Stud Finder: Wall Detector is a free utility and tools application available for iPhone. Developed by Francisco Antonelli, this app aims to help users detect studs by utilizing the magnetometer in their iPhone.

To use the app, simply place your iPhone near any metal objects and the app will measure the magnetic field to detect studs. It is recommended to remove any external case from your device before using the app for accurate readings.

The app provides a simple and straightforward way to check if it works. By holding the phone close to a stainless steel knife, users can observe the indicator changing, indicating the app's ability to detect metal objects.

Stud Finder: Wall Detector offers several features to enhance the user experience. Users can calibrate the sensor when the readings are invalid, ensuring accurate results. Additionally, the sensitivity can be adjusted to detect low or high variations in the magnetic field. The hold button allows users to hold the read value until they press it again, providing convenience during the detection process.