# #631cfd

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

## Values

- Hex: `#631cfd`
- RGB: rgb(99, 28, 253)
- HSL: hsl(259, 98%, 55%)
- OKLCH: oklch(0.509 0.284 284)
- Relative luminance: 0.1058
- Nearest named color: Electric Indigo (#6600ff, Δ 1.262) — https://brandsweets.com/colors/electric-indigo
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/631cfd

## Tints & shades

- Tints (toward white): #7130fd, #8249fd, #905dfd, #9e72fe, #af8bfe, #bd9ffe, #cbb3fe, #d9c7fe, #eae1ff, #f8f5ff
- Shades (toward black): #5203fc, #4a02e3, #4102ca, #3902b1, #310297, #270179, #1f0160, #170147, #0f002d, #070014

## Harmonies

- Complementary: #b5fd1c
- Analogous: #1c45fd, #d31cfd
- Triadic: #fd631c, #1cfd63
- Split-complementary: #fdd31c, #45fd1c
- Tetradic: #fd1c45, #b5fd1c, #1cfdd3

## Colors that go with #631cfd

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 #631cfd: softer than #000 and cool enough to feel like part of the same palette. Seen in: Campus (https://brandsweets.com/palettes/friendly#campus), Docker (https://brandsweets.com/colors/brands/docker-com), Zoom (https://brandsweets.com/colors/brands/zoom-us), HP (https://brandsweets.com/colors/brands/hp-com). — https://brandsweets.com/colors/charcoal
- **Royal Blue** #4169e1 [harmony, pool: analogous] — Royal Blue is #631cfd's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Yahoo (https://brandsweets.com/colors/brands/yahoo-com), Signal (https://brandsweets.com/colors/brands/signal-org), EA (https://brandsweets.com/colors/brands/ea-com), Penpot (https://brandsweets.com/colors/brands/penpot-app). — https://brandsweets.com/colors/royalblue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #631cfd: 5 real palettes, including Nokia's brand system and NHL's brand system, as the lead colour. Seen in: Nokia (https://brandsweets.com/colors/brands/nokia-com), NHL (https://brandsweets.com/colors/brands/nhl-com), Zillow (https://brandsweets.com/colors/brands/zillow-com), Oreo (https://brandsweets.com/colors/brands/oreo-com). — https://brandsweets.com/colors/cobalt
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #631cfd: 4 real palettes, including Render's brand system and Warp's brand system, as the supporting colour. Seen in: Render (https://brandsweets.com/colors/brands/render-com), Warp (https://brandsweets.com/colors/brands/warp-dev), Kraken (https://brandsweets.com/colors/brands/kraken-com), Calm (https://brandsweets.com/colors/brands/calm-com). — https://brandsweets.com/colors/deepskyblue
- **Midnight Blue** #191970 [pool] — 4 real palettes, including Kraken's brand system and Penpot's brand system put Midnight Blue beside #631cfd, as the lead colour. Seen in: Kraken (https://brandsweets.com/colors/brands/kraken-com), Penpot (https://brandsweets.com/colors/brands/penpot-app), Discord (https://brandsweets.com/colors/brands/discord), Spectrum (https://brandsweets.com/colors/brands/spectrum-com). — https://brandsweets.com/colors/midnightblue
- **Olive Green** #808000 [harmony: complementary] — Olive Green sits directly opposite #631cfd 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
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #631cfd: 3 real palettes, including Qualcomm's brand system and Roblox's brand system, as the supporting colour. Seen in: Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Roblox (https://brandsweets.com/colors/brands/roblox-com), Mastodon hosted on mastodon.social (https://brandsweets.com/colors/brands/mastodon-social). — https://brandsweets.com/colors/cornflowerblue
- **Crimson** #dc143c [pool] — Crimson is paired with #631cfd in 3 real palettes, including Gemstone and Coinbase's brand system, as the accent. Seen in: Gemstone (https://brandsweets.com/palettes/vivid#gemstone), Coinbase (https://brandsweets.com/colors/brands/coinbase), Toyota (https://brandsweets.com/colors/brands/toyota-com). — https://brandsweets.com/colors/crimson

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

- On white (#ffffff): 6.74:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #5c12fd (7.09:1)
- On black (#000000): 3.12:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #864efd (4.52:1); AA: background → #d4d4d4 (4.55:1); AAA: text → #a881fe (7.24:1)

## 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/631cfd-ad9cc4-dfc74e-2a1f2d-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: "#631cfd" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.