#727272 on a background of #FFFFFF is a contrast ratio of 4.81:1 and fail WCAG AAA which requires a ratio of 7:1 for normal text.

That being said, it passes WCAG AA which requires 4.5:1 for normal text.

Same here, hard to read so I won’t try. Why do people use light gray on white? If you want people to read what you write, make it easy.

Reiterating: http://contrastrebellion.com/