# #21383f

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

## Values

- Hex: `#21383f`
- RGB: rgb(33, 56, 63)
- HSL: hsl(194, 31%, 19%)
- OKLCH: oklch(0.325 0.031 219.1)
- Relative luminance: 0.0351
- Nearest named color: Astral Nomad (#203943, Δ 0.694) — https://brandsweets.com/colors/astral-nomad
- Moods: cool, muted, dark, luxury, bold
- Page: https://brandsweets.com/colors/21383f

## Tints & shades

- Tints (toward white): #30505a, #3e6875, #4c8090, #5b97a9, #76a8b7, #8db7c3, #a8c8d1, #c3d9df, #deeaed, #f8fbfb
- Shades (toward black): #20353c, #1c3035, #1a2d32, #17272b, #152428, #121e21, #101b1e, #0c1517, #0b1214, #070c0d

## Harmonies

- Complementary: #3f2821
- Analogous: #213f37, #21293f
- Triadic: #3f2138, #383f21
- Split-complementary: #3f2129, #3f3721
- Tetradic: #37213f, #3f2821, #293f21

## Colors that go with #21383f

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

- **Dark Olive Green** #556b2f [harmony, pool: triadic] — Dark Olive Green completes a triad with #21383f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Olive Grove (https://brandsweets.com/palettes/muted#olive-grove), Undergrowth (https://brandsweets.com/palettes/dark#undergrowth), Oatmeal (https://brandsweets.com/palettes/neutral#oatmeal), 7-Eleven (https://brandsweets.com/colors/brands/7-eleven-com). — https://brandsweets.com/colors/darkolivegreen
- **Sienna** #a0522d [harmony, pool: complementary] — Sienna sits directly opposite #21383f 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), Harvest (https://brandsweets.com/palettes/warm#harvest), BrandSweets (https://brandsweets.com/colors/brands/brandsweets), Woodsmoke (https://brandsweets.com/palettes/dark#woodsmoke). — https://brandsweets.com/colors/sienna
- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #21383f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Astro (https://brandsweets.com/colors/brands/astro-build), Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Auth0 (https://brandsweets.com/colors/brands/auth0-com), Plaid (https://brandsweets.com/colors/brands/plaid-com). — https://brandsweets.com/colors/steelblue
- **Teal** #008080 [harmony, pool: analogous] — Teal is #21383f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: N26 (https://brandsweets.com/colors/brands/n26-com), Stanley (https://brandsweets.com/colors/brands/stanley1913-com), Mid-Century (https://brandsweets.com/palettes/warm#mid-century), Alpine (https://brandsweets.com/palettes/cool#alpine). — https://brandsweets.com/colors/teal
- **Amber** #ffbf00 [pool] — Amber is paired with #21383f in 8 real palettes, including Beach Hut and McDonald's's brand system, as the supporting colour. Seen in: Beach Hut (https://brandsweets.com/palettes/light#beach-hut), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Wikipedia (https://brandsweets.com/colors/brands/wikipedia-org), Google (https://brandsweets.com/colors/brands/google-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 14 real palettes, including Minecraft's brand system and Jeep's brand system put Blue beside #21383f, as the accent. Seen in: Minecraft (https://brandsweets.com/colors/brands/minecraft-net), Jeep (https://brandsweets.com/colors/brands/jeep-com), Headspace (https://brandsweets.com/colors/brands/headspace-com), Dunkin' (https://brandsweets.com/colors/brands/dunkindonuts-com). — https://brandsweets.com/colors/blue
- **Blush Pink** #e8b4b8 [pool] — 5 real palettes, including Rain Garden and Garden Wedding put Blush Pink beside #21383f, as the accent. Seen in: Rain Garden (https://brandsweets.com/palettes/cool#rain-garden), Garden Wedding (https://brandsweets.com/palettes/light#garden-wedding), Blush (https://brandsweets.com/palettes/light#blush), Nursery (https://brandsweets.com/palettes/light#nursery). — https://brandsweets.com/colors/blush-pink
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #21383f: 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): 12.34:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.7:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #4a7d8c (4.6:1); AA: background → #9e9e9e (4.61:1); AAA: text → #699fb0 (7.19:1); AAA: background → #c4c4c4 (7.07:1)

## Brands using this color

- **Boeing** — primary #253746 (Δ 1.551) — https://brandsweets.com/colors/brands/boeing-com
- **Audi** — primary #2c343f (Δ 1.933) — https://brandsweets.com/colors/brands/audi-com

## Fonts for this mood

- luxury: https://brandsweets.com/fonts/mood/luxury
- bold: https://brandsweets.com/fonts/mood/bold

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/21383f-9cb6c4-df4e72-1f242d-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: "#21383f" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.