NoteMath18

Features:

• Type = after an expression and the result shows up right away. Press space or return to accept it (1+1=2).
• Results update live when you edit the expression, and also on undo/redo.
• Variables support: a = 1, b = 3, then 3a + 2b = 9 further down the note.
• iOS 18 style colours: correct results turn yellow, invalid expressions get a red mark.
• Tap a result to copy or cut it (iOS 16+).