Caligo

50 perceptually uniform dark themes built on OKLCH color science
10 seed palettes × 5 harmony modes

Install · Live Preview · Gallery · Contribute · Quick Start

What is Caligo?

Caligo is a professional dark theme collection for Visual Studio Code, built on color science principles. Unlike traditional hand-picked color schemes, Caligo uses OKLCH — a perceptually uniform color space — to generate mathematically harmonious themes that are easy on the eyes and maintain consistent readability.

Choose from 50 carefully crafted themes: 10 distinctive seed palettes × 5 color harmony variants.

Why Caligo?

🔬 OKLCH Color Science

Traditional themes rely on trial-and-error hex codes. Caligo leverages OKLCH for predictable, perceptually uniform colors:

• Consistent brightness — Colors at equal lightness values look equally bright
• Preserved readability — Harmony transformations maintain contrast ratios
• Mathematical precision — "Colors that look equally different, are equally different"

✨ Key Features

• 50 themes from 10 seed palettes × 5 color harmonies
• High contrast — designed with accessibility in mind using APCA-W3 contrast validation
• Semantic highlighting — intent-aware colors for declarations, mutations, control flow
• Consistent syntax — harmonized bracket pairs, git diff, and terminal colors
• Zero configuration — works beautifully out of the box

🎯 Semantic Highlighting

Beyond basic syntax colors, Caligo provides intent-based highlighting:

Requires language server support (TypeScript, Python/Pylance, Rust, etc.)

📦 Installation

1. Open Extensions (Cmd+Shift+X / Ctrl+Shift+X)
2. Search for "Caligo"
3. Click Install
4. Open Command Palette → Preferences: Color Theme → Select any Caligo theme

Or from command line:

code --install-extension AnselmHahn.caligo-vscode-theme

🖼️ Theme Gallery

Aurora Noir

Eclipse

Mandarian

→ Browse all 50 themes

Seed Palettes

Each palette is designed to evoke a distinct visual character and mood:

Each palette has 5 harmony variants: Balanced, Analogous, Triadic, Split-Complementary, Monochromatic

📚 More Info

• Web Gallery — Interactive theme browser
• Contributing — Development setup & guidelines
• Quick Start — Developer quick start guide