NEON
FERATU

measured, not vibed

The palette

Every colour is placed in OKLCH and checked at build time. Contrast is against this tube's editor background.

• neon.fangkeywords, cursor
  L · C · :1
• neon.chromefunctions, links
  L · C · :1
• neon.hextypes, classes
  L · C · :1
• neon.acidstrings
  L · C · :1
• neon.sodiumnumbers, constants
  L · C · :1
• neon.wounderrors, deletions
  L · C · :1
• fg.phosphorbody text
  L · C · :1
• fg.mutedcomments
  L · C · :1
• bg.voideditor background
  L · C · :1

five accents, and that's the budget

The hierarchy

# the ceiling on how saturated this hue gets, at this lightness
def max_chroma(L: float, H: float) -> float:
    """Walk chroma down until the color fits in sRGB."""
    lo, hi = 0.0, 0.5
    for _ in range(48):
        mid = (lo + hi) / 2
        if in_gamut(L, mid, H):
            lo = mid
        else:
            hi = mid
    return lo

• magentakeywords, the cursor, anything that moves
• cyanthings you call
• violetthings you name
• greenliteral text
• amberliteral numbers

one command each

Targets

• fontMonaspace Krypton, weight 500 in editors, bold in terminals
• claudeall 72 theme keys, spinner rainbow and diff blocks included
• vscodelocal extension, 1.55 line height, 3px phase-blinking cursor
• itermdynamic profile — iTerm2 picks it up live, no restart
• terminalinstalls the profile and makes it default
• zed~/.config/zed/themes, Cmd+K Cmd+T to pick
• sublimetmTheme, same colors
• batsyntax highlighting in your pager

python 3, no dependencies

Install