# #3721ca

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

## Values

- Hex: `#3721ca`
- RGB: rgb(55, 33, 202)
- HSL: hsl(248, 72%, 46%)
- OKLCH: oklch(0.421 0.237 275)
- Relative luminance: 0.0616
- Nearest named color: Busty Blue (#3300cc, Δ 2.596) — https://brandsweets.com/colors/busty-blue
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/3721ca

## Tints & shades

- Tints (toward white): #4028dc, #543ee0, #6b58e4, #7e6ee7, #9284eb, #a59aef, #b9b0f2, #d0caf6, #e4e0fa, #f7f6fe
- Shades (toward black): #331eb8, #2e1ba7, #281891, #23157f, #1e126e, #190f5c, #140c4b, #0e0935, #0a0623, #050312

## Harmonies

- Complementary: #b3ca21
- Analogous: #215fca, #8c21ca
- Triadic: #ca3721, #21ca37
- Split-complementary: #ca8c21, #5fca21
- Tetradic: #ca215f, #b3ca21, #21ca8c

## Colors that go with #3721ca

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 #3721ca: softer than #000 and cool enough to feel like part of the same palette. Seen in: HP (https://brandsweets.com/colors/brands/hp-com), Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com), Jeep (https://brandsweets.com/colors/brands/jeep-com), UEFA (https://brandsweets.com/colors/brands/uefa-com). — https://brandsweets.com/colors/charcoal
- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #3721ca's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Hershey's (https://brandsweets.com/colors/brands/hersheys-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), FedEx (https://brandsweets.com/colors/brands/fedex-com), Glacier (https://brandsweets.com/palettes/cool#glacier). — https://brandsweets.com/colors/steelblue
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #3721ca: 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 #3721ca in 6 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 #3721ca: 7 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), Activision (https://brandsweets.com/colors/brands/activision-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #3721ca: 6 real palettes, including Absolut's brand system and Cargo's brand system, as the supporting colour. Seen in: Absolut (https://brandsweets.com/colors/brands/absolut-com), Cargo (https://brandsweets.com/colors/brands/cargo-site), Readymag (https://brandsweets.com/colors/brands/readymag-com), Samsung (https://brandsweets.com/colors/brands/samsung-com). — https://brandsweets.com/colors/dodgerblue
- **Firebrick** #b22222 [pool] — Designers have shipped Firebrick with #3721ca: 4 real palettes, including 3M's brand system and MLB's brand system, as the supporting colour. Seen in: 3M (https://brandsweets.com/colors/brands/3m-com), MLB (https://brandsweets.com/colors/brands/mlb-com), Datadog (https://brandsweets.com/colors/brands/datadoghq-com), Nissan (https://brandsweets.com/colors/brands/nissanusa-com). — https://brandsweets.com/colors/firebrick
- **Medium Sea Green** #3cb371 [pool] — Medium Sea Green is paired with #3721ca in 4 real palettes, including Spotify's brand system and Indigo SaaS, as the lead colour. Seen in: Spotify (https://brandsweets.com/colors/brands/spotify), Indigo SaaS (https://brandsweets.com/palettes/modern#indigo-saas), Unity (https://brandsweets.com/colors/brands/unity-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/mediumseagreen

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

- On white (#ffffff): 9.41:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.23:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #7361e5 (4.57:1); AA: background → #b5b5b5 (4.59:1); AAA: text → #9689ec (7.09:1); AAA: background → #e0e0e0 (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/3721ca-a69cc4-dfac4e-271f2d-e9ecf1?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: "#3721ca" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.