Sensorama

Sensorama is a straightforward iOS app that systematically collects readings from every sensor in your iPhone. It runs in the background, taking samples at regular intervals, and compiles all this data into a clean JSON file. Once the collection is complete, the app emails this file directly to you. A copy is also stored on Sensorama's servers, where it's used for research and to improve the app itself.

The tool stands out because it provides raw, unfiltered access to your device's sensor data in a developer-friendly format. Instead of just showing graphs or summaries, it gives you the actual numbers from the accelerometer, gyroscope, magnetometer, and other sensors. Everything is open source, which means you can see exactly how the data collection works and even contribute to the project.

This is primarily useful for data scientists, researchers, and developers who need real-world sensor data for their projects. You could use it to gather training data for machine learning models, conduct academic research on human movement patterns, or test how different activities affect phone sensors. It's a simple tool that solves a very specific data collection problem.