# #42858f

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

## Values

- Hex: `#42858f`
- RGB: rgb(66, 133, 143)
- HSL: hsl(188, 37%, 41%)
- OKLCH: oklch(0.577 0.069 208.2)
- Relative luminance: 0.1992
- Nearest named color: darkcyan (#008b8b, Δ 3.48) — https://brandsweets.com/colors/darkcyan
- Moods: cool, modern
- Page: https://brandsweets.com/colors/42858f

## Tints & shades

- Tints (toward white): #4c98a4, #57a6b2, #6cb1bc, #81bcc5, #96c7cf, #a8d1d7, #bddce0, #d2e7ea, #e3f0f2, #f8fbfc
- Shades (toward black): #3b7881, #376e77, #306169, #2a545b, #254b50, #1f3e42, #183134, #122426, #0d1a1c, #060d0e

## Harmonies

- Complementary: #8f4c42
- Analogous: #428f73, #425e8f
- Triadic: #8f4285, #858f42
- Split-complementary: #8f425e, #8f7342
- Tetradic: #73428f, #8f4c42, #5e8f42

## Colors that go with #42858f

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 #42858f: softer than #000 and cool enough to feel like part of the same palette. Seen in: Beach Hut (https://brandsweets.com/palettes/light#beach-hut), N26 (https://brandsweets.com/colors/brands/n26-com), Auth0 (https://brandsweets.com/colors/brands/auth0-com), Campus (https://brandsweets.com/palettes/friendly#campus). — https://brandsweets.com/colors/charcoal
- **Copper** #b87333 [harmony, pool: split] — Copper is a split-complement of #42858f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Riverbed (https://brandsweets.com/palettes/muted#riverbed), Wellness (https://brandsweets.com/palettes/warm#wellness), Atelier (https://brandsweets.com/palettes/elegant#atelier), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty). — https://brandsweets.com/colors/copper
- **Amber** #ffbf00 [pool] — Amber is paired with #42858f in 4 real palettes, including Beach Hut and Lemon Squeezy's brand system, as the supporting colour. Seen in: Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), Wired (https://brandsweets.com/colors/brands/wired-com), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com). — https://brandsweets.com/colors/amber
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #42858f: 6 real palettes, including Ink & Paper and Intel's brand system, as the accent. Seen in: Ink & Paper (https://brandsweets.com/palettes/minimal#ink-and-paper), Intel (https://brandsweets.com/colors/brands/intel-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Glacier (https://brandsweets.com/palettes/cool#glacier). — https://brandsweets.com/colors/cobalt
- **Crimson** #dc143c [pool] — Crimson is paired with #42858f in 11 real palettes, including Redfin's brand system and Retro Pop, as the lead colour. Seen in: Redfin (https://brandsweets.com/colors/brands/redfin-com), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), Wendy's (https://brandsweets.com/colors/brands/wendys-com), Diner (https://brandsweets.com/palettes/vivid#diner). — https://brandsweets.com/colors/crimson
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #42858f: 4 real palettes, including Deep Water and Telegram's brand system, as the lead colour. Seen in: Deep Water (https://brandsweets.com/palettes/dark#deep-water), Telegram (https://brandsweets.com/colors/brands/telegram-org), Astro (https://brandsweets.com/colors/brands/astro-build), Venmo (https://brandsweets.com/colors/brands/venmo-com). — https://brandsweets.com/colors/deepskyblue
- **Denim** #1560bd [pool] — Designers have shipped Denim with #42858f: 14 real palettes, including Peacock and Campus, as the supporting colour. Seen in: Peacock (https://brandsweets.com/palettes/vivid#peacock), Campus (https://brandsweets.com/palettes/friendly#campus), Discover (https://brandsweets.com/colors/brands/discover-com), Capital One (https://brandsweets.com/colors/brands/capitalone-com). — https://brandsweets.com/colors/denim
- **Firebrick** #b22222 [pool] — Designers have shipped Firebrick with #42858f: 4 real palettes, including Wendy's's brand system and Honda's brand system, as the supporting colour. Seen in: Wendy's (https://brandsweets.com/colors/brands/wendys-com), Honda (https://brandsweets.com/colors/brands/honda-com), Newsprint (https://brandsweets.com/palettes/editorial#newsprint), AT&T (https://brandsweets.com/colors/brands/att-com). — https://brandsweets.com/colors/firebrick

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

- On white (#ffffff): 4.21:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #3f7e88 (4.61:1); AA: background → #0f0f0f (4.55:1); AAA: text → #2f5e65 (7.22:1)
- On black (#000000): 4.98:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #50a2af (7.13:1)

## Fonts for this mood

- modern: https://brandsweets.com/fonts/mood/modern

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/42858f-a2b7be-df4e81-1f252d-e9f1ee?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: "#42858f" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.