# #663a69

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

## Values

- Hex: `#663a69`
- RGB: rgb(102, 58, 105)
- HSL: hsl(296, 29%, 32%)
- OKLCH: oklch(0.421 0.092 324.7)
- Relative luminance: 0.0687
- Nearest named color: Plum (#66386a, Δ 0.581) — https://brandsweets.com/colors/plum-2
- Moods: cool, muted
- Page: https://brandsweets.com/colors/663a69

## Tints & shades

- Tints (toward white): #7c4780, #905194, #a361a8, #af75b3, #bc8cc0, #caa3cc, #d5b7d7, #e2cee4, #eee1ef, #fbf8fb
- Shades (toward black): #5d355f, #532f56, #4d2b4f, #432645, #39213b, #301b31, #261627, #201221, #160d17, #0d070d

## Harmonies

- Complementary: #3d693a
- Analogous: #4e3a69, #693a55
- Triadic: #69663a, #3a6966
- Split-complementary: #55693a, #3a694e
- Tetradic: #694e3a, #3d693a, #3a5569

## Colors that go with #663a69

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 #663a69: softer than #000 and cool enough to feel like part of the same palette. Seen in: Hinge (https://brandsweets.com/colors/brands/hinge-co), Tumblr (https://brandsweets.com/colors/brands/tumblr-com), Harbour (https://brandsweets.com/palettes/cool#harbour), Codecademy (https://brandsweets.com/colors/brands/codecademy-com). — https://brandsweets.com/colors/charcoal
- **Sea Green** #2e8b57 [harmony, pool: complementary] — Sea Green sits directly opposite #663a69 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Subaru (https://brandsweets.com/colors/brands/subaru-com). — https://brandsweets.com/colors/seagreen
- **Denim** #1560bd [pool] — Designers have shipped Denim with #663a69: 5 real palettes, including Hinge's brand system and HP's brand system, as the accent. Seen in: Hinge (https://brandsweets.com/colors/brands/hinge-co), HP (https://brandsweets.com/colors/brands/hp-com), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Starlink (https://brandsweets.com/colors/brands/starlink-com). — https://brandsweets.com/colors/denim
- **Powder Blue** #b0e0e6 [pool] — Designers have shipped Powder Blue with #663a69: 4 real palettes, including First Snow and Nursery, as the accent. Seen in: First Snow (https://brandsweets.com/palettes/cool#first-snow), Nursery (https://brandsweets.com/palettes/light#nursery), Macaron (https://brandsweets.com/palettes/light#macaron), Stone (https://brandsweets.com/palettes/neutral#stone). — https://brandsweets.com/colors/powderblue
- **Royal Blue** #4169e1 [pool] — Royal Blue is paired with #663a69 in 6 real palettes, including Console Light and Stripe's brand system, as the lead colour. Seen in: Console Light (https://brandsweets.com/palettes/technical#console-light), Stripe (https://brandsweets.com/colors/brands/stripe), Zoom (https://brandsweets.com/colors/brands/zoom-us), GitHub (https://brandsweets.com/colors/brands/github). — https://brandsweets.com/colors/royalblue
- **Taupe** #483c32 [pool] — Taupe is paired with #663a69 in 7 real palettes, including Blush and Dusk, as that palette's text colour. Seen in: Blush (https://brandsweets.com/palettes/light#blush), Dusk (https://brandsweets.com/palettes/cool#dusk), Sepia Mono (https://brandsweets.com/palettes/warm#sepia-mono), Datadog (https://brandsweets.com/colors/brands/datadoghq-com). — https://brandsweets.com/colors/taupe
- **Teal** #008080 [harmony, pool: split] — Teal is a split-complement of #663a69: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Stanley (https://brandsweets.com/colors/brands/stanley1913-com). — https://brandsweets.com/colors/teal
- **Crimson** #dc143c [pool] — Crimson is paired with #663a69 in 3 real palettes, including Lenovo's brand system and Wells Fargo's brand system, as the supporting colour. Seen in: Lenovo (https://brandsweets.com/colors/brands/lenovo-com), Wells Fargo (https://brandsweets.com/colors/brands/wellsfargo-com), Codecademy (https://brandsweets.com/colors/brands/codecademy-com). — https://brandsweets.com/colors/crimson

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

- On white (#ffffff): 8.85:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.37:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #a05ba4 (4.53:1); AA: background → #bababa (4.56:1); AAA: text → #b885bc (7.12:1); AAA: background → #e6e6e6 (7.09:1)

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/663a69-c19fbf-9ccb62-2d1f28-ede9f1?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: "#663a69" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.