Spektr

A terminal-based 16 million color picker built with Rust. Navigate a full HSL palette grid, adjust lightness, and see hex, RGBA, and OKLCH values in real time.

Features

• Full HSL color palette with half-block rendering for double vertical resolution
• Lightness slider with live gradient preview
• Color info panel showing hex, RGB, RGBA, and OKLCH values
• Cursor with automatic contrast (white on dark, black on light)
• Vim-style navigation (hjkl) alongside arrow keys

Requirements

• Rust 1.85+
• A true-color terminal (iTerm2, Kitty, Alacritty, WezTerm, Ghostty)

Usage

cargo run

Controls

Key	Action
← ↓ ↑ → / h j k l	Move cursor on palette
Tab	Toggle focus between palette and lightness slider
← → (slider focused)	Adjust lightness ±0.01
Shift+← Shift+→	Adjust lightness ±0.05
Shift+arrow (palette focused)	Move cursor by 5
q / Esc	Quit

Layout

┌──────────────────────────────────────────────────┐
│              Color Palette Grid                  │
│         X = Hue (0–360°), Y = Sat (1→0)         │
│         Half-block (▀) rendering                 │
│         Cursor with contrast marker              │
├──────────────────────────────────────────────────┤
│ Lightness: [gradient bar ▏ indicator]       0.50 │
├──────────────────────────────────────────────────┤
│ ████  #FF6B2B                                    │
│ RGB: 255, 107, 43    RGBA: 255, 107, 43, 255    │
│ OKLCH: L=0.652  C=0.198  h=46.3°                │
└──────────────────────────────────────────────────┘

License

MIT