# #181d21

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

## Values

- Hex: `#181d21`
- RGB: rgb(24, 29, 33)
- HSL: hsl(207, 16%, 11%)
- OKLCH: oklch(0.227 0.011 242.2)
- Relative luminance: 0.0118
- Nearest named color: Coco’s Black (#1c1c1a, Δ 1.386) — https://brandsweets.com/colors/cocos-black
- Moods: cool, muted, dark, luxury, bold
- Page: https://brandsweets.com/colors/181d21

## Tints & shades

- Tints (toward white): #2b343b, #3c4953, #4f606d, #637788, #7a8e9f, #92a2b0, #acb9c3, #c7cfd6, #dee3e7, #f9fafb
- Shades (toward black): #151a1e, #151a1e, #13171b, #111518, #111518, #0f1215, #0d1012, #0b0d0f, #0b0d0f, #090a0c

## Harmonies

- Complementary: #211c18
- Analogous: #182120, #181821
- Triadic: #21181c, #1c2118
- Split-complementary: #211818, #212018
- Tetradic: #201821, #211c18, #182118

## Colors that go with #181d21

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 that reads cleanly against #181d21 without the hard edge of pure #000. Seen in: Audi (https://brandsweets.com/colors/brands/audi-com), Logitech (https://brandsweets.com/colors/brands/logitech-com), N26 (https://brandsweets.com/colors/brands/n26-com), Vimeo (https://brandsweets.com/colors/brands/vimeo-com). — https://brandsweets.com/colors/charcoal
- **Amber** #ffbf00 [pool] — Amber is paired with #181d21 in 18 real palettes, including Warner Bros.'s brand system and Google's brand system, as the accent. Seen in: Warner Bros. (https://brandsweets.com/colors/brands/warnerbros-com), Google (https://brandsweets.com/colors/brands/google-com), Wikipedia (https://brandsweets.com/colors/brands/wikipedia-org), Trailhead (https://brandsweets.com/palettes/warm#trailhead). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 23 real palettes, including Signal's brand system and CVS's brand system put Blue beside #181d21, as the supporting colour. Seen in: Signal (https://brandsweets.com/colors/brands/signal-org), CVS (https://brandsweets.com/colors/brands/cvs-com), Bumble (https://brandsweets.com/colors/brands/bumble-com), Rolex (https://brandsweets.com/colors/brands/rolex-com). — https://brandsweets.com/colors/blue
- **Blue Violet** #8a2be2 [pool] — Blue Violet is paired with #181d21 in 10 real palettes, including Yahoo's brand system and ClickUp's brand system, as the supporting colour. Seen in: Yahoo (https://brandsweets.com/colors/brands/yahoo-com), ClickUp (https://brandsweets.com/colors/brands/clickup-com), Prepare your taste buds... (https://brandsweets.com/colors/brands/grubhub-com), Klarna US (https://brandsweets.com/colors/brands/klarna-com). — https://brandsweets.com/colors/blueviolet
- **Blush Pink** #e8b4b8 [pool] — 5 real palettes, including Graphite Mono and Estate put Blush Pink beside #181d21, as the accent. Seen in: Graphite Mono (https://brandsweets.com/palettes/neutral#graphite-mono), Estate (https://brandsweets.com/palettes/luxury#estate), Cartier (https://brandsweets.com/colors/brands/cartier-com), Rain Garden (https://brandsweets.com/palettes/cool#rain-garden). — https://brandsweets.com/colors/blush-pink
- **Brown** #a52a2a [pool] — 5 real palettes, including Woodsmoke and State Farm's brand system put Brown beside #181d21, as the accent. Seen in: Woodsmoke (https://brandsweets.com/palettes/dark#woodsmoke), State Farm (https://brandsweets.com/colors/brands/statefarm-com), Typewriter (https://brandsweets.com/palettes/editorial#typewriter), Garnet (https://brandsweets.com/palettes/warm#garnet). — https://brandsweets.com/colors/brown
- **Burgundy** #800020 [pool] — 4 real palettes, including Qatar Airways's brand system and Mailchimp's brand system put Burgundy beside #181d21, as the accent. Seen in: Qatar Airways (https://brandsweets.com/colors/brands/qatarairways-com), Mailchimp (https://brandsweets.com/colors/brands/mailchimp-com), Candlelight (https://brandsweets.com/palettes/warm#candlelight), Rare Beauty (https://brandsweets.com/colors/brands/rarebeauty-com). — https://brandsweets.com/colors/burgundy
- **Burlywood** #deb887 [pool] — Burlywood is paired with #181d21 in 6 real palettes, including Coffee Bar and Kiln, as the accent. Seen in: Coffee Bar (https://brandsweets.com/palettes/dark#coffee-bar), Kiln (https://brandsweets.com/palettes/dark#kiln), Chalkboard (https://brandsweets.com/palettes/dark#chalkboard), Coastal (https://brandsweets.com/palettes/cool#coastal). — https://brandsweets.com/colors/burlywood

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

- On white (#ffffff): 16.98:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.24:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #637788 (4.52:1); AA: background → #858585 (4.6:1); AAA: text → #8698a7 (7.06:1); AAA: background → #a8a8a8 (7.14:1)

## Brands using this color

- **Fitbit** — primary #191c1d (Δ 0.747) — https://brandsweets.com/colors/brands/fitbit-com
- **Fitbit** — text #191c1d (Δ 0.747) — https://brandsweets.com/colors/brands/fitbit-com
- **Audi** — secondary #181d25 (Δ 0.796) — https://brandsweets.com/colors/brands/audi-com
- **WhatsApp** — primary #1c1e21 (Δ 0.838) — https://brandsweets.com/colors/brands/whatsapp-com
- **WhatsApp** — text #1c1e21 (Δ 0.838) — https://brandsweets.com/colors/brands/whatsapp-com
- **Brave** — primary #1c1c1d (Δ 0.952) — https://brandsweets.com/colors/brands/brave-com
- **Brave** — text #1c1c1d (Δ 0.952) — https://brandsweets.com/colors/brands/brave-com
- **Airtable** — accent #181d26 (Δ 0.996) — https://brandsweets.com/colors/brands/airtable-com
- **Nokia** — text #1d1e20 (Δ 1.03) — https://brandsweets.com/colors/brands/nokia-com
- **Box** — text #151f26 (Δ 1.059) — https://brandsweets.com/colors/brands/box-com
- **Spline** — text #191a1d (Δ 1.126) — https://brandsweets.com/colors/brands/spline-design
- **Logitech** — primary #1b1b1b (Δ 1.199) — https://brandsweets.com/colors/brands/logitech-com
- **Logitech** — text #1b1b1b (Δ 1.199) — https://brandsweets.com/colors/brands/logitech-com
- **N26** — text #1b1b1b (Δ 1.199) — https://brandsweets.com/colors/brands/n26-com
- **NASA** — text #1b1b1b (Δ 1.199) — https://brandsweets.com/colors/brands/nasa-gov
- **Signal** — primary #1b1b1b (Δ 1.199) — https://brandsweets.com/colors/brands/signal-org
- **Signal** — text #1b1b1b (Δ 1.199) — https://brandsweets.com/colors/brands/signal-org
- **Formula 1** — text #1c1c25 (Δ 1.231) — https://brandsweets.com/colors/brands/formula1-com
- **Netlify** — text #181a1c (Δ 1.236) — https://brandsweets.com/colors/brands/netlify-com
- **Figma** — text #1e1e1e (Δ 1.323) — https://brandsweets.com/colors/brands/figma
- **Vimeo** — text #141a20 (Δ 1.364) — https://brandsweets.com/colors/brands/vimeo-com
- **Gusto** — primary #1c1b1a (Δ 1.4) — https://brandsweets.com/colors/brands/gusto-com
- **Gusto** — text #1c1b1a (Δ 1.4) — https://brandsweets.com/colors/brands/gusto-com
- **Hinge** — text #1a1a1a (Δ 1.443) — https://brandsweets.com/colors/brands/hinge-co
- **Louis Vuitton** — primary #1a1a1a (Δ 1.443) — https://brandsweets.com/colors/brands/louisvuitton-com
- **Louis Vuitton** — text #1a1a1a (Δ 1.443) — https://brandsweets.com/colors/brands/louisvuitton-com
- **Spectrum** — primary #1a1a1a (Δ 1.443) — https://brandsweets.com/colors/brands/spectrum-com
- **Spectrum** — text #1a1a1a (Δ 1.443) — https://brandsweets.com/colors/brands/spectrum-com
- **Warner Bros.** — primary #1a1a1a (Δ 1.443) — https://brandsweets.com/colors/brands/warnerbros-com
- **Warner Bros.** — text #1a1a1a (Δ 1.443) — https://brandsweets.com/colors/brands/warnerbros-com
- **JetBrains** — text #19191c (Δ 1.482) — https://brandsweets.com/colors/brands/jetbrains-com
- **Asana** — secondary #151b26 (Δ 1.505) — https://brandsweets.com/colors/brands/asana-com
- **CVS** — primary #1a1a19 (Δ 1.579) — https://brandsweets.com/colors/brands/cvs-com
- **CVS** — text #1a1a19 (Δ 1.579) — https://brandsweets.com/colors/brands/cvs-com
- **GitLab** — text #1f1f1f (Δ 1.608) — https://brandsweets.com/colors/brands/gitlab
- **Google** — text #1f1f1f (Δ 1.608) — https://brandsweets.com/colors/brands/google-com
- **HubSpot** — text #1f1f1f (Δ 1.608) — https://brandsweets.com/colors/brands/hubspot-com
- **NFL** — accent #172029 (Δ 1.608) — https://brandsweets.com/colors/brands/nfl-com
- **Philips** — primary #15191e (Δ 1.608) — https://brandsweets.com/colors/brands/philips-com
- **Philips** — text #15191e (Δ 1.608) — https://brandsweets.com/colors/brands/philips-com
- **Revolut** — text #1f1f1f (Δ 1.608) — https://brandsweets.com/colors/brands/revolut-com
- **Yahoo** — primary #1a1919 (Δ 1.752) — https://brandsweets.com/colors/brands/yahoo-com
- **Yahoo** — text #1a1919 (Δ 1.752) — https://brandsweets.com/colors/brands/yahoo-com
- **Huawei** — text #191919 (Δ 1.763) — https://brandsweets.com/colors/brands/huawei-com
- **Notion** — primary #191919 (Δ 1.763) — https://brandsweets.com/colors/brands/notion
- **Puma** — primary #191919 (Δ 1.763) — https://brandsweets.com/colors/brands/puma-com
- **Puma** — text #191919 (Δ 1.763) — https://brandsweets.com/colors/brands/puma-com
- **Bumble** — primary #202020 (Δ 1.943) — https://brandsweets.com/colors/brands/bumble-com
- **Bumble** — text #202020 (Δ 1.943) — https://brandsweets.com/colors/brands/bumble-com
- **ClickUp** — text #202020 (Δ 1.943) — https://brandsweets.com/colors/brands/clickup-com
- **Lamborghini** — primary #202020 (Δ 1.943) — https://brandsweets.com/colors/brands/lamborghini-com
- **Lamborghini** — text #202020 (Δ 1.943) — https://brandsweets.com/colors/brands/lamborghini-com
- **Victoria's Secret** — primary #221d1d (Δ 1.949) — https://brandsweets.com/colors/brands/victoriassecret-com
- **Victoria's Secret** — text #221d1d (Δ 1.949) — https://brandsweets.com/colors/brands/victoriassecret-com
- **Apple** — primary #221e1f (Δ 1.953) — https://brandsweets.com/colors/brands/apple-com

## Curated palettes containing it

- **Ink & Paper** (minimal, editorial, clean) — #1b1b1b, #6e6e6e, #1e40af, #fcfbf7 — Two greys and one ink-blue link color: the palette of a well-set book page. — tool: https://brandsweets.com/palettes/new/1b1b1b-6e6e6e-1e40af-fcfbf7 — collection: https://brandsweets.com/palettes/minimal
- **Console Light** (technical, clean, light) — #2563eb, #52525b, #16a34a, #fafafa, #18181b — A sober docs palette: one blue for interactive, one green for success, zinc greys for everything else. — tool: https://brandsweets.com/palettes/new/2563eb-52525b-16a34a-fafafa-18181b — collection: https://brandsweets.com/palettes/technical
- **Graphite** (technical, muted, dark, modern) — #a1a1aa, #71717a, #f59e0b, #18181b, #f4f4f5 — A greyscale system with a single amber — the accent does all the work, so allow one per screen. — tool: https://brandsweets.com/palettes/new/a1a1aa-71717a-f59e0b-18181b-f4f4f5 — collection: https://brandsweets.com/palettes/technical
- **Fresh Juice** (playful, vivid, light) — #ff6b35, #ffd166, #06d6a0, #ffffff, #1f1f1f — Orange, mango and mint — a sugar rush; keep the type black so it stays legible under all that color. — tool: https://brandsweets.com/palettes/new/ff6b35-ffd166-06d6a0-ffffff-1f1f1f — collection: https://brandsweets.com/palettes/playful
- **Learning App** (playful, vivid, friendly) — #58cc02, #1cb0f6, #ff9600, #ffffff, #1c1c1c — Green, blue and orange at full saturation: the gamified-learning look, where every color is a reward. — tool: https://brandsweets.com/palettes/new/58cc02-1cb0f6-ff9600-ffffff-1c1c1c — collection: https://brandsweets.com/palettes/playful
- **Playground** (bold, playful, warm) — #ff8c00, #3b82f6, #22c55e, #fff8e7, #1d1d1d — Orange, blue and green — the colors of playground equipment; loud, cheerful, obviously for kids. — tool: https://brandsweets.com/palettes/new/ff8c00-3b82f6-22c55e-fff8e7-1d1d1d — collection: https://brandsweets.com/palettes/bold
- **Studio Grey** (minimal, muted, modern) — #1a1a1a, #8c8c8c, #3a86ff, #f2f2f2 — A pure greyscale with a single electric blue — the portfolio palette that makes work look considered. — tool: https://brandsweets.com/palettes/new/1a1a1a-8c8c8c-3a86ff-f2f2f2 — collection: https://brandsweets.com/palettes/minimal
- **Diner** (retro, vivid, playful, bold) — #e63946, #2a9d8f, #f4d35e, #fffdf5, #1d1d1b — Cherry red, mint-teal and butter yellow — chrome-and-vinyl retro; the red does the work, the teal cools it. — tool: https://brandsweets.com/palettes/new/e63946-2a9d8f-f4d35e-fffdf5-1d1d1b — collection: https://brandsweets.com/palettes/retro
- **Fireside** (winter, dark, warm, luxury) — #b23a3a, #2f5d50, #d4a857, #171a1f, #f2ede4 — Cranberry, pine and brass on a charcoal night — the holiday palette without the clichés, because the surface is cold. — tool: https://brandsweets.com/palettes/new/b23a3a-2f5d50-d4a857-171a1f-f2ede4 — collection: https://brandsweets.com/palettes/winter

## 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/181d21-9cadc4-df4e53-1f212d-e9f1f1?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: "#181d21" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.