volca is a free volume control application developed by Wisteria Stone Soft for Android devices. This app allows you to control the volume settings quickly and easily in three different ways.

Firstly, you can control the volume from the app itself. This is a convenient feature for those who prefer to have more control over their device's volume settings.

Secondly, the app also provides a notification feature that allows you to control the volume from the notification panel. You can switch the mute state and change the volume at any time, making it easy to adjust the volume on-the-go.

Lastly, by registering the volca tile in the quick settings tile, you can switch the mute state from the tile. This feature is available for Android 7.0 or later versions.

Overall, volca is a useful app for anyone who wants to have more control over their device's volume settings. It works on Android 5.0 or later and has been tested on the latest Android version, so users can use it with confidence.