# #045f81

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

## Values

- Hex: `#045f81`
- RGB: rgb(4, 95, 129)
- HSL: hsl(196, 94%, 26%)
- OKLCH: oklch(0.456 0.092 232)
- Relative luminance: 0.098
- Nearest named color: Blue Velvet (#0d6183, Δ 0.756) — https://brandsweets.com/colors/blue-velvet
- Moods: cool, vivid, dark, technical, modern, luxury, bold
- Page: https://brandsweets.com/colors/045f81

## Tints & shades

- Tints (toward white): #0579a3, #0693c6, #07b0ed, #20bff8, #43c9f9, #66d3fa, #88ddfb, #b0e8fd, #d2f2fe, #f5fcff
- Shades (toward black): #045877, #03516d, #03465e, #033e54, #02374a, #023040, #022836, #011d28, #01161e, #010f14

## Harmonies

- Complementary: #812504
- Analogous: #048164, #042181
- Triadic: #81045f, #5f8104
- Split-complementary: #810421, #816404
- Tetradic: #640481, #812504, #218104

## Colors that go with #045f81

Named partners (harmony on the OKLCH wheel, co-occurrence in curated palettes and brand systems, and the neutrals that carry it), best first:

- **Crimson** #dc143c [harmony, pool: split] — Crimson is a split-complement of #045f81: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Costco (https://brandsweets.com/colors/brands/costco-com), Codecademy (https://brandsweets.com/colors/brands/codecademy-com), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Walgreens (https://brandsweets.com/colors/brands/walgreens-com). — https://brandsweets.com/colors/crimson
- **Royal Blue** #4169e1 [harmony, pool: analogous] — Royal Blue is #045f81's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Motorola (https://brandsweets.com/colors/brands/motorola-com), Stripe (https://brandsweets.com/colors/brands/stripe), Carrefour (https://brandsweets.com/colors/brands/carrefour-com), GitHub (https://brandsweets.com/colors/brands/github). — https://brandsweets.com/colors/royalblue
- **Sienna** #a0522d [harmony, pool: complementary] — Sienna sits directly opposite #045f81 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Dyson (https://brandsweets.com/colors/brands/dyson-com). — https://brandsweets.com/colors/sienna
- **Amber** #ffbf00 [pool] — Amber is paired with #045f81 in 4 real palettes, including McDonald's's brand system and Lemon Squeezy's brand system, as the lead colour. Seen in: McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), Warner Bros. (https://brandsweets.com/colors/brands/warnerbros-com), Wired (https://brandsweets.com/colors/brands/wired-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 7 real palettes, including Tesco's brand system and CVS's brand system put Blue beside #045f81, as the supporting colour. Seen in: Tesco (https://brandsweets.com/colors/brands/tesco-com), CVS (https://brandsweets.com/colors/brands/cvs-com), Activision (https://brandsweets.com/colors/brands/activision-com), Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com). — https://brandsweets.com/colors/blue
- **Cadet Blue** #5f9ea0 [pool] — Designers have shipped Cadet Blue with #045f81: 4 real palettes, including Open House and Alpine, as the supporting colour. Seen in: Open House (https://brandsweets.com/palettes/clean#open-house), Alpine (https://brandsweets.com/palettes/cool#alpine), Dusk (https://brandsweets.com/palettes/cool#dusk), Paper & Pine (https://brandsweets.com/palettes/minimal#paper-and-pine). — https://brandsweets.com/colors/cadetblue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #045f81: 5 real palettes, including Unilever's brand system and Fintech Trust, as the lead colour. Seen in: Unilever (https://brandsweets.com/colors/brands/unilever-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Glacier (https://brandsweets.com/palettes/cool#glacier), Intel (https://brandsweets.com/colors/brands/intel-com). — https://brandsweets.com/colors/cobalt
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #045f81: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy. — https://brandsweets.com/colors/whitesmoke

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

- On white (#ffffff): 7.1:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.96:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #057da8 (4.51:1); AA: background → #cfcfcf (4.56:1); AAA: text → #07a1da (7.12:1); AAA: background → #ffffff (7.1:1)

## Brands using this color

- **Capital One** — secondary #255f82 (Δ 1.58) — https://brandsweets.com/colors/brands/capitalone-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/045f81-9cb5c4-df4e6e-1f232d-e9f1ef?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: "#045f81" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.