Comparison

SensorLog vs Schulferienklar

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

Schulferienklar

Features
Read full description

Plan school holidays in Germany clearly and quickly with Schulferienklar. • View school holidays for all 16 federal states in a clear monthly calendar • Compare two federal states directly • See statewide and regional public holidays • Browse school holiday dates by year • Check current and upcoming holidays at a glance • Add the Home Screen widget for quick access • Use the app in German or English Schulferienklar is designed for families, parents, students, teachers, and anyone planning around school holidays in Germany. Holiday dates are based on officially published information. If future school holiday dates for a federal state have not yet been fully published, the app shows this transparently.

Screenshots

SensorLog4 screens
Schulferienklar4 screens

Verdict

The call

The clearest difference is price: Schulferienklar at Free against SensorLog's $2.99. Schulferienklar also leads on in-app purchases (none vs 4) and update cadence (every 4 days vs every 2 months). On ads, device support 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

SensorLog ships an update every 2 months, Schulferienklar every 4 days. The most recent releases landed on November 10, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
SensorLog versus Schulferienklar: the parameters behind the verdict, then further details
ParameterSensorLogSchulferienklar
Price$2.99Free — better
Rating4.4 (41 ratings) — better—
Positive reviews69.0% of reviews—
Number of ratings41 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, Mac
Requires iOS18.017.0 — better
Further details — not scored
Size4 MB5 MB
Age rating4+4+
DeveloperBernd ThomasSoojin Lee

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

Schulferienklar

No in-app purchases

Questions

Is SensorLog free?
SensorLog costs $2.99, and also offers in-app purchases.
Is Schulferienklar free?
Schulferienklar is free to download, with no in-app purchases.
Do SensorLog or Schulferienklar have ads?
Neither SensorLog nor Schulferienklar shows ads.
Which is updated more often, SensorLog or Schulferienklar?
SensorLog ships an update every 2 months, and Schulferienklar every 4 days. Most recently, SensorLog was updated on November 10, 2026 and Schulferienklar on October 31, 2026.

Other comparisons