# #42657b

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

## Values

- Hex: `#42657b`
- RGB: rgb(66, 101, 123)
- HSL: hsl(203, 30%, 37%)
- OKLCH: oklch(0.489 0.054 237)
- Relative luminance: 0.119
- Nearest named color: Admiral Blue (#50647f, Δ 1.949) — https://brandsweets.com/colors/admiral-blue
- Moods: cool, muted
- Page: https://brandsweets.com/colors/42657b

## Tints & shades

- Tints (toward white): #4d758f, #5786a2, #6a94af, #7ea3b9, #95b3c6, #a9c1d1, #bdd0db, #d1dee6, #e4ecf1, #f8fafb
- Shades (toward black): #3d5d71, #365263, #304a5a, #2b4150, #253946, #1e2e38, #19262e, #141e24, #0c1317, #070b0d

## Harmonies

- Complementary: #7b5842
- Analogous: #427b74, #42497b
- Triadic: #7b4265, #657b42
- Split-complementary: #7b4249, #7b7442
- Tetradic: #74427b, #7b5842, #497b42

## Colors that go with #42657b

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 #42657b: softer than #000 and cool enough to feel like part of the same palette. Seen in: Harbour (https://brandsweets.com/palettes/cool#harbour), Pampers (https://brandsweets.com/colors/brands/pampers-com), Gusto (https://brandsweets.com/colors/brands/gusto-com), Campus (https://brandsweets.com/palettes/friendly#campus). — https://brandsweets.com/colors/charcoal
- **Sienna** #a0522d [harmony, pool: complementary] — Sienna sits directly opposite #42657b on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: BrandSweets (https://brandsweets.com/colors/brands/brandsweets). — https://brandsweets.com/colors/sienna
- **Amber** #ffbf00 [pool] — Amber is paired with #42657b in 5 real palettes, including Lemon Squeezy's brand system and McDonald's's brand system, as the lead colour. Seen in: Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Wired (https://brandsweets.com/colors/brands/wired-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 5 real palettes, including Activision's brand system and Tesco's brand system put Blue beside #42657b, as the accent. Seen in: Activision (https://brandsweets.com/colors/brands/activision-com), Tesco (https://brandsweets.com/colors/brands/tesco-com), Warp (https://brandsweets.com/colors/brands/warp-dev), CVS (https://brandsweets.com/colors/brands/cvs-com). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #42657b: 6 real palettes, including Fintech Trust and Ink & Paper, as the lead colour. Seen in: Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Ink & Paper (https://brandsweets.com/palettes/minimal#ink-and-paper), Glacier (https://brandsweets.com/palettes/cool#glacier), Hershey's (https://brandsweets.com/colors/brands/hersheys-com). — https://brandsweets.com/colors/cobalt
- **Copper** #b87333 [pool] — Designers have shipped Copper with #42657b: 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), Riverbed (https://brandsweets.com/palettes/muted#riverbed), Clay & Linen (https://brandsweets.com/palettes/warm#clay-and-linen). — https://brandsweets.com/colors/copper
- **Crimson** #dc143c [pool] — Crimson is paired with #42657b in 16 real palettes, including Gemstone and Wendy's's brand system, as the accent. Seen in: Gemstone (https://brandsweets.com/palettes/vivid#gemstone), Wendy's (https://brandsweets.com/colors/brands/wendys-com), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com). — https://brandsweets.com/colors/crimson
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #42657b: 5 real palettes, including Deep Water and Venmo's brand system, as the lead colour. Seen in: Deep Water (https://brandsweets.com/palettes/dark#deep-water), Venmo (https://brandsweets.com/colors/brands/venmo-com), Warp (https://brandsweets.com/colors/brands/warp-dev), Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com). — https://brandsweets.com/colors/deepskyblue

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

- On white (#ffffff): 6.21:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #3b5a6d (7.32:1)
- On black (#000000): 3.38:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #507b95 (4.61:1); AA: background → #dedede (4.62:1); AAA: text → #749bb4 (7.09:1)

## Brands using this color

- **Stripe** — secondary #50617a (Δ 1.974) — https://brandsweets.com/colors/brands/stripe

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/42657b-9cb0c4-df4e5d-1f222d-e9f1f0?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: "#42657b" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.