# #3f5769

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

## Values

- Hex: `#3f5769`
- RGB: rgb(63, 87, 105)
- HSL: hsl(206, 25%, 33%)
- OKLCH: oklch(0.445 0.042 241.3)
- Relative luminance: 0.0889
- Nearest named color: Arctic Nights (#345c61, Δ 2.696) — https://brandsweets.com/colors/arctic-nights
- Moods: cool, muted
- Page: https://brandsweets.com/colors/3f5769

## Tints & shades

- Tints (toward white): #4d6980, #587993, #698ba5, #7c9ab1, #93abbe, #a6bac9, #bccbd7, #cfdae2, #e6ebf0, #f9fafb
- Shades (toward black): #394f60, #344756, #2e3f4d, #283743, #24323d, #1f2a33, #192229, #131a20, #0d1216, #080b0d

## Harmonies

- Complementary: #69513f
- Analogous: #3f6966, #3f4269
- Triadic: #693f57, #57693f
- Split-complementary: #693f42, #69663f
- Tetradic: #663f69, #69513f, #42693f

## Colors that go with #3f5769

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

- **Sienna** #a0522d [harmony, pool: complementary] — Sienna sits directly opposite #3f5769 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
- **Blue** #0000ff [pool] — 7 real palettes, including Jeep's brand system and Alaska Airlines's brand system put Blue beside #3f5769, as the accent. Seen in: Jeep (https://brandsweets.com/colors/brands/jeep-com), Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com), Tesco (https://brandsweets.com/colors/brands/tesco-com), CVS (https://brandsweets.com/colors/brands/cvs-com). — https://brandsweets.com/colors/blue
- **Cadet Blue** #5f9ea0 [pool] — Designers have shipped Cadet Blue with #3f5769: 4 real palettes, including Dusk and Open House, as the supporting colour. Seen in: Dusk (https://brandsweets.com/palettes/cool#dusk), Open House (https://brandsweets.com/palettes/clean#open-house), Alpine (https://brandsweets.com/palettes/cool#alpine), Paper & Pine (https://brandsweets.com/palettes/minimal#paper-and-pine). — https://brandsweets.com/colors/cadetblue
- **Crimson** #dc143c [pool] — Crimson is paired with #3f5769 in 7 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), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Costco (https://brandsweets.com/colors/brands/costco-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #3f5769: 13 real palettes, including HP's brand system and Hinge's brand system, as the accent. Seen in: HP (https://brandsweets.com/colors/brands/hp-com), Hinge (https://brandsweets.com/colors/brands/hinge-co), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Starlink (https://brandsweets.com/colors/brands/starlink-com). — https://brandsweets.com/colors/denim
- **Goldenrod** #daa520 [pool] — Goldenrod shows up next to #3f5769 in 5 real palettes, including Fireside and Open House, as the accent. Seen in: Fireside (https://brandsweets.com/palettes/dark#fireside), Open House (https://brandsweets.com/palettes/clean#open-house), Mid-Century (https://brandsweets.com/palettes/warm#mid-century), Disney (https://brandsweets.com/colors/brands/disney-com). — https://brandsweets.com/colors/goldenrod
- **Medium Sea Green** #3cb371 [pool] — Medium Sea Green is paired with #3f5769 in 5 real palettes, including Console Light and Mint Modern, as the accent. Seen in: Console Light (https://brandsweets.com/palettes/technical#console-light), Mint Modern (https://brandsweets.com/palettes/modern#mint-modern), Undergrowth (https://brandsweets.com/palettes/dark#undergrowth), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/mediumseagreen
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #3f5769: 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): 7.56:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.78:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #587993 (4.57:1); AA: background → #c9c9c9 (4.56:1); AAA: text → #7c9ab1 (7.11:1); AAA: background → #f7f7f7 (7.05:1)

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/3f5769-9caec4-df4e56-1f212d-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: "#3f5769" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.