# #3f435a

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

## Values

- Hex: `#3f435a`
- RGB: rgb(63, 67, 90)
- HSL: hsl(231, 18%, 30%)
- OKLCH: oklch(0.389 0.039 276.7)
- Relative luminance: 0.0581
- Nearest named color: Bonne Nuit (#3a4866, Δ 2.24) — https://brandsweets.com/colors/bonne-nuit
- Moods: cool, muted, dark, luxury, bold
- Page: https://brandsweets.com/colors/3f435a

## Tints & shades

- Tints (toward white): #4d526f, #5c6284, #696f96, #7e84a5, #9398b4, #a8acc2, #bdc0d1, #cfd1de, #e4e5ec, #f9f9fb
- Shades (toward black): #383c51, #34384b, #2e3142, #2a2d3c, #242633, #1d1f2a, #191b24, #13141b, #0f1015, #08090c

## Harmonies

- Complementary: #5a563f
- Analogous: #3f515a, #483f5a
- Triadic: #5a3f43, #435a3f
- Split-complementary: #5a483f, #515a3f
- Tetradic: #5a3f51, #5a563f, #3f5a48

## Colors that go with #3f435a

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

- **Sea Green** #2e8b57 [harmony, pool: triadic] — Sea Green completes a triad with #3f435a — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Asana (https://brandsweets.com/colors/brands/asana-com), Subaru (https://brandsweets.com/colors/brands/subaru-com), Mushroom (https://brandsweets.com/palettes/neutral#mushroom). — https://brandsweets.com/colors/seagreen
- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #3f435a's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Auth0 (https://brandsweets.com/colors/brands/auth0-com), Plaid (https://brandsweets.com/colors/brands/plaid-com), Capital One (https://brandsweets.com/colors/brands/capitalone-com), Glacier (https://brandsweets.com/palettes/cool#glacier). — https://brandsweets.com/colors/steelblue
- **Dark Olive Green** #556b2f [harmony, pool: complementary] — Dark Olive Green sits directly opposite #3f435a on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Olive Grove (https://brandsweets.com/palettes/muted#olive-grove). — https://brandsweets.com/colors/darkolivegreen
- **Blue** #0000ff [pool] — 9 real palettes, including Jeep's brand system and Alaska Airlines's brand system put Blue beside #3f435a, as the accent. Seen in: Jeep (https://brandsweets.com/colors/brands/jeep-com), Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com), Dunkin' (https://brandsweets.com/colors/brands/dunkindonuts-com), Minecraft (https://brandsweets.com/colors/brands/minecraft-net). — https://brandsweets.com/colors/blue
- **Blush Pink** #e8b4b8 [pool] — 4 real palettes, including Nursery and Garden Wedding put Blush Pink beside #3f435a, as the lead colour. Seen in: Nursery (https://brandsweets.com/palettes/light#nursery), Garden Wedding (https://brandsweets.com/palettes/light#garden-wedding), Rain Garden (https://brandsweets.com/palettes/cool#rain-garden), Blush (https://brandsweets.com/palettes/light#blush). — https://brandsweets.com/colors/blush-pink
- **Cadet Blue** #5f9ea0 [pool] — Designers have shipped Cadet Blue with #3f435a: 5 real palettes, including Paper & Pine and Clean Beauty, as the supporting colour. Seen in: Paper & Pine (https://brandsweets.com/palettes/minimal#paper-and-pine), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty), Dusk (https://brandsweets.com/palettes/cool#dusk), Open House (https://brandsweets.com/palettes/clean#open-house). — https://brandsweets.com/colors/cadetblue
- **Copper** #b87333 [pool] — Designers have shipped Copper with #3f435a: 6 real palettes, including Notion's brand system and Desert Road. Seen in: Notion (https://brandsweets.com/colors/brands/notion), Desert Road (https://brandsweets.com/palettes/warm#desert-road), Bramble (https://brandsweets.com/palettes/muted#bramble), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty). — https://brandsweets.com/colors/copper
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #3f435a: 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): 9.71:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.16:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #6c7299 (4.5:1); AA: background → #b3b3b3 (4.63:1); AAA: text → #9095b2 (7.13:1); AAA: background → #dbdbdb (7.02:1)

## Brands using this color

- **Tumblr** — secondary #36465d (Δ 1.498) — https://brandsweets.com/colors/brands/tumblr-com

## Fonts for this mood

- luxury: https://brandsweets.com/fonts/mood/luxury
- bold: https://brandsweets.com/fonts/mood/bold

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/3f435a-9c9ec4-df834e-231f2d-e9eef1?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: "#3f435a" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.