# #04031b

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

## Values

- Hex: `#04031b`
- RGB: rgb(4, 3, 27)
- HSL: hsl(243, 80%, 6%)
- OKLCH: oklch(0.124 0.055 278)
- Relative luminance: 0.0017
- Nearest named color: Obsidian Shard (#060313, Δ 1.921) — https://brandsweets.com/colors/obsidian-shard
- Moods: cool, vivid, dark, technical, modern, luxury, bold
- Page: https://brandsweets.com/colors/04031b

## Tints & shades

- Tints (toward white): #0b0845, #110c6e, #18119c, #1f16c5, #2c23e7, #544ceb, #7b75f0, #a7a3f5, #cfcdf9, #f6f6fe
- Shades (toward black): #04031c, #04031c, #040317, #040317, #040317, #040317, #040317, #030212, #030212, #030212

## Harmonies

- Complementary: #1a1c03
- Analogous: #030e1c, #11031c
- Triadic: #1c0403, #031c04
- Split-complementary: #1c1103, #0e1c03
- Tetradic: #1c030e, #1a1c03, #031c11

## Colors that go with #04031b

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 #04031b: softer than #000 and cool enough to feel like part of the same palette. Seen in: Asana (https://brandsweets.com/colors/brands/asana-com), Amazon (https://brandsweets.com/colors/brands/amazon-com), Bloomberg (https://brandsweets.com/colors/brands/bloomberg-com), Codecademy (https://brandsweets.com/colors/brands/codecademy-com). — https://brandsweets.com/colors/charcoal
- **Sea Green** #2e8b57 [harmony, pool: triadic] — Sea Green completes a triad with #04031b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Intel (https://brandsweets.com/colors/brands/intel-com), Coinbase (https://brandsweets.com/colors/brands/coinbase), Asana (https://brandsweets.com/colors/brands/asana-com), Kia (https://brandsweets.com/colors/brands/kia-com). — https://brandsweets.com/colors/seagreen
- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #04031b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Olympics (https://brandsweets.com/colors/brands/olympics-com), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), American Express (https://brandsweets.com/colors/brands/americanexpress-com), Plaid (https://brandsweets.com/colors/brands/plaid-com). — https://brandsweets.com/colors/steelblue
- **Amber** #ffbf00 [pool] — Amber is paired with #04031b in 13 real palettes, including Southwest Airlines's brand system and Lemon Squeezy's brand system, as the accent. Seen in: Southwest Airlines (https://brandsweets.com/colors/brands/southwest-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] — 16 real palettes, including Glossier's brand system and Uber's brand system put Blue beside #04031b, as the accent. Seen in: Glossier (https://brandsweets.com/colors/brands/glossier-com), Uber (https://brandsweets.com/colors/brands/uber-com), Pfizer (https://brandsweets.com/colors/brands/pfizer-com), Kia (https://brandsweets.com/colors/brands/kia-com). — https://brandsweets.com/colors/blue
- **Blue Violet** #8a2be2 [pool] — Blue Violet is paired with #04031b in 9 real palettes, including Gemstone and Circuit, as the supporting colour. Seen in: Gemstone (https://brandsweets.com/palettes/vivid#gemstone), Circuit (https://brandsweets.com/palettes/technical#circuit), Twitch (https://brandsweets.com/colors/brands/twitch-tv), Render (https://brandsweets.com/colors/brands/render-com). — https://brandsweets.com/colors/blueviolet
- **Champagne** #f7e7ce [pool] — 5 real palettes, including Midnight Luxe and Allbirds's brand system put Champagne beside #04031b, as the text colour against it. Seen in: Midnight Luxe (https://brandsweets.com/palettes/luxury#midnight-luxe), Allbirds (https://brandsweets.com/colors/brands/allbirds-com), Sweetgreen (https://brandsweets.com/colors/brands/sweetgreen-com), Bramble (https://brandsweets.com/palettes/muted#bramble). — https://brandsweets.com/colors/champagne
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #04031b: 15 real palettes, including Intel's brand system and Oreo's brand system, as the lead colour. Seen in: Intel (https://brandsweets.com/colors/brands/intel-com), Oreo (https://brandsweets.com/colors/brands/oreo-com), Behance (https://brandsweets.com/colors/brands/behance-net), Purina Pro Plan (https://brandsweets.com/colors/brands/chewy-com). — https://brandsweets.com/colors/cobalt

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

- On white (#ffffff): 20.31:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.03:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #6a63ee (4.63:1); AA: background → #787878 (4.6:1); AAA: text → #918cf2 (7.24:1); AAA: background → #999999 (7.13:1)

## Brands using this color

- **Midjourney** — text #06051d (Δ 1.351) — https://brandsweets.com/colors/brands/midjourney-com

## Fonts for this mood

- technical: https://brandsweets.com/fonts/mood/technical
- modern: https://brandsweets.com/fonts/mood/modern
- 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/04031b-a39cc4-dfa04e-261f2d-e9edf1?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: "#04031b" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.