A free app for Android, by Codemori.
CalcX is a free-form calculator app with an intelligent calculator and formula editor.
The main function of CalcX is to calculate and edit formulas. You can edit formulas by adding, deleting, or changing the order of the elements. You can use the app to calculate a variety of mathematical functions, such as sine, cosine, and tangent. The app is also capable of solving algebraic equations.
It is integrated with Google Drive and Dropbox. In addition, you can use CalcX as a database. You can add, edit, and share the data with other users. It is designed to be used by both individuals and groups.