Cameleon

Cameleon is a Safari extension for the Mac that recolours any website to one of five skins. Three are dark, for reading a bright site at night. Two are light, which a dark mode cannot do: a site that is already dark, turned to warm paper or to sage and navy. It changes colour only: no layout changes, and photographs are left as they are. Every colour it sets is re-lit until it reads at least 4.5:1 against the furthest surface in the skin, and a skin chosen for a site is remembered for that site. The extension has no networking code: no account, no analytics, no adverts. $3.99 once after a seven-day free trial. macOS 13 or later.