Audio Earbud Test Equalizer is a free Android app developed by RP Developers that tests the sound quality of earbuds or headphones and their working condition. It offers a wide range of tests to check the quality of earbuds and headphones while listening to different frequency sounds. The app includes various frequency tests such as high-frequency, low-frequency, stereo frequency, golden frequency, and binaural frequency tests.

The Left/Right Earbuds Test feature allows users to test the left and right speaker individually, check if wired headphones are connected properly, detect the microphone's functionality, and test the volume buttons and call pick-up buttons. Additionally, the app also includes an audio equalizer that enhances the sound quality by providing five bands equalizer or virtualize, bass boost effect, volume boost effect, and 3D sound effect. Users can adjust sound effect levels to listen to sound in the best possible quality.