# #631bbb

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

## Values

- Hex: `#631bbb`
- RGB: rgb(99, 27, 187)
- HSL: hsl(267, 75%, 42%)
- OKLCH: oklch(0.441 0.221 295.7)
- Relative luminance: 0.0702
- Nearest named color: Fuchsia Nebula (#7722aa, Δ 5.287) — https://brandsweets.com/colors/fuchsia-nebula
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/631bbb

## Tints & shades

- Tints (toward white): #711fd6, #7e2de1, #8f48e5, #9c5ee8, #ad79ec, #bd94f0, #cbaaf3, #dbc5f7, #e9dbfa, #faf6fe
- Shades (toward black): #5a18aa, #501698, #49148a, #401178, #360f67, #2d0c55, #230a43, #1c0836, #130524, #090312

## Harmonies

- Complementary: #73bb1b
- Analogous: #1b23bb, #b31bbb
- Triadic: #bb631b, #1bbb63
- Split-complementary: #bbb31b, #23bb1b
- Tetradic: #bb1b23, #73bb1b, #1bbbb3

## Colors that go with #631bbb

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

- **Tomato** #ff6347 [pool] — 4 real palettes, including GitLab's brand system and FedEx's brand system put Tomato beside #631bbb, 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), Etsy (https://brandsweets.com/colors/brands/etsy-com). — https://brandsweets.com/colors/tomato
- **Olive Green** #808000 [harmony: complementary] — Olive Green sits directly opposite #631bbb 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
- **Charcoal** #36454f [role, pool] — Charcoal is the text near-black for #631bbb: 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). — https://brandsweets.com/colors/charcoal
- **Denim** #1560bd [pool] — Designers have shipped Denim with #631bbb: 3 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). — https://brandsweets.com/colors/denim
- **Midnight Blue** #191970 [pool] — 3 real palettes, including Kraken's brand system and Blue Mono put Midnight Blue beside #631bbb, 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). — https://brandsweets.com/colors/midnightblue
- **Teal** #008080 [harmony, pool: triadic] — Teal completes a triad with #631bbb — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Gemstone (https://brandsweets.com/palettes/vivid#gemstone). — https://brandsweets.com/colors/teal
- **Forest Green** #228b22 [harmony: split] — Forest Green is a split-complement of #631bbb: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/forestgreen
- **Royal Blue** #4169e1 [harmony, pool: analogous] — Royal Blue is #631bbb'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). — https://brandsweets.com/colors/royalblue

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

- On white (#ffffff): 8.73:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.4:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #9451e6 (4.58:1); AA: background → #bdbdbd (4.65:1); AAA: text → #b07eed (7.05:1); AAA: background → #e8e8e8 (7.13:1)

## Brands using this color

- **Xfinity** — secondary #5a23b9 (Δ 1.886) — https://brandsweets.com/colors/brands/xfinity-com

## 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/631bbb-b39cc4-dfda4e-2c1f2d-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: "#631bbb" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.