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Library

Letter. Private gallery with iridescent vault artifacts.

  • Finance
  • Mixed theme
  • 13 colors
  • 2 typefaces

Letter is a private-banking platform that reads like a gallery exhibition for high-net-worth finance. The visual system pivots between a deep ink-black hero stage and a bright editorial body, with 3D metallic and prismatic renders as the recurring sculptural accent. Typography is split into two deliberate registers: a wide grotesque for interface text and navigation, and a high-contrast serif at 80px for headlines that read like magazine cover titles. Color is used as architectural punctuation — three near-gray tinted panels (peach, mint, lavender) act as gallery walls, while teal, violet, and blue claim the action buttons as discrete brand moments. Components are square and confident: 2px corner radii, generous horizontal button padding, and zero decorative shadow — the renders and typography do all the emotional work.

Screenshot of Letter
Captured from letter.co on October 11, 2026

Letter design system

Letter

Brand4

  • Teal action color for filled buttons, selected navigation states, and focused conversion moments.

  • Violet action color for filled buttons, selected navigation states, and focused conversion moments.

  • Secondary action buttons, hover state on violet CTAs, accent borders — deeper companion to Electric Violet for depth

  • Blue action color for filled buttons, selected navigation states, and focused conversion moments.

Accent3

  • Hairline borders, dividers, input outlines, and card edges on light surfaces.

  • Tinted card background — cool mint gallery wall, likely the investing/savings panel

  • Tinted card background — soft lavender gallery wall for the credit or lending panel

Neutrals6

  • Primary text, headline ink, logo mark — the only true black in the system, reserved for maximum-contrast typography

  • Hero background, dark surface stage, dark card panel — deep near-black with the faintest blue chill, warmer than pure black but harder than charcoal

  • Muted helper text, secondary metadata, low-emphasis labels — a true middle gray with no chromatic bias

  • Borders, dividers, card outlines, button strokes at low contrast — barely-there separators that define structure without drawing the eye

  • Soft section background, subtle card surface, secondary canvas — sits one step below pure white without grayness

  • Page canvas, light card surface, inverse text on dark backgrounds, outlined button fills

Try a pairing

Pick any two colors from the palette to check whether text stays readable on top.

Aa

Paper White on Deep Teal

6.01 : 1 contrast

Background
Text
  • Body textPasses AA 4.5
  • Large textPasses AA 3
  • StrictFails AAA 7

More DESIGN.md files. Same web, different personalities.