# #3f617d

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

## Values

- Hex: `#3f617d`
- RGB: rgb(63, 97, 125)
- HSL: hsl(207, 33%, 37%)
- OKLCH: oklch(0.479 0.06 244.4)
- Relative luminance: 0.1109
- Nearest named color: Atlantis (#336172, Δ 2.37) — https://brandsweets.com/colors/atlantis
- Moods: cool, muted
- Page: https://brandsweets.com/colors/3f617d

## Tints & shades

- Tints (toward white): #497192, #5481a6, #6690b2, #7b9fbc, #92b0c8, #a7bfd3, #bbcedd, #d0dce7, #e4ebf1, #f8fafc
- Shades (toward black): #3a5a73, #334f66, #2e475c, #293f51, #243747, #1d2d3a, #18252f, #131d25, #0c1218, #070b0e

## Harmonies

- Complementary: #7d5b3f
- Analogous: #3f7d7a, #3f427d
- Triadic: #7d3f61, #617d3f
- Split-complementary: #7d3f42, #7d7a3f
- Tetradic: #7a3f7d, #7d5b3f, #427d3f

## Colors that go with #3f617d

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 #3f617d: 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), Amazon (https://brandsweets.com/colors/brands/amazon-com), Gusto (https://brandsweets.com/colors/brands/gusto-com). — https://brandsweets.com/colors/charcoal
- **Sienna** #a0522d [harmony, pool: complementary] — Sienna sits directly opposite #3f617d 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 #3f617d in 5 real palettes, including McDonald's's brand system and Lemon Squeezy's brand system, as the lead colour. Seen in: McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), Warner Bros. (https://brandsweets.com/colors/brands/warnerbros-com), Wired (https://brandsweets.com/colors/brands/wired-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 6 real palettes, including Activision's brand system and Tesco's brand system put Blue beside #3f617d, as the accent. Seen in: Activision (https://brandsweets.com/colors/brands/activision-com), Tesco (https://brandsweets.com/colors/brands/tesco-com), CVS (https://brandsweets.com/colors/brands/cvs-com), Pixar (https://brandsweets.com/colors/brands/pixar-com). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #3f617d: 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), Unilever (https://brandsweets.com/colors/brands/unilever-com), Glacier (https://brandsweets.com/palettes/cool#glacier). — https://brandsweets.com/colors/cobalt
- **Copper** #b87333 [pool] — Designers have shipped Copper with #3f617d: 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 #3f617d in 16 real palettes, including Wendy's's brand system and McDonald's's brand system, as the lead colour. Seen in: Wendy's (https://brandsweets.com/colors/brands/wendys-com), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Gemstone (https://brandsweets.com/palettes/vivid#gemstone), Codecademy (https://brandsweets.com/colors/brands/codecademy-com). — https://brandsweets.com/colors/crimson
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #3f617d: 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), Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com), Warp (https://brandsweets.com/colors/brands/warp-dev). — https://brandsweets.com/colors/deepskyblue

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

- On white (#ffffff): 6.53:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #3c5c77 (7.02:1)
- On black (#000000): 3.22:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #4f799c (4.55:1); AA: background → #d9d9d9 (4.62:1); AAA: text → #749ab9 (7.07:1)

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/3f617d-9cadc4-df4e53-1f212d-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: "#3f617d" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.