Comparison

SensorLog vs IMU Step

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

IMU Step

This app helps injured athletes return to play by analyzing their movement with waterproof sensors. It provides precise load metrics and identifies asymmetries in lower limbs, offering actionable insights through cloud-based dashboards. Monitor live data, record video, and download sensor data for detailed analysis.

Highlights
  • Real-time load metric analysis
  • Lower limb asymmetry identification
  • Cloud-based dashboard insights
  • Live data streaming
  • Session video recording
  • Sensor data download
Read full description

IMU Step removes the guesswork from an injured athlete’s Return-to-Play journey. Small, synchronized, high-frequency waterproof sensors are placed on the interior of the left and right ankles delivering load metrics to running sports athletes. It enables precise, actionable insights, identifying and quantifying the impact of each step, helping monitor and identify asymmetries of the lower limbs via cloud based dashboards. With IMU Step iOS, you can select the athlete who is training, add contextual information on their session, and view live data on an Apple device streamed directly from the sensors. Live metrics such as intensity are calculated and displayed in real-time, alongside the ability to record and save video footage of your session. You can also download data recorded by the sensors using IMU Step Desktop for PC and Mac for analysis via the IMU Step online dashboard. IMU Step iOS is only compatible with IMeasureU’s BlueTrident Inertial Sensors running firmware 10.0.1 and above.

Screenshots

SensorLog4 screens
IMU Step4 screens

Verdict

The call

The clearest difference is price: IMU Step at Free against SensorLog's $2.99. IMU Step also leads on rating (5.0 vs 4.4) and in-app purchases (none vs 4). SensorLog's advantage is update cadence (every 2 months vs every 8 months) and ratings volume (40 vs 3). On ads 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

CostPrice · In-app purchases · Ads · Monetization

IMU Step is free to download; SensorLog costs $2.99 up front. SensorLog sells 4 one-off in-app purchases. IMU Step asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

IMU Step holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: SensorLog has 40 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

SensorLog ships an update every 2 months, IMU Step every 8 months. The most recent releases landed on September 30, 2026 and June 1, 2026 respectively.

Scorecard7 real differences · 3 level
SensorLog versus IMU Step: the parameters behind the verdict, then further details
ParameterSensorLogIMU Step
Price$2.99Free — better
Rating4.4 (40 ratings)5.0 (3 ratings) — better
Positive reviews69.0% of reviews—
Number of ratings40 — better3
Update frequencyEvery 2 months — betterEvery 8 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS18.014.0 — better
Further details — not scored
Size4 MB31 MB
Age rating4+4+
DeveloperBernd ThomasI Measure U

Customer experience

SensorLog

All ratings40 ratings
Positive82.5%
Neutral2.5%
Negative15.0%
Written reviews126 reviews
Positive69.0%
Neutral7.9%
Negative23.0%

IMU Step

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

SensorLog

One-time4
  • Buy me a Coffee ...$0.99
  • Spend me an Ice Cream ...$1.99
  • Offer me a glas of Wine ...$5.99
Show 1 more
  • Invite me for a Cocktail ...$9.99
None

IMU Step

No in-app purchases

Questions

Is SensorLog free?
SensorLog costs $2.99, and also offers in-app purchases.
Is IMU Step free?
IMU Step is free to download, with no in-app purchases.
Which has better reviews, SensorLog or IMU Step?
IMU Step is rated higher. SensorLog averages 4.4 out of 5 from 40 ratings, while IMU Step averages 5.0 from 3 ratings.
Do SensorLog or IMU Step have ads?
Neither SensorLog nor IMU Step shows ads.
Which is updated more often, SensorLog or IMU Step?
SensorLog ships an update every 2 months, and IMU Step every 8 months. Most recently, SensorLog was updated on September 30, 2026 and IMU Step on June 1, 2026.

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