# #578dcb

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

## Values

- Hex: `#578dcb`
- RGB: rgb(87, 141, 203)
- HSL: hsl(212, 53%, 57%)
- OKLCH: oklch(0.633 0.11 252.9)
- Relative luminance: 0.2539
- Nearest named color: Blue Jay (#5588dd, Δ 3.35) — https://brandsweets.com/colors/blue-jay
- Moods: cool, modern
- Page: https://brandsweets.com/colors/578dcb

## Tints & shades

- Tints (toward white): #6798d0, #76a3d5, #86adda, #96b8df, #a9c5e5, #b9cfe9, #c8daee, #d8e5f3, #e8eff8, #f7fafd
- Shades (toward black): #4480c5, #3771b3, #3165a0, #2b598c, #254c79, #1e3d62, #18314e, #12253b, #0b1623, #050a10

## Harmonies

- Complementary: #cb9557
- Analogous: #57c8cb, #5b57cb
- Triadic: #cb578d, #8dcb57
- Split-complementary: #cb5b57, #c8cb57
- Tetradic: #cb57c8, #cb9557, #57cb5b

## Colors that go with #578dcb

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 #578dcb: softer than #000 and cool enough to feel like part of the same palette. Seen in: Plaid (https://brandsweets.com/colors/brands/plaid-com), Dusty Blue (https://brandsweets.com/palettes/cool#dusty-blue), Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Bloomberg (https://brandsweets.com/colors/brands/bloomberg-com). — https://brandsweets.com/colors/charcoal
- **Copper** #b87333 [harmony, pool: complementary] — Copper sits directly opposite #578dcb on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Notion (https://brandsweets.com/colors/brands/notion), Dusk (https://brandsweets.com/palettes/cool#dusk). — https://brandsweets.com/colors/copper
- **Amber** #ffbf00 [pool] — Amber is paired with #578dcb in 12 real palettes, including Beach Hut and Google's brand system, as the supporting colour. Seen in: Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Google (https://brandsweets.com/colors/brands/google-com), Wired (https://brandsweets.com/colors/brands/wired-com), Heatwave (https://brandsweets.com/palettes/warm#heatwave). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 7 real palettes, including Qualcomm's brand system and Readymag's brand system put Blue beside #578dcb, as the accent. Seen in: Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Readymag (https://brandsweets.com/colors/brands/readymag-com), Unity (https://brandsweets.com/colors/brands/unity-com), Cargo (https://brandsweets.com/colors/brands/cargo-site). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #578dcb: 7 real palettes, including Hershey's's brand system and Blue Mono, as the supporting colour. Seen in: Hershey's (https://brandsweets.com/colors/brands/hersheys-com), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Glacier (https://brandsweets.com/palettes/cool#glacier), General Mills (https://brandsweets.com/colors/brands/generalmills-com). — https://brandsweets.com/colors/cobalt
- **Crimson** #dc143c [pool] — Crimson is paired with #578dcb in 7 real palettes, including NASCAR's brand system and Retro Pop, as the supporting colour. Seen in: NASCAR (https://brandsweets.com/colors/brands/nascar-com), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), Marvel (https://brandsweets.com/colors/brands/marvel-com), Wendy's (https://brandsweets.com/colors/brands/wendys-com). — https://brandsweets.com/colors/crimson
- **Dark Orange** #ff8c00 [pool] — Dark Orange shows up next to #578dcb in 4 real palettes, including Elastic's brand system and Playground, as the lead colour. Seen in: Elastic (https://brandsweets.com/colors/brands/elastic-co), Playground (https://brandsweets.com/palettes/bold#playground), Ahrefs (https://brandsweets.com/colors/brands/ahrefs-com), Learning App (https://brandsweets.com/palettes/playful#learning-app). — https://brandsweets.com/colors/darkorange
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #578dcb: 9 real palettes, including Telegram's brand system and Patreon's brand system, as the lead colour. Seen in: Telegram (https://brandsweets.com/colors/brands/telegram-org), Patreon (https://brandsweets.com/colors/brands/patreon-com), Astro (https://brandsweets.com/colors/brands/astro-build), Figma (https://brandsweets.com/colors/brands/figma). — https://brandsweets.com/colors/deepskyblue

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

- On white (#ffffff): 3.46:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #3a76bb (4.68:1); AA: background → #212121 (4.66:1); AAA: text → #2b598c (7.22:1)
- On black (#000000): 6.08:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #6b9bd1 (7.23:1)

## Brands using this color

- **Retool** — accent #518dd2 (Δ 1.171) — https://brandsweets.com/colors/brands/retool-com

## 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/578dcb-9caac4-df564e-1f202d-e9f1f1?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: "#578dcb" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.