# #6331b4

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

## Values

- Hex: `#6331b4`
- RGB: rgb(99, 49, 180)
- HSL: hsl(263, 57%, 45%)
- OKLCH: oklch(0.456 0.193 295)
- Relative luminance: 0.0814
- Nearest named color: rebeccapurple (#663399, Δ 4.46) — https://brandsweets.com/colors/rebeccapurple
- Moods: cool, modern
- Page: https://brandsweets.com/colors/6331b4

## Tints & shades

- Tints (toward white): #6f37c8, #804fcf, #8e63d4, #9d77da, #ae8fe0, #bda3e6, #cbb7eb, #d9cbf1, #ebe3f7, #f9f7fd
- Shades (toward black): #5b2da4, #522994, #492484, #402074, #371b64, #2c1650, #231240, #1b0d30, #120920, #090410

## Harmonies

- Complementary: #82b431
- Analogous: #3141b4, #a531b4
- Triadic: #b46331, #31b463
- Split-complementary: #b4a531, #41b431
- Tetradic: #b43141, #82b431, #31b4a5

## Colors that go with #6331b4

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 #6331b4: softer than #000 and cool enough to feel like part of the same palette. Seen in: dbt Labs (https://brandsweets.com/colors/brands/getdbt-com), UEFA (https://brandsweets.com/colors/brands/uefa-com), Hinge (https://brandsweets.com/colors/brands/hinge-co), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com). — https://brandsweets.com/colors/charcoal
- **Royal Blue** #4169e1 [harmony, pool: analogous] — Royal Blue is #6331b4's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Wayfair (https://brandsweets.com/colors/brands/wayfair-com), Fivetran blue (https://brandsweets.com/colors/brands/fivetran-com), Guinness (https://brandsweets.com/colors/brands/guinness-com), NHL (https://brandsweets.com/colors/brands/nhl-com). — https://brandsweets.com/colors/royalblue
- **Sea Green** #2e8b57 [harmony, pool: split] — Sea Green is a split-complement of #6331b4: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Netflix (https://brandsweets.com/colors/brands/netflix), Paramount+ (https://brandsweets.com/colors/brands/paramountplus-com), Intel (https://brandsweets.com/colors/brands/intel-com). — https://brandsweets.com/colors/seagreen
- **Crimson** #dc143c [pool] — Crimson is paired with #6331b4 in 6 real palettes, including Wells Fargo's brand system and Gemstone, as the lead colour. Seen in: Wells Fargo (https://brandsweets.com/colors/brands/wellsfargo-com), Gemstone (https://brandsweets.com/palettes/vivid#gemstone), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Netflix (https://brandsweets.com/colors/brands/netflix). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #6331b4: 5 real palettes, including Slack's brand system and Linkedin's brand system, as the lead colour. Seen in: Slack (https://brandsweets.com/colors/brands/slack-com), Linkedin (https://brandsweets.com/colors/brands/linkedin-com), Unilever (https://brandsweets.com/colors/brands/unilever-com), Warbyparker (https://brandsweets.com/colors/brands/warbyparker-com). — https://brandsweets.com/colors/denim
- **Midnight Blue** #191970 [pool] — 8 real palettes, including Kraken's brand system and Blue Mono put Midnight Blue beside #6331b4, as the lead colour. Seen in: Kraken (https://brandsweets.com/colors/brands/kraken-com), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Purina Pro Plan (https://brandsweets.com/colors/brands/chewy-com), Panasonic (https://brandsweets.com/colors/brands/panasonic-com). — https://brandsweets.com/colors/midnightblue
- **Tomato** #ff6347 [pool] — 5 real palettes, including GitLab's brand system and FedEx's brand system put Tomato beside #6331b4, as the lead colour. Seen in: GitLab (https://brandsweets.com/colors/brands/gitlab), FedEx (https://brandsweets.com/colors/brands/fedex-com), dbt Labs (https://brandsweets.com/colors/brands/getdbt-com), Fivetran blue (https://brandsweets.com/colors/brands/fivetran-com). — https://brandsweets.com/colors/tomato
- **Olive Green** #808000 [harmony: complementary] — Olive Green sits directly opposite #6331b4 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): 7.99:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.63:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #8b5fd3 (4.68:1); AA: background → #c4c4c4 (4.58:1); AAA: text → #a887de (7.19:1); AAA: background → #f0f0f0 (7.01:1)

## Brands using this color

- **Deno** — primary #6639ba (Δ 1.895) — https://brandsweets.com/colors/brands/deno-com
- **Deno** — accent #6639ba (Δ 1.895) — https://brandsweets.com/colors/brands/deno-com

## Fonts for this mood

- 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/6331b4-b09cc4-dfd04e-2b1f2d-e9eaf1?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: "#6331b4" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.