# #3f3d71

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

## Values

- Hex: `#3f3d71`
- RGB: rgb(63, 61, 113)
- HSL: hsl(242, 30%, 34%)
- OKLCH: oklch(0.388 0.087 283.3)
- Relative luminance: 0.0559
- Nearest named color: Evening Magic (#363e7d, Δ 2.384) — https://brandsweets.com/colors/evening-magic
- Moods: cool, muted
- Page: https://brandsweets.com/colors/3f3d71

## Tints & shades

- Tints (toward white): #494785, #56549c, #6663ab, #7c7ab8, #908ec2, #a4a2cd, #bab9da, #cecde4, #e5e4f1, #f8f8fb
- Shades (toward black): #393767, #33325d, #2e2d53, #282749, #23223f, #1d1d35, #18172b, #121221, #0d0c17, #07070d

## Harmonies

- Complementary: #6f713d
- Analogous: #3d5571, #583d71
- Triadic: #713e3d, #3d713e
- Split-complementary: #71583d, #55713d
- Tetradic: #713d55, #6f713d, #3d7158

## Colors that go with #3f3d71

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

- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #3f3d71'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), Glacier (https://brandsweets.com/palettes/cool#glacier), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/steelblue
- **Blue** #0000ff [pool] — 7 real palettes, including Alaska Airlines's brand system and CVS's brand system put Blue beside #3f3d71, as the accent. Seen in: Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com), CVS (https://brandsweets.com/colors/brands/cvs-com), Tesco (https://brandsweets.com/colors/brands/tesco-com), Jeep (https://brandsweets.com/colors/brands/jeep-com). — https://brandsweets.com/colors/blue
- **Crimson** #dc143c [pool] — Crimson is paired with #3f3d71 in 8 real palettes, including Marvel's brand system and Casper Sleep's brand system, as the accent. Seen in: Marvel (https://brandsweets.com/colors/brands/marvel-com), Casper Sleep (https://brandsweets.com/colors/brands/casper-com), Codecademy (https://brandsweets.com/colors/brands/codecademy-com), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #3f3d71: 15 real palettes, including Hinge's brand system and Jack Daniel's's brand system, as the accent. Seen in: 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), Hasbro (https://brandsweets.com/colors/brands/hasbro-com). — https://brandsweets.com/colors/denim
- **Midnight Blue** #191970 [pool] — 13 real palettes, including Microsoft's brand system and First Snow put Midnight Blue beside #3f3d71, as the accent. Seen in: Microsoft (https://brandsweets.com/colors/brands/microsoft-com), First Snow (https://brandsweets.com/palettes/cool#first-snow), Plaid (https://brandsweets.com/colors/brands/plaid-com), Gillette (https://brandsweets.com/colors/brands/gillette-com). — https://brandsweets.com/colors/midnightblue
- **Orange Red** #ff4500 [pool] — Orange Red is paired with #3f3d71 in 5 real palettes, including Tumblr's brand system and NASA's brand system, as the accent. Seen in: Tumblr (https://brandsweets.com/colors/brands/tumblr-com), NASA (https://brandsweets.com/colors/brands/nasa-gov), Tide (https://brandsweets.com/colors/brands/tide-com), Audi (https://brandsweets.com/colors/brands/audi-com). — https://brandsweets.com/colors/orangered
- **Powder Blue** #b0e0e6 [pool] — Designers have shipped Powder Blue with #3f3d71: 7 real palettes, including First Snow and Glacier, as the accent. Seen in: First Snow (https://brandsweets.com/palettes/cool#first-snow), Glacier (https://brandsweets.com/palettes/cool#glacier), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember), Macaron (https://brandsweets.com/palettes/light#macaron). — https://brandsweets.com/colors/powderblue
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #3f3d71: 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): 9.92:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.12:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #7370b2 (4.69:1); AA: background → #b0b0b0 (4.57:1); AAA: text → #9392c4 (7.15:1); AAA: background → #d9d9d9 (7.03:1)

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/3f3d71-a29cc4-df9e4e-261f2d-e9edf1?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: "#3f3d71" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.