D orientation in space (roll, pitch, yaw) β€’ Gravity – Isolated gravitational force vector (G-force) Key features: β€’ Real-time sensor visualization with smooth, interactive charts β€’ Manual start/stop control for targeted data collection β€’ Export any recording as timestamped CSV files β€’ Customizable recording sessions with precise timing control Export analysis: All sensor data exports as CSV files with timestamps, making it seamless to import into any data analysis platform. Start recording with a single tap and unlock the hidden motion story of your device.

Screenshots

HemiPhysioData3 screens
Acc.elerometer3 screens

Verdict

The call

The clearest difference is iOS requirement: HemiPhysioData at 13.2 against Acc.elerometer's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

HemiPhysioData ships an update every 18 months, Acc.elerometer every 20 months. The most recent releases landed on June 4, 2026 and September 16, 2026 respectively.

Scorecard1 real difference Β· 7 level
HemiPhysioData versus Acc.elerometer: the parameters behind the verdict, then further details
ParameterHemiPhysioDataAcc.elerometer
PriceFreeFree
Positive reviews100.0% of reviewsβ€”
Update frequencyEvery 18 months β€” betterEvery 20 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeβ€”
DevicesiPhone, iPod, Apple Watch β€” betteriPhone, iPad
Requires iOS13.2 β€” better26.0
Further details β€” not scored
Size2 MB10 MB
Age rating4+4+
DeveloperMoez ur RehmanPantiukhin Andrei

In-app purchases

None

HemiPhysioData

No in-app purchases

None

Acc.elerometer

No in-app purchases

Questions

Is HemiPhysioData free?
HemiPhysioData is free to download, with no in-app purchases.
Is Acc.elerometer free?
Acc.elerometer is free to download, with no in-app purchases.
Do HemiPhysioData or Acc.elerometer have ads?
Neither HemiPhysioData nor Acc.elerometer shows ads.
Which is updated more often, HemiPhysioData or Acc.elerometer?
HemiPhysioData ships an update every 18 months, and Acc.elerometer every 20 months. Most recently, HemiPhysioData was updated on June 4, 2026 and Acc.elerometer on September 16, 2026.

Other comparisons