# #644b71

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

## Values

- Hex: `#644b71`
- RGB: rgb(100, 75, 113)
- HSL: hsl(279, 20%, 37%)
- OKLCH: oklch(0.454 0.068 313.7)
- Relative luminance: 0.0893
- Nearest named color: Freshly Purpleized (#5c5083, Δ 3.159) — https://brandsweets.com/colors/freshly-purpleized
- Moods: cool, muted
- Page: https://brandsweets.com/colors/644b71

## Tints & shades

- Tints (toward white): #745884, #846496, #9375a3, #a288af, #b29dbe, #c1afca, #cfc2d6, #ddd4e2, #ece7ef, #faf9fb
- Shades (toward black): #5c4568, #513d5c, #493753, #413149, #392b40, #2e2334, #261d2b, #1e1622, #130e15, #0b080c

## Harmonies

- Complementary: #59714b
- Analogous: #514b71, #714b6c
- Triadic: #71644b, #4b7164
- Split-complementary: #6c714b, #4b7151
- Tetradic: #71514b, #59714b, #4b6c71

## Colors that go with #644b71

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

- **Sea Green** #2e8b57 [harmony, pool: complementary] — Sea Green sits directly opposite #644b71 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Subaru (https://brandsweets.com/colors/brands/subaru-com), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com). — https://brandsweets.com/colors/seagreen
- **Crimson** #dc143c [pool] — Crimson is paired with #644b71 in 4 real palettes, including Wells Fargo's brand system and Codecademy's brand system, as the lead colour. Seen in: Wells Fargo (https://brandsweets.com/colors/brands/wellsfargo-com), Codecademy (https://brandsweets.com/colors/brands/codecademy-com), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Lenovo (https://brandsweets.com/colors/brands/lenovo-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #644b71: 7 real palettes, including HP's brand system and Hinge's brand system, as the accent. Seen in: HP (https://brandsweets.com/colors/brands/hp-com), Hinge (https://brandsweets.com/colors/brands/hinge-co), The New York Times (https://brandsweets.com/colors/brands/nytimes-com), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com). — https://brandsweets.com/colors/denim
- **Medium Sea Green** #3cb371 [pool] — Medium Sea Green is paired with #644b71 in 4 real palettes, including Console Light and Fintech Trust, as the accent. Seen in: Console Light (https://brandsweets.com/palettes/technical#console-light), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Indigo SaaS (https://brandsweets.com/palettes/modern#indigo-saas), Undergrowth (https://brandsweets.com/palettes/dark#undergrowth). — https://brandsweets.com/colors/mediumseagreen
- **Midnight Blue** #191970 [pool] — 6 real palettes, including Lufthansa's brand system and First Snow put Midnight Blue beside #644b71, as the lead colour. Seen in: Lufthansa (https://brandsweets.com/colors/brands/lufthansa-com), First Snow (https://brandsweets.com/palettes/cool#first-snow), FIFA (https://brandsweets.com/colors/brands/fifa-com), Microsoft (https://brandsweets.com/colors/brands/microsoft-com). — https://brandsweets.com/colors/midnightblue
- **Royal Blue** #4169e1 [pool] — Royal Blue is paired with #644b71 in 7 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), GitHub (https://brandsweets.com/colors/brands/github), Subaru (https://brandsweets.com/colors/brands/subaru-com). — https://brandsweets.com/colors/royalblue
- **Sage Green** #9caf88 [pool] — Designers have shipped Sage Green with #644b71: 4 real palettes, including Darkroom and Oatmeal, as the supporting colour. Seen in: Darkroom (https://brandsweets.com/palettes/muted#darkroom), Oatmeal (https://brandsweets.com/palettes/neutral#oatmeal), Stone (https://brandsweets.com/palettes/neutral#stone), Graphite (https://brandsweets.com/palettes/technical#graphite). — https://brandsweets.com/colors/sage-green
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #644b71: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy. — https://brandsweets.com/colors/whitesmoke

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

- On white (#ffffff): 7.54:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.79:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #8a699b (4.57:1); AA: background → #c9c9c9 (4.55:1); AAA: text → #a68eb4 (7.15:1); AAA: background → #f7f7f7 (7.03:1)

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/644b71-b99fc1-b9cb62-2d1f2c-ebe9f1?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: "#644b71" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.