# #866ca3

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

## Values

- Hex: `#866ca3`
- RGB: rgb(134, 108, 163)
- HSL: hsl(268, 23%, 53%)
- OKLCH: oklch(0.578 0.087 305.5)
- Relative luminance: 0.1844
- Nearest named color: Crown Jewels (#946dad, Δ 2.827) — https://brandsweets.com/colors/crown-jewels
- Moods: cool, muted
- Page: https://brandsweets.com/colors/866ca3

## Tints & shades

- Tints (toward white): #927bad, #9d88b4, #aa97be, #b4a4c6, #c1b4d0, #cbc0d8, #d8d0e2, #e3dce9, #efecf3, #faf9fb
- Shades (toward black): #795e97, #6c5487, #5f4b77, #534168, #49395b, #3c2f4b, #30253c, #231b2c, #17121c, #0a080d

## Harmonies

- Complementary: #89a36c
- Analogous: #6c6da3, #a16ca3
- Triadic: #a3856c, #6ca385
- Split-complementary: #a3a16c, #6da36c
- Tetradic: #a36c6d, #89a36c, #6ca3a1

## Colors that go with #866ca3

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 #866ca3: softer than #000 and cool enough to feel like part of the same palette. Seen in: Plaid (https://brandsweets.com/colors/brands/plaid-com), Campus (https://brandsweets.com/palettes/friendly#campus), Bloomberg (https://brandsweets.com/colors/brands/bloomberg-com), Hermès (https://brandsweets.com/colors/brands/hermes-com). — https://brandsweets.com/colors/charcoal
- **Denim** #1560bd [pool] — Designers have shipped Denim with #866ca3: 4 real palettes, including Campus and The New York Times's brand system, as the lead colour. Seen in: Campus (https://brandsweets.com/palettes/friendly#campus), The New York Times (https://brandsweets.com/colors/brands/nytimes-com), American Express (https://brandsweets.com/colors/brands/americanexpress-com), Discover (https://brandsweets.com/colors/brands/discover-com). — https://brandsweets.com/colors/denim
- **Midnight Blue** #191970 [pool] — 6 real palettes, including Plaid's brand system and Marvel's brand system put Midnight Blue beside #866ca3, as the supporting colour. Seen in: Plaid (https://brandsweets.com/colors/brands/plaid-com), Marvel (https://brandsweets.com/colors/brands/marvel-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Lufthansa (https://brandsweets.com/colors/brands/lufthansa-com). — https://brandsweets.com/colors/midnightblue
- **Taupe** #483c32 [pool] — Taupe is paired with #866ca3 in 10 real palettes, including Graphite Mono and Greige, as the lead colour. Seen in: Graphite Mono (https://brandsweets.com/palettes/neutral#graphite-mono), Greige (https://brandsweets.com/palettes/neutral#greige), Typewriter (https://brandsweets.com/palettes/editorial#typewriter), Superhuman (https://brandsweets.com/colors/brands/superhuman-com). — https://brandsweets.com/colors/taupe
- **Olive Green** #808000 [harmony: complementary] — Olive Green sits directly opposite #866ca3 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
- **Sea Green** #2e8b57 [harmony, pool: split] — Sea Green is a split-complement of #866ca3: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Next.js (https://brandsweets.com/colors/brands/nextjs-org), Mushroom (https://brandsweets.com/palettes/neutral#mushroom). — https://brandsweets.com/colors/seagreen
- **Copper** #b87333 [harmony, pool: triadic] — Copper completes a triad with #866ca3 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Atelier (https://brandsweets.com/palettes/elegant#atelier), Dusk (https://brandsweets.com/palettes/cool#dusk). — https://brandsweets.com/colors/copper
- **Rust** #b7410e [pool] — Rust shows up next to #866ca3 in 3 real palettes, including Semrush's brand system and Gallery, as the accent. Seen in: Semrush (https://brandsweets.com/colors/brands/semrush-com), Gallery (https://brandsweets.com/palettes/editorial#gallery), Noir Beauty (https://brandsweets.com/palettes/dark#noir-beauty). — https://brandsweets.com/colors/rust

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

- On white (#ffffff): 4.48:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #8368a1 (4.71:1); AA: background → #050505 (4.55:1); AAA: text → #644f7d (7.1:1)
- On black (#000000): 4.69:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #a28eb8 (7.1:1)

## Brands using this color

- **Semrush** — secondary #8467aa (Δ 1.985) — https://brandsweets.com/colors/brands/semrush-com

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/866ca3-b39cc4-dfdc4e-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: "#866ca3" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.