# #21607d

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

## Values

- Hex: `#21607d`
- RGB: rgb(33, 96, 125)
- HSL: hsl(199, 58%, 31%)
- OKLCH: oklch(0.463 0.078 232.1)
- Relative luminance: 0.1017
- Nearest named color: Blue Velvet (#0d6183, Δ 1.235) — https://brandsweets.com/colors/blue-velvet
- Moods: cool, modern
- Page: https://brandsweets.com/colors/21607d

## Tints & shades

- Tints (toward white): #297699, #2f88b1, #3a9dcb, #56abd2, #72b9da, #8ac5e0, #a6d3e7, #c3e1ef, #dbedf5, #f7fbfd
- Shades (toward black): #1e5771, #1c5069, #19475d, #153e51, #133849, #102e3c, #0d2530, #0a1c24, #07161c, #040c10

## Harmonies

- Complementary: #7d3e21
- Analogous: #217d6c, #21327d
- Triadic: #7d2160, #607d21
- Split-complementary: #7d2132, #7d6c21
- Tetradic: #6c217d, #7d3e21, #327d21

## Colors that go with #21607d

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 #21607d: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Codecademy (https://brandsweets.com/colors/brands/codecademy-com), Costco (https://brandsweets.com/colors/brands/costco-com), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Wendy's (https://brandsweets.com/colors/brands/wendys-com). — https://brandsweets.com/colors/crimson
- **Royal Blue** #4169e1 [harmony, pool: analogous] — Royal Blue is #21607d'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), GitHub (https://brandsweets.com/colors/brands/github), Console Light (https://brandsweets.com/palettes/technical#console-light). — https://brandsweets.com/colors/royalblue
- **Sienna** #a0522d [harmony, pool: complementary] — Sienna sits directly opposite #21607d on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: BrandSweets (https://brandsweets.com/colors/brands/brandsweets). — https://brandsweets.com/colors/sienna
- **Amber** #ffbf00 [pool] — Amber is paired with #21607d 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] — 8 real palettes, including Tesco's brand system and Activision's brand system put Blue beside #21607d, as the supporting colour. Seen in: Tesco (https://brandsweets.com/colors/brands/tesco-com), Activision (https://brandsweets.com/colors/brands/activision-com), CVS (https://brandsweets.com/colors/brands/cvs-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 #21607d: 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 #21607d: 6 real palettes, including Fintech Trust and Unilever's brand system, as the lead colour. Seen in: Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Unilever (https://brandsweets.com/colors/brands/unilever-com), Glacier (https://brandsweets.com/palettes/cool#glacier), Ink & Paper (https://brandsweets.com/palettes/minimal#ink-and-paper). — https://brandsweets.com/colors/cobalt
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #21607d: 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): 6.92:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #205d79 (7.23:1)
- On black (#000000): 3.03:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #2b7ca1 (4.5:1); AA: background → #d1d1d1 (4.53:1); AAA: text → #3e9fcc (7.04:1)

## Brands using this color

- **Capital One** — secondary #255f82 (Δ 1.023) — https://brandsweets.com/colors/brands/capitalone-com

## Fonts for this mood

- 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/21607d-9cb3c4-df4e66-1f232d-e9f1f0?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: "#21607d" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.