# #666fea

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

## Values

- Hex: `#666fea`
- RGB: rgb(102, 111, 234)
- HSL: hsl(236, 76%, 66%)
- OKLCH: oklch(0.598 0.183 276.2)
- Relative luminance: 0.2013
- Nearest named color: Blue Öyster Cult (#5577ee, Δ 2.59) — https://brandsweets.com/colors/blue-oyster-cult
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/666fea

## Tints & shades

- Tints (toward white): #747cec, #8189ee, #9399f0, #a1a6f2, #aeb3f4, #bcc0f6, #c9ccf8, #dbddfa, #e9eafc, #f6f7fe
- Shades (toward black): #4b56e7, #313ce3, #1d29d3, #1924b8, #151e9d, #121982, #0e1467, #0a0e48, #06092d, #020312

## Harmonies

- Complementary: #eae166
- Analogous: #66b1ea, #a066ea
- Triadic: #ea666f, #6fea66
- Split-complementary: #eaa066, #b1ea66
- Tetradic: #ea66b1, #eae166, #66eaa0

## Colors that go with #666fea

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 #666fea: softer than #000 and cool enough to feel like part of the same palette. Seen in: Disney (https://brandsweets.com/colors/brands/disney-com), Docker (https://brandsweets.com/colors/brands/docker-com), Hinge (https://brandsweets.com/colors/brands/hinge-co), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com). — https://brandsweets.com/colors/charcoal
- **Sea Green** #2e8b57 [harmony, pool: triadic] — Sea Green completes a triad with #666fea — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Subaru (https://brandsweets.com/colors/brands/subaru-com), Next.js (https://brandsweets.com/colors/brands/nextjs-org), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Netflix (https://brandsweets.com/colors/brands/netflix). — https://brandsweets.com/colors/seagreen
- **Amber** #ffbf00 [pool] — Amber is paired with #666fea in 9 real palettes, including Mastodon hosted on mastodon.social's brand system and Google's brand system, as the accent. Seen in: Mastodon hosted on mastodon.social (https://brandsweets.com/colors/brands/mastodon-social), Google (https://brandsweets.com/colors/brands/google-com), Walmart (https://brandsweets.com/colors/brands/walmart-com), Wikipedia (https://brandsweets.com/colors/brands/wikipedia-org). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 13 real palettes, including Qualcomm's brand system and Penpot's brand system put Blue beside #666fea, as the accent. Seen in: Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Penpot (https://brandsweets.com/colors/brands/penpot-app), BBC (https://brandsweets.com/colors/brands/bbc-com), Cargo (https://brandsweets.com/colors/brands/cargo-site). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #666fea: 10 real palettes, including Carrefour's brand system and Behance's brand system, as the accent. Seen in: Carrefour (https://brandsweets.com/colors/brands/carrefour-com), Behance (https://brandsweets.com/colors/brands/behance-net), Nokia (https://brandsweets.com/colors/brands/nokia-com), Nivea (https://brandsweets.com/colors/brands/nivea-com). — https://brandsweets.com/colors/cobalt
- **Crimson** #dc143c [pool] — Crimson is paired with #666fea in 12 real palettes, including Marvel's brand system and Behance's brand system, as the accent. Seen in: Marvel (https://brandsweets.com/colors/brands/marvel-com), Behance (https://brandsweets.com/colors/brands/behance-net), Pizza Hut (https://brandsweets.com/colors/brands/pizzahut-com), Foot Locker (https://brandsweets.com/colors/brands/footlocker-com). — https://brandsweets.com/colors/crimson
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #666fea: 9 real palettes, including Calm's brand system and Elastic's brand system, as the lead colour. Seen in: Calm (https://brandsweets.com/colors/brands/calm-com), Elastic (https://brandsweets.com/colors/brands/elastic-co), Patreon (https://brandsweets.com/colors/brands/patreon-com), Astro (https://brandsweets.com/colors/brands/astro-build). — https://brandsweets.com/colors/deepskyblue
- **Denim** #1560bd [pool] — Designers have shipped Denim with #666fea: 14 real palettes, including Fivetran blue's brand system and Guinness's brand system, as the supporting colour. Seen in: Fivetran blue (https://brandsweets.com/colors/brands/fivetran-com), Guinness (https://brandsweets.com/colors/brands/guinness-com), Coursera (https://brandsweets.com/colors/brands/coursera-org), Motorola (https://brandsweets.com/colors/brands/motorola-com). — https://brandsweets.com/colors/denim

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

- On white (#ffffff): 4.18:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #5d67e9 (4.58:1); AA: background → #0f0f0f (4.59:1); AAA: text → #313ce3 (7.28:1)
- On black (#000000): 5.03:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #868dee (7.06:1)

## 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/666fea-9e9cc4-df8f4e-241f2d-e9eef1?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: "#666fea" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.