# #031b19

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

## Values

- Hex: `#031b19`
- RGB: rgb(3, 27, 25)
- HSL: hsl(175, 80%, 6%)
- OKLCH: oklch(0.202 0.031 187.6)
- Relative luminance: 0.0087
- Nearest named color: Black Stallion (#0e191c, Δ 1.84) — https://brandsweets.com/colors/black-stallion
- Moods: vivid, dark, luxury, bold
- Page: https://brandsweets.com/colors/031b19

## Tints & shades

- Tints (toward white): #084540, #0c6e66, #119c91, #16c5b7, #23e7d6, #4cebde, #75f0e5, #a3f5ee, #cdf9f6, #f6fefd
- Shades (toward black): #031c19, #031c19, #031715, #031715, #031715, #031715, #031715, #021211, #021211, #021211

## Harmonies

- Complementary: #1c0305
- Analogous: #031c0d, #03111c
- Triadic: #1a031c, #1c1903
- Split-complementary: #1c0311, #1c0d03
- Tetradic: #0d031c, #1c0305, #111c03

## Colors that go with #031b19

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 #031b19: softer than #000 and cool enough to feel like part of the same palette. Seen in: Sweetgreen (https://brandsweets.com/colors/brands/sweetgreen-com), Vimeo (https://brandsweets.com/colors/brands/vimeo-com), Puma (https://brandsweets.com/colors/brands/puma-com), Hinge (https://brandsweets.com/colors/brands/hinge-co). — https://brandsweets.com/colors/charcoal
- **Crimson** #dc143c [harmony, pool: complementary] — Crimson sits directly opposite #031b19 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Chase (https://brandsweets.com/colors/brands/chase-com), Wells Fargo (https://brandsweets.com/colors/brands/wellsfargo-com), Huawei (https://brandsweets.com/colors/brands/huawei-com), Foot Locker (https://brandsweets.com/colors/brands/footlocker-com). — https://brandsweets.com/colors/crimson
- **Rust** #b7410e [harmony, pool: split] — Rust is a split-complement of #031b19: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Gallery (https://brandsweets.com/palettes/editorial#gallery), Semrush (https://brandsweets.com/colors/brands/semrush-com), Wayfair (https://brandsweets.com/colors/brands/wayfair-com), Magazine Ochre (https://brandsweets.com/palettes/editorial#magazine-ochre). — https://brandsweets.com/colors/rust
- **Sea Green** #2e8b57 [harmony, pool: analogous] — Sea Green is #031b19's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Next.js (https://brandsweets.com/colors/brands/nextjs-org), Kia (https://brandsweets.com/colors/brands/kia-com), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), Asana (https://brandsweets.com/colors/brands/asana-com). — https://brandsweets.com/colors/seagreen
- **Sienna** #a0522d [harmony, pool: triadic] — Sienna completes a triad with #031b19 — 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
- **Teal** #008080 [harmony, pool: analogous] — Teal is #031b19's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Perplexity (https://brandsweets.com/colors/brands/perplexity), N26 (https://brandsweets.com/colors/brands/n26-com), Gusto (https://brandsweets.com/colors/brands/gusto-com), Redfin (https://brandsweets.com/colors/brands/redfin-com). — https://brandsweets.com/colors/teal
- **Amber** #ffbf00 [pool] — Amber is paired with #031b19 in 18 real palettes, including Warner Bros.'s brand system and Lemon Squeezy's brand system, as the accent. Seen in: Warner Bros. (https://brandsweets.com/colors/brands/warnerbros-com), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), 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
- **Blue** #0000ff [pool] — 24 real palettes, including MongoDB's brand system and Monzo's brand system put Blue beside #031b19, as the accent. Seen in: MongoDB (https://brandsweets.com/colors/brands/mongodb-com), Monzo (https://brandsweets.com/colors/brands/monzo-com), Kia (https://brandsweets.com/colors/brands/kia-com), CVS (https://brandsweets.com/colors/brands/cvs-com). — https://brandsweets.com/colors/blue

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

- On white (#ffffff): 17.88:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.17:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #0f857b (4.66:1); AA: background → #808080 (4.53:1); AAA: text → #13aa9d (7.26:1); AAA: background → #a3a3a3 (7.09:1)

## Brands using this color

- **Perplexity** — text #091717 (Δ 1.578) — https://brandsweets.com/colors/brands/perplexity

## 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/031b19-a2bdbe-d4599f-1f282d-e9f1ed?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: "#031b19" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.