Comparison

HemiPhysioData vs Gdisp

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

Gdisp

Features
Read full description

Easy and simple to get longitudinal and lateral acceleration. This is useful because the information can be projected along with the video recording. Feature - Clock and 2-axis acceleration indicator - LowPassFilter - Zero offset button

Screenshots

HemiPhysioData3 screens
Gdisp2 screens

Verdict

The call

The clearest difference is ads: HemiPhysioData at none against Gdisp's shown. HemiPhysioData also leads on iOS requirement (13.2 vs 15.5). Gdisp's advantage is update cadence (every 4 weeks vs every 18 months). On price, in-app purchases and device support 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, Gdisp every 4 weeks. The most recent releases landed on September 29, 2026 and October 27, 2026 respectively.

Scorecard3 real differences Β· 5 level
HemiPhysioData versus Gdisp: the parameters behind the verdict, then further details
ParameterHemiPhysioDataGdisp
PriceFreeFree
Positive reviews100.0% of reviewsβ€”
Update frequencyEvery 18 monthsEvery 4 weeks β€” better
AdsNo β€” betterYes
In-app purchasesNoNo
MonetizationFreeβ€”
DevicesiPhone, iPod, Apple WatchiPhone, iPad, iPod
Requires iOS13.2 β€” better15.5
Further details β€” not scored
Size2 MB4 MB
Age rating4+4+
DeveloperMoez ur RehmanShuntaro Shinohara

In-app purchases

None

HemiPhysioData

No in-app purchases

None

Gdisp

No in-app purchases

Questions

Is HemiPhysioData free?
HemiPhysioData is free to download, with no in-app purchases.
Is Gdisp free?
Gdisp is free to download, with no in-app purchases.
Do HemiPhysioData or Gdisp have ads?
Gdisp shows ads; HemiPhysioData does not.
Which is updated more often, HemiPhysioData or Gdisp?
HemiPhysioData ships an update every 18 months, and Gdisp every 4 weeks. Most recently, HemiPhysioData was updated on September 29, 2026 and Gdisp on October 27, 2026.

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