Seismometer is a free utility and tool app developed by KHTSXR for Android 13.0 and above. It is an earthquake detector and seismograph machine app that calculates the approximate Richter magnitude scale. The app estimates object vibration using the phone's acceleration sensor.

It should be noted that the accuracy of the readings may vary depending on the phone's sensor quality and hardware used by the manufacturer. Some phones may give inaccurate results due to having a bad or error sensor. Despite this, Seismometer is a useful tool for those who want to monitor seismic activity and estimate vibration levels using their phone.

Overall, Seismometer is a straightforward and easy-to-use app that offers valuable information for those interested in earthquakes and seismic activity.