Terminal UI Design

Terminal UI Design

Create distinctive, production-grade terminal user interfaces with high design quality. Use this skill when building CLI tools, TUI applications, or terminal-based interfaces. Generate creative, polished code that avoids generic terminal aesthetics.

Design Thinking

Before coding, understand the context and commit to a BOLD aesthetic direction:

1. Purpose: What problem does this interface solve? Who uses it? What's the workflow?
2. Tone: Pick an extreme: hacker/cyberpunk, retro-computing (80s/90s), minimalist zen, maximalist dashboard, synthwave neon, monochrome brutalist, corporate mainframe, playful/whimsical, matrix-style, steampunk terminal, vaporwave, military/tactical, art deco, paper-tape nostalgic
3. Constraints: Technical requirements (Python Rich, Go bubbletea, Rust ratatui, Node.js blessed/ink, pure ANSI escape codes, ncurses)
4. Differentiation: What makes this UNFORGETTABLE? What's the one thing someone will remember about this terminal experience?

Choose a clear conceptual direction and execute it with precision. A dense information dashboard and a zen single-focus interface both work—the key is intentionality, not intensity.

Box Drawing & Borders

Choose border styles that match your aesthetic:

• Single line: ┌─┐│└┘ — Clean, modern
• Double line: ╔═╗║╚╝ — Bold, formal, retro-mainframe
• Rounded: ╭─╮│╰╯ — Soft, friendly, modern
• Heavy: ┏━┓┃┗┛ — Strong, industrial
• Dashed/Dotted: ┄┆ — Light, airy, informal
• ASCII only: +-+| — Retro, universal compatibility
• Block characters: █▀▄▌▐ — Chunky, bold, brutalist
• Custom Unicode: Mix symbols like ◢◣◤◥, ●○◐◑, ▲▼◀▶ for unique frames

Avoid defaulting to simple single-line boxes. Consider asymmetric borders, double-thick headers, or decorative corners like ◆, ◈, ✦, ⬡.

Color & Theme

Commit to a cohesive palette. Terminal color strategies:

• ANSI 16: Classic, universal. Craft distinctive combinations beyond default red/green/blue
• 256-color: Rich palettes. Use color gradients, subtle background variations
• True color (24-bit): Full spectrum. Gradient text, smooth color transitions
• Monochrome: Single color with intensity variations (dim, normal, bold, reverse). Elegant constraint

Create atmosphere with:

• Background color blocks for sections
• Gradient fills using block characters ░▒▓█
• Color-coded semantic meaning (but avoid cliché red=bad, green=good)
• Inverted/reverse video for emphasis
• Dim text for secondary information, bold for primary

Palette examples (invent your own):

• Cyberpunk: Hot pink #ff00ff, electric cyan #00ffff, deep purple #1a0a2e background
• Amber terminal: #ffb000 on black, like vintage CRTs
• Nord-inspired: Cool blues and muted greens on dark blue-gray
• Hot Dog Stand: Intentionally garish yellow/red (for playful/ironic UIs)

Typography & Text Styling

The terminal is ALL typography. Make it count:

• ASCII art headers: Use figlet-style banners, custom letterforms, or Unicode art
• Text weight: Bold, dim, normal — create visual hierarchy
• Text decoration: Underline, strikethrough, italic (where supported)
• Letter spacing: Simulate with spaces for headers: H E A D E R
• Case: ALL CAPS for headers, lowercase for body, mixed for emphasis
• Unicode symbols: Enrich text with → • ◆ ★ ⚡ λ ∴ ≡ ⌘
• Custom bullets: Replace - with ▸ ◉ ✓ ⬢ › or themed symbols

ASCII Art Styles:

Block:    ███████╗██╗██╗     ███████╗
Slant:    /___  / / // /     / ____/
Small:    ╔═╗┌─┐┌─┐
Minimal:  [ HEADER ]

Layout & Spatial Composition

Break free from single-column output:

• Panels & Windows: Create distinct regions with borders
• Columns: Side-by-side information using careful spacing
• Tables: Align data meaningfully, use Unicode table characters
• Whitespace: Generous padding inside panels, breathing room between sections
• Density: Match to purpose — dashboards can be dense, wizards should be sparse
• Hierarchy: Clear visual distinction between primary content, secondary info, and chrome
• Asymmetry: Off-center titles, weighted layouts, unexpected alignments

Motion & Animation

Terminals support dynamic content:

• Spinners: Beyond basic |/-. Use Braille patterns ⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏, dots ⣾⣽⣻⢿⡿⣟⣯⣷, custom sequences
• Progress bars: ▓░, █▒, [=====> ], or creative alternatives like ◐◓◑◒
• Typing effects: Reveal text character-by-character for drama
• Transitions: Wipe effects, fade in/out with color intensity
• Live updates: Streaming data, real-time charts

Data Display

• Sparklines: ▁▂▃▄▅▆▇█ for inline mini-charts
• Bar charts: Horizontal bars with block characters
• Tables: Smart column sizing, alternating row colors, aligned numbers
• Trees: ├── └── │ for hierarchies
• Status indicators: ● green, ○ empty, ◐ partial, ✓ complete, ✗ failed
• Gauges: [████████░░] with percentage

Decorative Elements

Add character without clutter:

• Dividers: ───── ═════ •••••• ░░░░░░ ≋≋≋≋≋≋
• Section markers: ▶ SECTION, [ SECTION ], ─── SECTION ───, ◆ SECTION
• Background textures: Patterns using light characters like · ∙ ░
• Icons: Nerd Font icons if available: 󰊢 󰂽 󰃻 󰃽 󰮍 󰈔

Anti-Patterns to Avoid

NEVER use generic terminal aesthetics like:

• Plain unformatted text output
• Default colors without intentional palette
• Basic [INFO], [ERROR] prefixes without styling
• Simple ---- dividers
• Walls of unstructured text
• Generic progress bars without personality
• Boring help text formatting
• Inconsistent spacing and alignment

Library Quick Reference

Python: Rich, Textual Go: Bubbletea, Lipgloss Rust: Ratatui Node.js: Ink, Blessed

ANSI Escape Codes:

\x1b[1m       Bold
\x1b[3m       Italic
\x1b[4m       Underline
\x1b[31m      Red foreground
\x1b[38;2;R;G;Bm  True color
\x1b[2J       Clear screen

The terminal is a canvas with unique constraints and possibilities. Don't just print text—craft an experience.

Match implementation complexity to the aesthetic vision. A dense monitoring dashboard needs elaborate panels and live updates. A minimal CLI needs restraint, precision, and perfect alignment. Elegance comes from executing the vision well.