# #181221

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

## Values

- Hex: `#181221`
- RGB: rgb(24, 18, 33)
- HSL: hsl(264, 29%, 10%)
- OKLCH: oklch(0.197 0.031 302.1)
- Relative luminance: 0.0074
- Nearest named color: Back in Black (#16141c, Δ 1.471) — https://brandsweets.com/colors/back-in-black
- Moods: cool, muted, dark, luxury, bold
- Page: https://brandsweets.com/colors/181221

## Tints & shades

- Tints (toward white): #2e223f, #43335c, #564176, #6c5194, #8368ac, #9b85bc, #b3a3cc, #c9bddb, #e1dbeb, #faf8fb
- Shades (toward black): #16101e, #16101e, #130e1a, #130e1a, #110d17, #0e0b14, #0e0b14, #0c0910, #0c0910, #0a070d

## Harmonies

- Complementary: #1b2112
- Analogous: #121421, #1f1221
- Triadic: #211812, #122118
- Split-complementary: #211f12, #142112
- Tetradic: #211214, #1b2112, #12211f

## Colors that go with #181221

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 #181221: softer than #000 and cool enough to feel like part of the same palette. Seen in: PlayStation® Official Site: Consoles, Games, Accessories & MoreSony Interactive Entertainment (https://brandsweets.com/colors/brands/playstation-com), Vimeo (https://brandsweets.com/colors/brands/vimeo-com), Asana (https://brandsweets.com/colors/brands/asana-com), Puma (https://brandsweets.com/colors/brands/puma-com). — https://brandsweets.com/colors/charcoal
- **Dark Olive Green** #556b2f [harmony, pool: complementary] — Dark Olive Green sits directly opposite #181221 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Warp (https://brandsweets.com/colors/brands/warp-dev), Cohere (https://brandsweets.com/colors/brands/cohere-com), Miro (https://brandsweets.com/colors/brands/miro-com), Magazine Ochre (https://brandsweets.com/palettes/editorial#magazine-ochre). — https://brandsweets.com/colors/darkolivegreen
- **Sea Green** #2e8b57 [harmony, pool: split] — Sea Green is a split-complement of #181221: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), Asana (https://brandsweets.com/colors/brands/asana-com), Next.js (https://brandsweets.com/colors/brands/nextjs-org), Kia (https://brandsweets.com/colors/brands/kia-com). — https://brandsweets.com/colors/seagreen
- **Sienna** #a0522d [harmony, pool: triadic] — Sienna completes a triad with #181221 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Oatly (https://brandsweets.com/colors/brands/oatly-com), Coffee Bar (https://brandsweets.com/palettes/dark#coffee-bar), Woodsmoke (https://brandsweets.com/palettes/dark#woodsmoke), BrandSweets (https://brandsweets.com/colors/brands/brandsweets). — https://brandsweets.com/colors/sienna
- **Slate Blue** #6a5acd [harmony, pool: analogous] — Slate Blue is #181221's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Sentry (https://brandsweets.com/colors/brands/sentry-io), Indigo SaaS (https://brandsweets.com/palettes/modern#indigo-saas), Calm (https://brandsweets.com/colors/brands/calm-com), Marvel (https://brandsweets.com/colors/brands/marvel-com). — https://brandsweets.com/colors/slateblue
- **Teal** #008080 [harmony, pool: triadic] — Teal completes a triad with #181221 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Sapphire & Gold (https://brandsweets.com/palettes/luxury#sapphire-and-gold), Clinic (https://brandsweets.com/palettes/clean#clinic), Redfin (https://brandsweets.com/colors/brands/redfin-com), Gemstone (https://brandsweets.com/palettes/vivid#gemstone). — https://brandsweets.com/colors/teal
- **Amber** #ffbf00 [pool] — Amber is paired with #181221 in 18 real palettes, including Lemon Squeezy's brand system and Blueprint, as the lead colour. Seen in: Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), Blueprint (https://brandsweets.com/palettes/technical#blueprint), Southwest Airlines (https://brandsweets.com/colors/brands/southwest-com), Ahrefs (https://brandsweets.com/colors/brands/ahrefs-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 23 real palettes, including Warp's brand system and League of Legends's brand system put Blue beside #181221, as the supporting colour. Seen in: Warp (https://brandsweets.com/colors/brands/warp-dev), League of Legends (https://brandsweets.com/colors/brands/leagueoflegends-com), Monzo (https://brandsweets.com/colors/brands/monzo-com), MongoDB (https://brandsweets.com/colors/brands/mongodb-com). — https://brandsweets.com/colors/blue

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

- On white (#ffffff): 18.3:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.15:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #8368ac (4.54:1); AA: background → #808080 (4.63:1); AAA: text → #a18cc0 (7.03:1); AAA: background → #a1a1a1 (7.08:1)

## Brands using this color

- **Warp** — text #1a1522 (Δ 1.158) — https://brandsweets.com/colors/brands/warp-dev
- **Sentry** — text #150f23 (Δ 1.421) — https://brandsweets.com/colors/brands/sentry-io
- **Railway** — text #13111c (Δ 1.506) — https://brandsweets.com/colors/brands/railway-app
- **Cohere** — secondary #14142a (Δ 1.914) — https://brandsweets.com/colors/brands/cohere-com

## Curated palettes containing it

- **Sunset Boulevard** (warm, vivid, bold, dark) — #ff6f61, #ffb347, #c9518b, #1a0f1f, #fff3e0 — Coral, apricot and magenta on aubergine — the gradient sunset every event brand wants, decomposed into flat tokens. — tool: https://brandsweets.com/palettes/new/ff6f61-ffb347-c9518b-1a0f1f-fff3e0 — collection: https://brandsweets.com/palettes/warm

## 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/181221-b19cc4-dfd34e-2b1f2d-e9eaf1?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: "#181221" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.