# #421bd0

A color — cool, vivid, technical, modern. Deterministic analysis from BrandSweets (no inference).

## Values

- Hex: `#421bd0`
- RGB: rgb(66, 27, 208)
- HSL: hsl(253, 77%, 46%)
- OKLCH: oklch(0.431 0.244 278.5)
- Relative luminance: 0.065
- Nearest named color: Busty Blue (#3300cc, Δ 3.542) — https://brandsweets.com/colors/busty-blue
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/421bd0

## Tints & shades

- Tints (toward white): #4c22e2, #5e38e5, #7453e9, #866aec, #9881ef, #ab97f2, #bdaef4, #d3c9f8, #e5dffb, #f8f6fe
- Shades (toward black): #3c19be, #3716ac, #2f1395, #2a1183, #240f71, #1e0c5f, #180a4d, #110736, #0b0524, #060212

## Harmonies

- Complementary: #a8d01b
- Analogous: #1b4ed0, #9c1bd0
- Triadic: #d0421b, #1bd042
- Split-complementary: #d09c1b, #4ed01b
- Tetradic: #d01b4e, #a8d01b, #1bd09c

## Colors that go with #421bd0

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 #421bd0: softer than #000 and cool enough to feel like part of the same palette. Seen in: HP (https://brandsweets.com/colors/brands/hp-com), Campus (https://brandsweets.com/palettes/friendly#campus), UEFA (https://brandsweets.com/colors/brands/uefa-com), Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com). — https://brandsweets.com/colors/charcoal
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #421bd0: 6 real palettes, including Qualcomm's brand system and Blue Mono, as the supporting colour. Seen in: Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Canva (https://brandsweets.com/colors/brands/canva-com), Spotify (https://brandsweets.com/colors/brands/spotify). — https://brandsweets.com/colors/cornflowerblue
- **Crimson** #dc143c [pool] — Crimson is paired with #421bd0 in 5 real palettes, including Behance's brand system and Dunkin''s brand system, as the accent. Seen in: Behance (https://brandsweets.com/colors/brands/behance-net), Dunkin' (https://brandsweets.com/colors/brands/dunkindonuts-com), Tim Hortons (https://brandsweets.com/colors/brands/timhortons-com), Walgreens (https://brandsweets.com/colors/brands/walgreens-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #421bd0: 5 real palettes, including Unilever's brand system and Intel's brand system, as the accent. Seen in: Unilever (https://brandsweets.com/colors/brands/unilever-com), Intel (https://brandsweets.com/colors/brands/intel-com), Pixar (https://brandsweets.com/colors/brands/pixar-com), Dairy Queen (https://brandsweets.com/colors/brands/dairyqueen-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #421bd0: 6 real palettes, including Cargo's brand system and Readymag's brand system, as the lead colour. Seen in: Cargo (https://brandsweets.com/colors/brands/cargo-site), Readymag (https://brandsweets.com/colors/brands/readymag-com), Samsung (https://brandsweets.com/colors/brands/samsung-com), Absolut (https://brandsweets.com/colors/brands/absolut-com). — https://brandsweets.com/colors/dodgerblue
- **Midnight Blue** #191970 [pool] — 10 real palettes, including Kraken's brand system and Purina Pro Plan's brand system put Midnight Blue beside #421bd0, as the lead colour. Seen in: Kraken (https://brandsweets.com/colors/brands/kraken-com), Purina Pro Plan (https://brandsweets.com/colors/brands/chewy-com), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), MLB (https://brandsweets.com/colors/brands/mlb-com). — https://brandsweets.com/colors/midnightblue
- **Orange Red** #ff4500 [pool] — Orange Red is paired with #421bd0 in 8 real palettes, including Prepare your taste buds...'s brand system and Intercom's brand system, as the lead colour. Seen in: Prepare your taste buds... (https://brandsweets.com/colors/brands/grubhub-com), Intercom (https://brandsweets.com/colors/brands/intercom-com), Soundcloud (https://brandsweets.com/colors/brands/soundcloud-com), Doordash (https://brandsweets.com/colors/brands/doordash-com). — https://brandsweets.com/colors/orangered
- **Olive Green** #808000 [harmony: complementary] — Olive Green sits directly opposite #421bd0 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. — https://brandsweets.com/colors/olive

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

- On white (#ffffff): 9.13:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.3:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #7b5dea (4.6:1); AA: background → #b8b8b8 (4.6:1); AAA: text → #9c85ef (7.01:1); AAA: background → #e3e3e3 (7.12:1)

## Fonts for this mood

- technical: https://brandsweets.com/fonts/mood/technical
- modern: https://brandsweets.com/fonts/mood/modern

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/421bd0-a99cc4-dfb84e-281f2d-e9ebf1?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: "#421bd0" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.