# #631fbd

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

## Values

- Hex: `#631fbd`
- RGB: rgb(99, 31, 189)
- HSL: hsl(266, 72%, 43%)
- OKLCH: oklch(0.446 0.22 294.9)
- Relative luminance: 0.0731
- Nearest named color: Blurple (#5539cc, Δ 5.209) — https://brandsweets.com/colors/blurple
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/631fbd

## Tints & shades

- Tints (toward white): #7123d7, #7e35de, #8f50e2, #9d65e6, #ae80ea, #bc96ee, #cdb0f2, #dbc6f6, #ebe0fa, #f9f6fe
- Shades (toward black): #5a1cab, #51199a, #471688, #3e1376, #371169, #2e0e58, #250b46, #1c0935, #120623, #090312

## Harmonies

- Complementary: #78bd1f
- Analogous: #1f29bd, #b21fbd
- Triadic: #bd631f, #1fbd63
- Split-complementary: #bdb21f, #29bd1f
- Tetradic: #bd1f29, #78bd1f, #1fbdb2

## Colors that go with #631fbd

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

- **Royal Blue** #4169e1 [harmony, pool: analogous] — Royal Blue is #631fbd'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), Yahoo (https://brandsweets.com/colors/brands/yahoo-com), Fivetran blue (https://brandsweets.com/colors/brands/fivetran-com). — https://brandsweets.com/colors/royalblue
- **Tomato** #ff6347 [pool] — 5 real palettes, including GitLab's brand system and FedEx's brand system put Tomato beside #631fbd, 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 #631fbd 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 #631fbd: 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). — https://brandsweets.com/colors/charcoal
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #631fbd: 3 real palettes, including Peacock's brand system and Blue Mono, as the accent. Seen in: Peacock (https://brandsweets.com/colors/brands/peacocktv-com), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com). — https://brandsweets.com/colors/cornflowerblue
- **Denim** #1560bd [pool] — Designers have shipped Denim with #631fbd: 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 #631fbd, 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 #631fbd — 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), Stripe (https://brandsweets.com/colors/brands/stripe). — https://brandsweets.com/colors/teal

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

- On white (#ffffff): 8.53:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.46:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #9254e3 (4.6:1); AA: background → #bdbdbd (4.54:1); AAA: text → #ae80ea (7.08:1); AAA: background → #ebebeb (7.16:1)

## Brands using this color

- **Kraken** — secondary #5c29be (Δ 1.781) — https://brandsweets.com/colors/brands/kraken-com
- **Xfinity** — secondary #5a23b9 (Δ 1.827) — 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/631fbd-b29cc4-dfd74e-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: "#631fbd" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.