# #428f6e

A color — neutral. Deterministic analysis from BrandSweets (no inference).

## Values

- Hex: `#428f6e`
- RGB: rgb(66, 143, 110)
- HSL: hsl(154, 37%, 41%)
- OKLCH: oklch(0.592 0.093 163.2)
- Relative luminance: 0.2193
- Nearest named color: Illuminati Green (#419168, Δ 1.225) — https://brandsweets.com/colors/illuminati-green
- Moods: neutral
- Page: https://brandsweets.com/colors/428f6e

## Tints & shades

- Tints (toward white): #4ca47e, #57b28b, #6cbc99, #81c5a8, #96cfb6, #a8d7c2, #bde0d1, #d2eadf, #e3f2ec, #f8fcfa
- Shades (toward black): #3b8163, #37775b, #306950, #2a5b46, #25503e, #1f4233, #183428, #12261d, #0d1c15, #060e0b

## Harmonies

- Complementary: #8f4263
- Analogous: #428f47, #428a8f
- Triadic: #6e428f, #8f6e42
- Split-complementary: #8f428a, #8f4742
- Tetradic: #47428f, #8f4263, #8a8f42

## Colors that go with #428f6e

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 #428f6e: softer than #000 and cool enough to feel like part of the same palette. Seen in: Tide Pool (https://brandsweets.com/palettes/cool#tide-pool), Asana (https://brandsweets.com/colors/brands/asana-com), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Coastal (https://brandsweets.com/palettes/cool#coastal). — https://brandsweets.com/colors/charcoal
- **Copper** #b87333 [harmony, pool: triadic] — Copper completes a triad with #428f6e — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Wellness (https://brandsweets.com/palettes/warm#wellness), Riverbed (https://brandsweets.com/palettes/muted#riverbed), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty), Clay & Linen (https://brandsweets.com/palettes/warm#clay-and-linen). — https://brandsweets.com/colors/copper
- **Medium Violet Red** #c71585 [harmony, pool: complementary] — Medium Violet Red sits directly opposite #428f6e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Bun (https://brandsweets.com/colors/brands/bun-sh). — https://brandsweets.com/colors/mediumvioletred
- **Crimson** #dc143c [pool] — Crimson is paired with #428f6e in 8 real palettes, including Five Guys's brand system and Netflix's brand system, as the supporting colour. Seen in: Five Guys (https://brandsweets.com/colors/brands/fiveguys-com), Netflix (https://brandsweets.com/colors/brands/netflix), Diner (https://brandsweets.com/palettes/vivid#diner), Coinbase (https://brandsweets.com/colors/brands/coinbase). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #428f6e: 7 real palettes, including Peacock and Intel's brand system, as the supporting colour. Seen in: Peacock (https://brandsweets.com/palettes/vivid#peacock), Intel (https://brandsweets.com/colors/brands/intel-com), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Netflix (https://brandsweets.com/colors/brands/netflix). — https://brandsweets.com/colors/denim
- **Goldenrod** #daa520 [pool] — Goldenrod shows up next to #428f6e in 4 real palettes, including Noir Beauty and Mid-Century, as the lead colour. Seen in: Noir Beauty (https://brandsweets.com/palettes/dark#noir-beauty), Mid-Century (https://brandsweets.com/palettes/warm#mid-century), Ledger Dark (https://brandsweets.com/palettes/dark#ledger-dark), Sapphire & Gold (https://brandsweets.com/palettes/luxury#sapphire-and-gold). — https://brandsweets.com/colors/goldenrod
- **Midnight Blue** #191970 [pool] — 5 real palettes, including Tide Pool and Paramount+'s brand system put Midnight Blue beside #428f6e, as that palette's text colour. Seen in: Tide Pool (https://brandsweets.com/palettes/cool#tide-pool), Paramount+ (https://brandsweets.com/colors/brands/paramountplus-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Telehealth (https://brandsweets.com/palettes/modern#telehealth). — https://brandsweets.com/colors/midnightblue
- **Orange** #ffa500 [pool] — 5 real palettes, including Farmers Market and Olympics's brand system put Orange beside #428f6e, as the accent. Seen in: Farmers Market (https://brandsweets.com/palettes/warm#farmers-market), Olympics (https://brandsweets.com/colors/brands/olympics-com), Graphite (https://brandsweets.com/palettes/technical#graphite), Campus (https://brandsweets.com/palettes/friendly#campus). — https://brandsweets.com/colors/orange

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

- On white (#ffffff): 3.9:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #3b8163 (4.66:1); AA: background → #171717 (4.6:1); AAA: text → #2d624b (7.09:1)
- On black (#000000): 5.39:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #4da880 (7.23:1)

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/428f6e-a2beb5-d459ca-1f2d2d-e9f1ea?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: "#428f6e" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.