Volume Calculator: Ayatan is a free Android application developed by WeShal in the category of Business & Productivity. The app allows users to calculate the volume of any shape of tank or vessel by simply selecting the shape and inputting the dimensions. It also has the unique feature of allowing users to save calculations and maintain a history of them. The volume can be viewed in various units such as cubic millimeter, cubic centimeter, cubic inch, cubic foot, cubic meter, and brass.

In addition to these features, Volume Calculator: Ayatan also allows users to set default volume units and dimensions from the settings page. The app works offline and has a small APK size. It doesn't have any background processes and can calculate the volume of a dump truck, cube, cylinder, and other shapes. However, it should be noted that the app is intended for reference use only.

Overall, Volume Calculator: Ayatan is a useful app for anyone who needs to calculate the volume of tanks or vessels. Its unique features such as saving calculations and maintaining a history of them make it stand out from other similar apps on the market. The ability to set default volume units and dimensions is also a handy feature.