# #21454f

A color — cool, dark, luxury, bold, modern. Deterministic analysis from BrandSweets (no inference).

## Values

- Hex: `#21454f`
- RGB: rgb(33, 69, 79)
- HSL: hsl(193, 41%, 22%)
- OKLCH: oklch(0.368 0.045 218.1)
- Relative luminance: 0.0514
- Nearest named color: Cold and Dark (#154250, Δ 1.617) — https://brandsweets.com/colors/cold-and-dark
- Moods: cool, dark, luxury, bold, modern
- Page: https://brandsweets.com/colors/21454f

## Tints & shades

- Tints (toward white): #2d5e6c, #387485, #448da2, #52a1b7, #6fb1c3, #8cc0cf, #a5ced9, #c2dee5, #dbebf0, #f8fbfc
- Shades (toward black): #1e3f48, #1b3941, #1a353d, #172f36, #14292f, #112328, #0e1c20, #0c191d, #091316, #060d0e

## Harmonies

- Complementary: #4f2b21
- Analogous: #214f42, #212e4f
- Triadic: #4f2145, #454f21
- Split-complementary: #4f212e, #4f4221
- Tetradic: #42214f, #4f2b21, #2e4f21

## Colors that go with #21454f

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

- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #21454f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Auth0 (https://brandsweets.com/colors/brands/auth0-com), Plaid (https://brandsweets.com/colors/brands/plaid-com), Astro (https://brandsweets.com/colors/brands/astro-build), Beach Hut (https://brandsweets.com/palettes/light#beach-hut). — https://brandsweets.com/colors/steelblue
- **Teal** #008080 [harmony, pool: analogous] — Teal is #21454f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Stanley (https://brandsweets.com/colors/brands/stanley1913-com), Gusto (https://brandsweets.com/colors/brands/gusto-com), N26 (https://brandsweets.com/colors/brands/n26-com), Mid-Century (https://brandsweets.com/palettes/warm#mid-century). — https://brandsweets.com/colors/teal
- **Sienna** #a0522d [harmony, pool: complementary] — Sienna sits directly opposite #21454f on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Olive Grove (https://brandsweets.com/palettes/muted#olive-grove). — https://brandsweets.com/colors/sienna
- **Blue** #0000ff [pool] — 10 real palettes, including Jeep's brand system and Alaska Airlines's brand system put Blue beside #21454f, as the accent. Seen in: Jeep (https://brandsweets.com/colors/brands/jeep-com), Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com), Dunkin' (https://brandsweets.com/colors/brands/dunkindonuts-com), Minecraft (https://brandsweets.com/colors/brands/minecraft-net). — https://brandsweets.com/colors/blue
- **Blush Pink** #e8b4b8 [pool] — 4 real palettes, including Garden Wedding and Nursery put Blush Pink beside #21454f, as the supporting colour. Seen in: Garden Wedding (https://brandsweets.com/palettes/light#garden-wedding), Nursery (https://brandsweets.com/palettes/light#nursery), Rain Garden (https://brandsweets.com/palettes/cool#rain-garden), Blush (https://brandsweets.com/palettes/light#blush). — https://brandsweets.com/colors/blush-pink
- **Cadet Blue** #5f9ea0 [pool] — Designers have shipped Cadet Blue with #21454f: 5 real palettes, including Paper & Pine and Clean Beauty, as the supporting colour. Seen in: Paper & Pine (https://brandsweets.com/palettes/minimal#paper-and-pine), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty), Coastal (https://brandsweets.com/palettes/cool#coastal), Open House (https://brandsweets.com/palettes/clean#open-house). — https://brandsweets.com/colors/cadetblue
- **Copper** #b87333 [pool] — Designers have shipped Copper with #21454f: 7 real palettes, including Notion's brand system and Clean Beauty. Seen in: Notion (https://brandsweets.com/colors/brands/notion), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty), Desert Road (https://brandsweets.com/palettes/warm#desert-road), Bakery (https://brandsweets.com/palettes/warm#bakery). — https://brandsweets.com/colors/copper
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #21454f: 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): 10.35:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.03:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #3c7e90 (4.58:1); AA: background → #ababab (4.51:1); AAA: text → #52a1b7 (7.14:1); AAA: background → #d6d6d6 (7.12:1)

## Brands using this color

- **Codecademy** — primary #1c4454 (Δ 1.115) — https://brandsweets.com/colors/brands/codecademy-com
- **IHG** — accent #1f4456 (Δ 1.379) — https://brandsweets.com/colors/brands/ihg-com
- **Zendesk** — accent #17494d (Δ 1.646) — https://brandsweets.com/colors/brands/zendesk-com
- **HubSpot** — primary #124548 (Δ 1.896) — https://brandsweets.com/colors/brands/hubspot-com
- **HubSpot** — accent #124548 (Δ 1.896) — https://brandsweets.com/colors/brands/hubspot-com
- **Disney** — secondary #054553 (Δ 1.911) — https://brandsweets.com/colors/brands/disney-com

## Fonts for this mood

- luxury: https://brandsweets.com/fonts/mood/luxury
- bold: https://brandsweets.com/fonts/mood/bold
- 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/21454f-a2b5be-df4e75-1f242d-e9f1ef?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: "#21454f" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.