The nebelung palette

nebelung is a silver-mist Catppuccin variant — the blue pulled out of the neutral ramp and the accents calmed (chroma ×0.9), keeping perceptual lightness identical. The result is a fog-grey scheme named for a cat breed the colour of high fog. Grey is the point.

The source of truth is palette/nebelung.hex.json in the nebelung repo.

The four variants

Those two rules never mention “dark”, so they work in either polarity: applied to Catppuccin Latte instead of Mocha they give the same theme as a light one. Crossed with a contrast axis, that’s four palettes — picked in the rice with theme.flavor and theme.contrast:

Variant	Source	Rendered under	text on base
`nebelung`	Mocha	(the tree root)	11.3:1
`nebelung-high-contrast`	Mocha	`high-contrast/`	19.9:1
`nebelung-latte`	Latte	`latte/`	7.0:1
`nebelung-latte-high-contrast`	Latte	`latte-high-contrast/`	9.9:1

Every variant keeps its flavor’s accents unchanged — contrast is a property of the neutrals only, so a high-contrast rice is the same theme read more easily rather than a different one. Each ratio is asserted in nebelung’s CI, and there’s a test that all twelve ramp steps stay distinct, because a boost pushed too far clamps two of them into the same colour and silently costs a level of hierarchy.

Each variant also renders as its own Catppuccin flavor, so its files are named after it — Ghostty’s light theme is latte/ghostty/themes/catppuccin-latte.conf. The swatches below are the default variant; view any of them in the interactive preview.

The neutral ramp

Twelve steps from near-black to soft white — the bones of the theme.

#d7d7d7text

#c3c3c3subtext1

#aeaeaesubtext0

#9a9a9aoverlay2

#858585overlay1

#717171overlay0

#5c5c5csurface2

#494949surface1

#343434surface0

#202020base

#191919mantle

#121212crust

The accents

Fourteen calmed accents. mauve is the family default; set another with nebelhaus.theme.accent.

#f3e1ddrosewater

#efceceflamingo

#f2c4e5pink

#c9a8f1mauve — the family default

#ed8fa9red

#e6a3admaroon

#f5b58epeach

#f7e2b5yellow

#abe1a6green

#9be0d5teal

#91dbe8sky

#7dc6e7sapphire

#8db4f3blue

#b5bff8lavender

Using it in your own tools

nebelung ships a rendered theme for 50+ tools, generated from the palette with Whiskers. A sampling:

Tool	Tool	Tool	Tool
Ghostty	Kitty	Alacritty	Starship
zellij	tmux	btop	bat
delta	fzf	lsd	yazi
lazygit	glow	helix	Zen browser
Slack	Obsidian	VS Code / Cursor	zsh-syntax-highlighting

Two ways to consume them:

Copy a rendered file. Build the flake’s output tree and grab the file for your tool — e.g. Ghostty’s theme, bat’s .tmTheme, lazygit’s per-accent .yml. Each tool’s README section shows where its config expects the file.
Consume the flake from your own Nix config:
```
inputs.nebelung.url = "github:nebelhaus/nebelung";
# rendered themes:
#   ${nebelung.packages.${system}.default}/<tool>/...
# raw palette (name → "#hex") for configs you generate yourself:
#   nebelung.palette
```

Tuning the palette

The palette is computed in OKLCH space, so you can rewrite hue and chroma while preserving perceptual lightness. Three knobs at the top of scripts/generate-palette.mjs control the look:

Knob	Meaning	Default
`neutralHue`	Hue (degrees) of the grey tint — 70° is a faint warm graphite	`70`
`neutralChroma`	Strength of that tint; `0` is pure neutral grey	`0`
`accentChromaScale`	How much accents are calmed (`0.9` = 10% less saturated)	`0.9`

Then regenerate and re-render:

./build.sh            # regenerate palette + render every tool → dist/
./build.sh --no-gen   # render only (palette unchanged)

This is a change in the nebelung repo, not your host file — see the nebelung README for the full workflow.