Tool name is 'two tone' is making it, you can specify the number of 3 or more shades.
B7:Coat - Reduce the brightness of the original image, apply a specific color.
Free Online Photo Editor | Photo-kako.com
This website is a free online photo editor. You can edit your pictures and apply photo effects. This photo editing software has several unique digital image processing apps. It's one of the most popular free online photo editors in Japan. You can use output images for anything.