# #304db5

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

## Values

- Hex: `#304db5`
- RGB: rgb(48, 77, 181)
- HSL: hsl(227, 58%, 45%)
- OKLCH: oklch(0.462 0.168 267.5)
- Relative luminance: 0.0927
- Nearest named color: Blasphemous Blue (#3356aa, Δ 3.08) — https://brandsweets.com/colors/blasphemous-blue
- Moods: cool, modern
- Page: https://brandsweets.com/colors/304db5

## Tints & shades

- Tints (toward white): #3656c9, #4e6ad0, #627bd5, #768cdb, #8ea0e1, #a2b1e6, #b6c2ec, #cbd3f1, #e3e7f8, #f7f8fd
- Shades (toward black): #2c46a5, #283f95, #233885, #1f3275, #1b2b65, #152251, #111b40, #0d1530, #090e20, #040710

## Harmonies

- Complementary: #b59830
- Analogous: #3090b5, #5630b5
- Triadic: #b5304d, #4db530
- Split-complementary: #b55630, #90b530
- Tetradic: #b53090, #b59830, #30b556

## Colors that go with #304db5

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 #304db5: softer than #000 and cool enough to feel like part of the same palette. Seen in: UEFA (https://brandsweets.com/colors/brands/uefa-com), Hasbro (https://brandsweets.com/colors/brands/hasbro-com), Hinge (https://brandsweets.com/colors/brands/hinge-co), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com). — https://brandsweets.com/colors/charcoal
- **Sea Green** #2e8b57 [harmony, pool: triadic] — Sea Green completes a triad with #304db5 — 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), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Netflix (https://brandsweets.com/colors/brands/netflix), Paramount+ (https://brandsweets.com/colors/brands/paramountplus-com). — https://brandsweets.com/colors/seagreen
- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #304db5's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: American Express (https://brandsweets.com/colors/brands/americanexpress-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Glacier (https://brandsweets.com/palettes/cool#glacier), Hershey's (https://brandsweets.com/colors/brands/hersheys-com). — https://brandsweets.com/colors/steelblue
- **Amber** #ffbf00 [pool] — Amber is paired with #304db5 in 6 real palettes, including Warner Bros.'s brand system and Wikipedia's brand system, as the accent. Seen in: Warner Bros. (https://brandsweets.com/colors/brands/warnerbros-com), Wikipedia (https://brandsweets.com/colors/brands/wikipedia-org), Walmart (https://brandsweets.com/colors/brands/walmart-com), NBA (https://brandsweets.com/colors/brands/nba-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 7 real palettes, including Tesco's brand system and Pixar's brand system put Blue beside #304db5, as the supporting colour. Seen in: Tesco (https://brandsweets.com/colors/brands/tesco-com), Pixar (https://brandsweets.com/colors/brands/pixar-com), CVS (https://brandsweets.com/colors/brands/cvs-com), Zillow (https://brandsweets.com/colors/brands/zillow-com). — https://brandsweets.com/colors/blue
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #304db5: 7 real palettes, including Gopro's brand system and Blue Mono, as the supporting colour. Seen in: Gopro (https://brandsweets.com/colors/brands/gopro-com), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Coca-Cola (https://brandsweets.com/colors/brands/coca-cola-com), NBA (https://brandsweets.com/colors/brands/nba-com). — https://brandsweets.com/colors/cornflowerblue
- **Crimson** #dc143c [pool] — Crimson is paired with #304db5 in 15 real palettes, including Chase's brand system and Walgreens's brand system, as the accent. Seen in: Chase (https://brandsweets.com/colors/brands/chase-com), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Target : Expect More. Pay Less. (https://brandsweets.com/colors/brands/target-com), Costco (https://brandsweets.com/colors/brands/costco-com). — https://brandsweets.com/colors/crimson
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #304db5: 5 real palettes, including Kraken's brand system and Venmo's brand system, as the accent. Seen in: Kraken (https://brandsweets.com/colors/brands/kraken-com), Venmo (https://brandsweets.com/colors/brands/venmo-com), Calm (https://brandsweets.com/colors/brands/calm-com), Deep Water (https://brandsweets.com/palettes/dark#deep-water). — https://brandsweets.com/colors/deepskyblue

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

- On white (#ffffff): 7.36:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.85:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #5671d2 (4.69:1); AA: background → #cccccc (4.58:1); AAA: text → #7e93dd (7.1:1); AAA: background → #fafafa (7.05:1)

## Brands using this color

- **Airtable** — primary #254fad (Δ 1.718) — https://brandsweets.com/colors/brands/airtable-com
- **Fivetran blue** — secondary #2e54b6 (Δ 1.733) — https://brandsweets.com/colors/brands/fivetran-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/304db5-9ca0c4-df7a4e-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: "#304db5" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.