Skritter has really helped me improve my tones (which used to be good, but are now pretty approximate, i.e. my speaking is fine, but it's difficult for me to guess the tone) and I really like the idea of showing the four color tones for the characters after writing them; however, it is so small on the side that it is not as helpful as it could be. One possibility would be to write in that color when the tone is not requested (to reinforce tone identification) or showing characters in different colors in vocabulary lists. I'm not sure whether there are others with additional suggestions on how to integrate color into practice, but I hope that you guys can continue to improve this feature. Thanks!