This add-on allows you to directly connect with the Pensolve server and seamlessly process files to hand-written calculations as well as markup cells based on their usage. The improved connectivity compared to using Pensolve's standalone web-app means that users learn faster and can find calculation issues easier. Conversion to PDF: reads through all the calculations in the spreadsheet and writes them out as hand-written calculations in a PDF document, showing the algebraic, numerical formulas as well as the answer, units, comments and references. Assess: A fast evaluation of the spreadsheet to allow the user to markup cells, formulas and view equation dependencies. Markup: This button changes the cell and font color based on how the cells are used (e.g. input cells = yellow, calculations = blue, units = gray text, references = brown text). View formula: The user can view the cell algebraic formula quickly from within the sidebar. View dependents: This button shows all of the cells that you the current cell as an input.