# #51518a

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

## Values

- Hex: `#51518a`
- RGB: rgb(81, 81, 138)
- HSL: hsl(240, 26%, 43%)
- OKLCH: oklch(0.462 0.092 282.2)
- Relative luminance: 0.0947
- Nearest named color: Dusk (#4e5481, Δ 1.935) — https://brandsweets.com/colors/dusk
- Moods: cool, muted
- Page: https://brandsweets.com/colors/51518a

## Tints & shades

- Tints (toward white): #5c5c9d, #6b6ba8, #7e7eb4, #8f8fbd, #a2a2c8, #b2b2d2, #c5c5dd, #d5d5e6, #e9e9f2, #f9f9fb
- Shades (toward black): #4a4a7d, #424270, #3a3a64, #333357, #2d2d4d, #262640, #1e1e33, #171727, #0f0f1a, #08080d

## Harmonies

- Complementary: #8a8a51
- Analogous: #516e8a, #6e518a
- Triadic: #8a5151, #518a51
- Split-complementary: #8a6e51, #6e8a51
- Tetradic: #8a516e, #8a8a51, #518a6e

## Colors that go with #51518a

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

- **Charcoal** #36454f [role, pool] — Charcoal is the text near-black for #51518a: softer than #000 and cool enough to feel like part of the same palette. Seen in: Harbour (https://brandsweets.com/palettes/cool#harbour), Amazon (https://brandsweets.com/colors/brands/amazon-com), Hinge (https://brandsweets.com/colors/brands/hinge-co), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com). — https://brandsweets.com/colors/charcoal
- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #51518a'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), American Express (https://brandsweets.com/colors/brands/americanexpress-com), Discover (https://brandsweets.com/colors/brands/discover-com), Auth0 (https://brandsweets.com/colors/brands/auth0-com). — https://brandsweets.com/colors/steelblue
- **Amber** #ffbf00 [pool] — Amber is paired with #51518a in 4 real palettes, including Warner Bros.'s brand system and McDonald's's brand system, as the accent. Seen in: Warner Bros. (https://brandsweets.com/colors/brands/warnerbros-com), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), Wikipedia (https://brandsweets.com/colors/brands/wikipedia-org). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 6 real palettes, including Tesco's brand system and CVS's brand system put Blue beside #51518a, as the supporting colour. Seen in: Tesco (https://brandsweets.com/colors/brands/tesco-com), CVS (https://brandsweets.com/colors/brands/cvs-com), Pixar (https://brandsweets.com/colors/brands/pixar-com), Activision (https://brandsweets.com/colors/brands/activision-com). — https://brandsweets.com/colors/blue
- **Crimson** #dc143c [pool] — Crimson is paired with #51518a in 13 real palettes, including Wells Fargo's brand system and Walgreens's brand system, as the lead colour. Seen in: Wells Fargo (https://brandsweets.com/colors/brands/wellsfargo-com), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Costco (https://brandsweets.com/colors/brands/costco-com), Netflix (https://brandsweets.com/colors/brands/netflix). — https://brandsweets.com/colors/crimson
- **Firebrick** #b22222 [pool] — Designers have shipped Firebrick with #51518a: 5 real palettes, including Campbell's's brand system and Datadog's brand system, as the supporting colour. Seen in: Campbell's (https://brandsweets.com/colors/brands/campbells-com), Datadog (https://brandsweets.com/colors/brands/datadoghq-com), AT&T (https://brandsweets.com/colors/brands/att-com), Wendy's (https://brandsweets.com/colors/brands/wendys-com). — https://brandsweets.com/colors/firebrick
- **Light Coral** #f08080 [pool] — Designers have shipped Light Coral with #51518a: 4 real palettes, including Target : Expect More. Pay Less.'s brand system and Sentry's brand system, as the supporting colour. Seen in: Target : Expect More. Pay Less. (https://brandsweets.com/colors/brands/target-com), Sentry (https://brandsweets.com/colors/brands/sentry-io), Cobalt Pop (https://brandsweets.com/palettes/bold#cobalt-pop), Blush (https://brandsweets.com/palettes/light#blush). — https://brandsweets.com/colors/lightcoral
- **Midnight Blue** #191970 [pool] — 17 real palettes, including FIFA's brand system and First Snow put Midnight Blue beside #51518a, as the lead colour. Seen in: FIFA (https://brandsweets.com/colors/brands/fifa-com), First Snow (https://brandsweets.com/palettes/cool#first-snow), Lufthansa (https://brandsweets.com/colors/brands/lufthansa-com), Open House (https://brandsweets.com/palettes/clean#open-house). — https://brandsweets.com/colors/midnightblue

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

- On white (#ffffff): 7.26:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.89:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #7272ac (4.72:1); AA: background → #cccccc (4.52:1); AAA: text → #9292bf (7.09:1); AAA: background → #fcfcfc (7.07:1)

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/51518a-a19cc4-df994e-251f2d-e9edf1?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: "#51518a" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.