I wish there would be a color blind friendly version of this. I have deuteranopia and can’t distinguish red from green in the page.
https://www.vischeck.com/run.html
https://www.vischeck.com/run.html
It twiddles colors in a physiologically-aware manner to improve legibility for colorblind observers:
https://github.com/wadelab/VischeckTinyeyes/blob/main/websit...
https://github.com/wadelab/VischeckTinyeyes
Enjoy!