This is the usual simple notepad with a wonderful feature - you can always see a place on the map, where made a note. Each note is indicated by a symbol of the Emoji character.
Activate your Emoji keyboard in the settings and add the desired images in your collection. Now, wherever you are, you can make notes and mark them with suitable picture.
With building calculator you can calculate inside application. Result will be appended to your note.
some improvements
My Kite 
Calculator & Notepad 