DLsite Sound is an Android app developed by EISYS Inc. that allows you to browse and listen to your purchased audio with ease. The app provides an optimized listening environment, allowing you to immerse yourself deeper into the audio you love. With DLsite Sound, you no longer have to worry about failed playback when trying to play audio in the background in your browser.

DLsite Sound is a free app with no ads, in-app purchases, or user data gathering. However, it's worth noting that you cannot register as a new user via the app, so you'll need to create an account on the DLsite website first.

Overall, DLsite Sound is an excellent app for DLsite users who want a stable listening environment for their purchased audio. It's easy to use and provides a great listening experience, making it a must-have for audiophiles everywhere.