# #555d72

A color — cool, muted. Deterministic analysis from BrandSweets (no inference).

## Values

- Hex: `#555d72`
- RGB: rgb(85, 93, 114)
- HSL: hsl(223, 15%, 39%)
- OKLCH: oklch(0.479 0.035 268.7)
- Relative luminance: 0.1097
- Nearest named color: Concrete Landscape (#5c606e, Δ 1.686) — https://brandsweets.com/colors/concrete-landscape
- Moods: cool, muted
- Page: https://brandsweets.com/colors/555d72

## Tints & shades

- Tints (toward white): #626b84, #6f7a95, #818aa2, #929baf, #a4abbc, #b3b8c7, #c4c9d4, #d6d9e1, #e8e9ee, #f9fafb
- Shades (toward black): #4e566a, #454c5e, #3f4555, #363c49, #303441, #272b35, #21242c, #181a20, #111317, #090a0c

## Harmonies

- Complementary: #726a55
- Analogous: #556c72, #5b5572
- Triadic: #72555d, #5d7255
- Split-complementary: #725b55, #6c7255
- Tetradic: #72556c, #726a55, #55725b

## Colors that go with #555d72

Named partners (harmony on the OKLCH wheel, co-occurrence in curated palettes and brand systems, and the neutrals that carry it), best first:

- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #555d72's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Capital One (https://brandsweets.com/colors/brands/capitalone-com), Discover (https://brandsweets.com/colors/brands/discover-com), Auth0 (https://brandsweets.com/colors/brands/auth0-com), American Express (https://brandsweets.com/colors/brands/americanexpress-com). — https://brandsweets.com/colors/steelblue
- **Blue** #0000ff [pool] — 4 real palettes, including Activision's brand system and Warp's brand system put Blue beside #555d72, as the accent. Seen in: Activision (https://brandsweets.com/colors/brands/activision-com), Warp (https://brandsweets.com/colors/brands/warp-dev), Tesco (https://brandsweets.com/colors/brands/tesco-com), CVS (https://brandsweets.com/colors/brands/cvs-com). — https://brandsweets.com/colors/blue
- **Champagne** #f7e7ce [pool] — 4 real palettes, including Darkroom and BrandSweets's brand system put Champagne beside #555d72, as the surface under it. Seen in: Darkroom (https://brandsweets.com/palettes/muted#darkroom), BrandSweets (https://brandsweets.com/colors/brands/brandsweets), Coffee Bar (https://brandsweets.com/palettes/dark#coffee-bar), Forest Floor (https://brandsweets.com/palettes/dark#forest-floor). — https://brandsweets.com/colors/champagne
- **Copper** #b87333 [pool] — Designers have shipped Copper with #555d72: 4 real palettes, including Dusk and Desert Road, as the accent. Seen in: Dusk (https://brandsweets.com/palettes/cool#dusk), Desert Road (https://brandsweets.com/palettes/warm#desert-road), Clay & Linen (https://brandsweets.com/palettes/warm#clay-and-linen), Riverbed (https://brandsweets.com/palettes/muted#riverbed). — https://brandsweets.com/colors/copper
- **Crimson** #dc143c [pool] — Crimson is paired with #555d72 in 9 real palettes, including Codecademy's brand system and Gemstone, as the accent. Seen in: Codecademy (https://brandsweets.com/colors/brands/codecademy-com), Gemstone (https://brandsweets.com/palettes/vivid#gemstone), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), Wendy's (https://brandsweets.com/colors/brands/wendys-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #555d72: 13 real palettes, including HP's brand system and The New York Times's brand system, as the accent. Seen in: HP (https://brandsweets.com/colors/brands/hp-com), The New York Times (https://brandsweets.com/colors/brands/nytimes-com), Campus (https://brandsweets.com/palettes/friendly#campus), Dutch Bros (https://brandsweets.com/colors/brands/dutchbros-com). — https://brandsweets.com/colors/denim
- **Firebrick** #b22222 [pool] — Designers have shipped Firebrick with #555d72: 4 real palettes, including Fireside and Newsprint, as the lead colour. Seen in: Fireside (https://brandsweets.com/palettes/dark#fireside), Newsprint (https://brandsweets.com/palettes/editorial#newsprint), Wendy's (https://brandsweets.com/colors/brands/wendys-com), AT&T (https://brandsweets.com/colors/brands/att-com). — https://brandsweets.com/colors/firebrick
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #555d72: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy. — https://brandsweets.com/colors/whitesmoke

## Contrast (WCAG 2.x, as text)

- On white (#ffffff): 6.57:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #50586d (7.1:1)
- On black (#000000): 3.19:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #6a7590 (4.56:1); AA: background → #d6d6d6 (4.52:1); AAA: text → #8d95aa (7.01:1)

## Brands using this color

- **Stripe** — secondary #50617a (Δ 1.544) — https://brandsweets.com/colors/brands/stripe
- **Lufthansa** — secondary #52627c (Δ 1.852) — https://brandsweets.com/colors/brands/lufthansa-com
- **GitHub** — textMuted #57606a (Δ 1.853) — https://brandsweets.com/colors/brands/github

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/555d72-9ca3c4-df704e-211f2d-e9eff1?lock=0&style=vibrant
(Humans lock/regenerate in the tool; the URL is the state — read `lock=` back to see what they kept.)

## Connect an agent

Point any MCP client at the BrandSweets colors endpoint for the same engine:

- Endpoint: https://mcp.brandsweets.com/colors/mcp
- Tools: `analyze_color` (e.g. `analyze_color({ color: "#555d72" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.