# #17539b

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

## Values

- Hex: `#17539b`
- RGB: rgb(23, 83, 155)
- HSL: hsl(213, 74%, 35%)
- OKLCH: oklch(0.446 0.132 255.8)
- Relative luminance: 0.0874
- Nearest named color: Blue Chip (#1d5699, Δ 1.084) — https://brandsweets.com/colors/blue-chip
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/17539b

## Tints & shades

- Tints (toward white): #1b61b6, #2071d5, #3381e1, #4e91e4, #6da5e9, #87b5ed, #a2c5f1, #bcd6f5, #dce9fa, #f6fafe
- Shades (toward black): #154c8e, #134481, #113d73, #0f3666, #0d2f59, #0b2647, #091f3a, #07182c, #05111f, #030912

## Harmonies

- Complementary: #9b6017
- Analogous: #17959b, #1e179b
- Triadic: #9b1753, #539b17
- Split-complementary: #9b1e17, #959b17
- Tetradic: #9b1795, #9b6017, #179b1e

## Colors that go with #17539b

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 #17539b: softer than #000 and cool enough to feel like part of the same palette. Seen in: Amazon (https://brandsweets.com/colors/brands/amazon-com), Hasbro (https://brandsweets.com/colors/brands/hasbro-com), Harbour (https://brandsweets.com/palettes/cool#harbour), Hinge (https://brandsweets.com/colors/brands/hinge-co). — https://brandsweets.com/colors/charcoal
- **Crimson** #dc143c [harmony, pool: triadic] — Crimson completes a triad with #17539b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Costco (https://brandsweets.com/colors/brands/costco-com), Target : Expect More. Pay Less. (https://brandsweets.com/colors/brands/target-com), Chase (https://brandsweets.com/colors/brands/chase-com). — https://brandsweets.com/colors/crimson
- **Sienna** #a0522d [harmony, pool: complementary] — Sienna sits directly opposite #17539b 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 #17539b in 6 real palettes, including McDonald's's brand system and Warner Bros.'s brand system, as the lead colour. Seen in: McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Warner Bros. (https://brandsweets.com/colors/brands/warnerbros-com), Wikipedia (https://brandsweets.com/colors/brands/wikipedia-org), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-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 #17539b, 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), Procter & Gamble (https://brandsweets.com/colors/brands/pg-com). — https://brandsweets.com/colors/blue
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #17539b: 4 real palettes, including Blue Mono and Gopro's brand system, as the supporting colour. Seen in: Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Gopro (https://brandsweets.com/colors/brands/gopro-com), Coca-Cola (https://brandsweets.com/colors/brands/coca-cola-com), NBA (https://brandsweets.com/colors/brands/nba-com). — https://brandsweets.com/colors/cornflowerblue
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #17539b: 4 real palettes, including Coursera's brand system and Apple's brand system, as the supporting colour. Seen in: Coursera (https://brandsweets.com/colors/brands/coursera-org), Apple (https://brandsweets.com/colors/brands/apple-com), Venmo (https://brandsweets.com/colors/brands/venmo-com), HashiCorp (https://brandsweets.com/colors/brands/hashicorp-com). — https://brandsweets.com/colors/dodgerblue
- **Firebrick** #b22222 [pool] — Designers have shipped Firebrick with #17539b: 7 real palettes, including Campbell's's brand system and MLB's brand system, as the supporting colour. Seen in: Campbell's (https://brandsweets.com/colors/brands/campbells-com), MLB (https://brandsweets.com/colors/brands/mlb-com), Nissan (https://brandsweets.com/colors/brands/nissanusa-com), AT&T (https://brandsweets.com/colors/brands/att-com). — https://brandsweets.com/colors/firebrick

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

- On white (#ffffff): 7.64:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.75:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #2074d9 (4.56:1); AA: background → #c7c7c7 (4.52:1); AAA: text → #5b9ae6 (7.21:1); AAA: background → #f5f5f5 (7.01:1)

## Brands using this color

- **Tesco** — accent #00539f (Δ 1.035) — https://brandsweets.com/colors/brands/tesco-com
- **General Mills** — secondary #0054a6 (Δ 1.87) — https://brandsweets.com/colors/brands/generalmills-com
- **Carrefour** — accent #004e9f (Δ 1.978) — https://brandsweets.com/colors/brands/carrefour-com

## Fonts for this mood

- technical: https://brandsweets.com/fonts/mood/technical
- modern: https://brandsweets.com/fonts/mood/modern

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/17539b-9ca9c4-df584e-1f202d-e9f0f1?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: "#17539b" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.