# #210b03

A color — warm, vivid, dark, playful, bold, luxury. Deterministic analysis from BrandSweets (no inference).

## Values

- Hex: `#210b03`
- RGB: rgb(33, 11, 3)
- HSL: hsl(16, 83%, 7%)
- OKLCH: oklch(0.183 0.042 44.3)
- Relative luminance: 0.0057
- Nearest named color: Italian Roast (#221111, Δ 2.769) — https://brandsweets.com/colors/italian-roast
- Moods: warm, vivid, dark, playful, bold, luxury
- Page: https://brandsweets.com/colors/210b03

## Tints & shades

- Tints (toward white): #4b1907, #75270b, #9f350f, #c94313, #eb5924, #ef794e, #f29878, #f6b8a2, #fad8cc, #fef8f6
- Shades (toward black): #210b03, #1c0903, #1c0903, #1c0903, #1c0903, #170802, #170802, #170802, #130602, #130602

## Harmonies

- Complementary: #031921
- Analogous: #21030a, #211a03
- Triadic: #03210b, #0b0321
- Split-complementary: #03211a, #030a21
- Tetradic: #0a2103, #031921, #1a0321

## Colors that go with #210b03

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 body-text near-black for #210b03: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. Seen in: PlayStation® Official Site: Consoles, Games, Accessories & MoreSony Interactive Entertainment (https://brandsweets.com/colors/brands/playstation-com), Bloomberg (https://brandsweets.com/colors/brands/bloomberg-com), Codecademy (https://brandsweets.com/colors/brands/codecademy-com), dbt Labs (https://brandsweets.com/colors/brands/getdbt-com). — https://brandsweets.com/colors/charcoal
- **Crimson** #dc143c [harmony, pool: analogous] — Crimson is #210b03's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Behance (https://brandsweets.com/colors/brands/behance-net), Budweiser (https://brandsweets.com/colors/brands/budweiser-com), Cartier (https://brandsweets.com/colors/brands/cartier-com), Casper Sleep (https://brandsweets.com/colors/brands/casper-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [harmony, pool: split] — Denim is a split-complement of #210b03: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Warbyparker (https://brandsweets.com/colors/brands/warbyparker-com), American Express (https://brandsweets.com/colors/brands/americanexpress-com), Apple (https://brandsweets.com/colors/brands/apple-com), Coursera (https://brandsweets.com/colors/brands/coursera-org). — https://brandsweets.com/colors/denim
- **Sea Green** #2e8b57 [harmony, pool: triadic] — Sea Green completes a triad with #210b03 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Next.js (https://brandsweets.com/colors/brands/nextjs-org), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), Asana (https://brandsweets.com/colors/brands/asana-com), Coinbase (https://brandsweets.com/colors/brands/coinbase). — https://brandsweets.com/colors/seagreen
- **Sienna** #a0522d [harmony, pool: analogous] — Sienna is #210b03's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Coffee Bar (https://brandsweets.com/palettes/dark#coffee-bar), Oatly (https://brandsweets.com/colors/brands/oatly-com), Woodsmoke (https://brandsweets.com/palettes/dark#woodsmoke), BrandSweets (https://brandsweets.com/colors/brands/brandsweets). — https://brandsweets.com/colors/sienna
- **Slate Blue** #6a5acd [harmony, pool: triadic] — Slate Blue completes a triad with #210b03 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Calm (https://brandsweets.com/colors/brands/calm-com), Marvel (https://brandsweets.com/colors/brands/marvel-com), Linear (https://brandsweets.com/colors/brands/linear), Sentry (https://brandsweets.com/colors/brands/sentry-io). — https://brandsweets.com/colors/slateblue
- **Teal** #008080 [harmony, pool: complementary] — Teal sits directly opposite #210b03 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Redfin (https://brandsweets.com/colors/brands/redfin-com), Magazine Ochre (https://brandsweets.com/palettes/editorial#magazine-ochre), Gusto (https://brandsweets.com/colors/brands/gusto-com), Saffron (https://brandsweets.com/palettes/warm#saffron). — https://brandsweets.com/colors/teal
- **Amber** #ffbf00 [pool] — Amber is paired with #210b03 in 17 real palettes, including Heatwave and Ember, as the supporting colour. Seen in: Heatwave (https://brandsweets.com/palettes/warm#heatwave), Ember (https://brandsweets.com/palettes/bold#ember), Ahrefs (https://brandsweets.com/colors/brands/ahrefs-com), Mastodon hosted on mastodon.social (https://brandsweets.com/colors/brands/mastodon-social). — https://brandsweets.com/colors/amber

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

- On white (#ffffff): 18.85:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.11:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #d24614 (4.63:1); AA: background → #7d7d7d (4.58:1); AAA: text → #ee7144 (7.08:1); AAA: background → #9e9e9e (7.04:1)

## Fonts for this mood

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

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/210b03-c4ab9c-62cbb4-2d291f-f1e9eb?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: "#210b03" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.