Max Volume Booster is a full-version utility tool designed for iPhone users to enhance their audio or video volume up to 1000%. With one tap, users can boost the sound of any audio or video and experience the true sound like never before. The app also allows users to decrease or mute sounds if needed.

This app supports various audio and video formats, including MP3, FLAC, WAV, and M4A. The premium version of the app offers additional features like converting audio in different formats, trimming audio with custom sliders, and boosting music bass to the maximum. Users can also enjoy an ad-free experience and custom audio presets through the premium version.

The app offers a free trial subscription, which is automatically renewed unless canceled 24 hours before the renewal. The subscription can be managed by the user, and auto-renewal can be turned off by going to the user's Account Settings after purchase. To access all the premium features, users need to subscribe to the app.

Max Volume Booster is an excellent app for those who want to enhance their audio or video experience on their iPhone. However, users should be aware of the subscription details before purchasing the app.