Campus
Open in tool →Institutional blue with a highlighter-amber accent — trustworthy for parents, lively enough for students.
Color
#304bd5
#304bd5
hex
#304bd5rgb
rgb(48, 75, 213)hsl
hsl(230, 66%, 51%)oklch
oklch(0.487 0.213 268.3)Closest name: Blurple (#5539cc)Relative luminance 0.1046
Colors that go with #304bd5
Charcoal, Sea Green and Amber lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #304bd5: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #304bd5 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #304bd5 in 7 real palettes, including Walmart's brand system and Warner Bros.'s brand system, as the accent.
Blue #0000ff
shipped10 real palettes, including Zillow's brand system and Headspace's brand system put Blue beside #304bd5, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #304bd5: 10 real palettes, including Gopro's brand system and Qualcomm's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #304bd5 in 18 real palettes, including Behance's brand system and Chase's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #304bd5: 6 real palettes, including Warp's brand system and Calm's brand system, as the lead colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #304bd5: 10 real palettes, including Coursera's brand system and HashiCorp's brand system, as the supporting colour.
Real palettes that use #304bd5
Tints & shades
Harmonies
Contrast
| #304bd5 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.79:1 | pass | pass | fail |
|
Aaon black | 3.09:1 | fail | pass | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #304bd5 as the background.
Brands using this color
Palettes built around it
Peacock
Open in tool →Teal, cobalt and magenta at full chroma on white — jewel tones in daylight; the trick is a near-black text with a blue cast.
Fonts for this mood
#304bd5 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #304bd5
live endpointPoint any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #304bd5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/304bd5-9c9ec4-df814e-231f2d-e9eef1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md