Based on DuoTone themes by Simurai for Atom.
“DuoTone themes use only 2 hues (7 shades in total). It tones down less important parts (like punctuation and brackets) and highlights only the important ones. This leads to a more calm color scheme, but still lets you find the stuff you’re looking for.”
Base2Tone has it’s own dedicated repository, and demopage on base2t.one where one can find links to dedicated repositories for generating syntax-highlighting themes for specific applications, like VS Code, Vim, iTerm2, HyperTerm and Prism.