Sound Meter is a free Android application developed by Chien-Ming Chen. It falls under the category of Utilities & Tools and is compatible with Android 9.0. This program is designed to measure noise volume in decibels (dB) using the device's microphone and display the results in real-time.

One of the best features of Sound Meter is its ability to display the voice wave and sound level using a graphical representation. This makes it easy for users to understand the noise level in their surroundings. Additionally, the application allows users to take screenshots of the results and upload them to Dropbox, email, and other applications. The app is user-friendly and easy to navigate, making it an ideal tool for anyone who needs to measure noise levels. Best of all, it is completely free to use.