# #031b63

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

## Values

- Hex: `#031b63`
- RGB: rgb(3, 27, 99)
- HSL: hsl(225, 94%, 20%)
- OKLCH: oklch(0.266 0.13 263.9)
- Relative luminance: 0.017
- Nearest named color: Dying Storm Blue (#111166, Δ 2.137) — https://brandsweets.com/colors/dying-storm-blue
- Moods: cool, vivid, dark, technical, modern, luxury, bold
- Page: https://brandsweets.com/colors/031b63

## Tints & shades

- Tints (toward white): #04268b, #0631b2, #073ad5, #0d47f8, #3465f9, #5c83fa, #83a1fb, #a6bcfc, #cedafd, #f5f8ff
- Shades (toward black): #031859, #031754, #02144a, #021345, #02103b, #020e31, #010c2d, #010923, #01081e, #010514

## Harmonies

- Complementary: #634b03
- Analogous: #034b63, #1b0363
- Triadic: #63031b, #1b6303
- Split-complementary: #631b03, #4b6303
- Tetradic: #63034b, #634b03, #03631b

## Colors that go with #031b63

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 #031b63: softer than #000 and cool enough to feel like part of the same palette. Seen in: Plaid (https://brandsweets.com/colors/brands/plaid-com), CeraVe (https://brandsweets.com/colors/brands/cerave-com), Boeing (https://brandsweets.com/colors/brands/boeing-com), Microsoft (https://brandsweets.com/colors/brands/microsoft-com). — https://brandsweets.com/colors/charcoal
- **Crimson** #dc143c [harmony, pool: triadic] — Crimson completes a triad with #031b63 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Nintendo (https://brandsweets.com/colors/brands/nintendo-com), Casper Sleep (https://brandsweets.com/colors/brands/casper-com), Marvel (https://brandsweets.com/colors/brands/marvel-com), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember). — https://brandsweets.com/colors/crimson
- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #031b63's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Deep Water (https://brandsweets.com/palettes/dark#deep-water), Glacier (https://brandsweets.com/palettes/cool#glacier), Plaid (https://brandsweets.com/colors/brands/plaid-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/steelblue
- **Blue** #0000ff [pool] — 5 real palettes, including Monzo's brand system and Penpot's brand system put Blue beside #031b63, as the accent. Seen in: Monzo (https://brandsweets.com/colors/brands/monzo-com), Penpot (https://brandsweets.com/colors/brands/penpot-app), Sketch (https://brandsweets.com/colors/brands/sketch-com), League of Legends (https://brandsweets.com/colors/brands/leagueoflegends-com). — https://brandsweets.com/colors/blue
- **Cadet Blue** #5f9ea0 [pool] — Designers have shipped Cadet Blue with #031b63: 6 real palettes, including SoFi's brand system and Open House, as the supporting colour. Seen in: SoFi (https://brandsweets.com/colors/brands/sofi-com), Open House (https://brandsweets.com/palettes/clean#open-house), Coastal (https://brandsweets.com/palettes/cool#coastal), Arctic (https://brandsweets.com/palettes/clean#arctic). — https://brandsweets.com/colors/cadetblue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #031b63: 10 real palettes, including Glacier and Blue Mono, as the accent. Seen in: Glacier (https://brandsweets.com/palettes/cool#glacier), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Purina Pro Plan (https://brandsweets.com/colors/brands/chewy-com), MLB (https://brandsweets.com/colors/brands/mlb-com). — https://brandsweets.com/colors/cobalt
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #031b63: 4 real palettes, including Deep Water and Kraken's brand system, as the lead colour. Seen in: Deep Water (https://brandsweets.com/palettes/dark#deep-water), Kraken (https://brandsweets.com/colors/brands/kraken-com), Blueprint (https://brandsweets.com/palettes/technical#blueprint), Vimeo (https://brandsweets.com/colors/brands/vimeo-com). — https://brandsweets.com/colors/deepskyblue
- **Denim** #1560bd [pool] — Designers have shipped Denim with #031b63: 18 real palettes, including Bank of America's brand system and Skechers's brand system, as the accent. Seen in: Bank of America (https://brandsweets.com/colors/brands/bankofamerica-com), Skechers (https://brandsweets.com/colors/brands/skechers-com), British Airways (https://brandsweets.com/colors/brands/britishairways-com), KLM (https://brandsweets.com/colors/brands/klm-com). — https://brandsweets.com/colors/denim

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

- On white (#ffffff): 15.66:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.34:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #3969f9 (4.56:1); AA: background → #8a8a8a (4.54:1); AAA: text → #7092fb (7.19:1); AAA: background → #b0b0b0 (7.22:1)

## Brands using this color

- **Gillette** — secondary #001e60 (Δ 0.861) — https://brandsweets.com/colors/brands/gillette-com
- **Crest** — accent #0e1c63 (Δ 1.133) — https://brandsweets.com/colors/brands/crest-com
- **Airbus** — secondary #00205b (Δ 1.847) — https://brandsweets.com/colors/brands/airbus-com
- **Bank of America** — secondary #012169 (Δ 1.85) — https://brandsweets.com/colors/brands/bankofamerica-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/031b63-9ca1c4-df754e-221f2d-e9eff1?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: "#031b63" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.