# #403f78

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

## Values

- Hex: `#403f78`
- RGB: rgb(64, 63, 120)
- HSL: hsl(241, 31%, 36%)
- OKLCH: oklch(0.398 0.094 282)
- Relative luminance: 0.06
- Nearest named color: Evening Magic (#363e7d, Δ 1.804) — https://brandsweets.com/colors/evening-magic
- Moods: cool, muted
- Page: https://brandsweets.com/colors/403f78

## Tints & shades

- Tints (toward white): #4b4a8c, #5654a0, #6a69b0, #7e7dba, #9291c5, #a6a5cf, #b9b9da, #d1d0e6, #e4e4f1, #f8f8fb
- Shades (toward black): #3b3a6e, #363564, #2e2e57, #29284d, #242343, #1e1e39, #19192f, #121221, #0d0c17, #07070d

## Harmonies

- Complementary: #77783f
- Analogous: #3f5b78, #5d3f78
- Triadic: #78403f, #3f7840
- Split-complementary: #785d3f, #5b783f
- Tetradic: #783f5b, #77783f, #3f785d

## Colors that go with #403f78

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 #403f78'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), Glacier (https://brandsweets.com/palettes/cool#glacier), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Plaid (https://brandsweets.com/colors/brands/plaid-com). — https://brandsweets.com/colors/steelblue
- **Blue** #0000ff [pool] — 5 real palettes, including Alaska Airlines's brand system and CVS's brand system put Blue beside #403f78, 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), Procter & Gamble (https://brandsweets.com/colors/brands/pg-com). — https://brandsweets.com/colors/blue
- **Crimson** #dc143c [pool] — Crimson is paired with #403f78 in 8 real palettes, including Walgreens's brand system and Marvel's brand system, as the lead colour. Seen in: Walgreens (https://brandsweets.com/colors/brands/walgreens-com), 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). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #403f78: 14 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), HP (https://brandsweets.com/colors/brands/hp-com). — https://brandsweets.com/colors/denim
- **Midnight Blue** #191970 [pool] — 15 real palettes, including Microsoft's brand system and First Snow put Midnight Blue beside #403f78, as the accent. Seen in: Microsoft (https://brandsweets.com/colors/brands/microsoft-com), First Snow (https://brandsweets.com/palettes/cool#first-snow), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Plaid (https://brandsweets.com/colors/brands/plaid-com). — https://brandsweets.com/colors/midnightblue
- **Orange Red** #ff4500 [pool] — Orange Red is paired with #403f78 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 #403f78: 6 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 #403f78: 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): 9.54:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.2:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #706fb3 (4.61:1); AA: background → #b3b3b3 (4.55:1); AAA: text → #9291c5 (7.08:1); AAA: background → #dedede (7.09:1)

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/403f78-a19cc4-df9b4e-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: "#403f78" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.