Here it is, the Gann Square of 9. An easy-to-use tool to determine possible support and resistance levels. Input a starting value to be the starting point of the square. Then the increasing value will be used to get the value of each cell on the table.
It's possible to show the diagonals and a spot number to see what cell value the current price is close to. The diagonals are known to be the key support and resistance levels in Gann's analysis. That way, it's possible to show those diagonals in the chart for easy reading of those levels.