Campus
Open in tool →Institutional blue with a highlighter-amber accent — trustworthy for parents, lively enough for students.
Color
#3151d3
#3151d3
hex
#3151d3rgb
rgb(49, 81, 211)hsl
hsl(228, 65%, 51%)oklch
oklch(0.496 0.203 267.5)Closest name: Denim (#1560bd)Relative luminance 0.1124
Colors that go with #3151d3
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 #3151d3: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #3151d3 — 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 #3151d3 in 7 real palettes, including Walmart's brand system and Warner Bros.'s brand system, as the accent.
Blue #0000ff
shipped11 real palettes, including Zillow's brand system and Pixar's brand system put Blue beside #3151d3, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #3151d3: 10 real palettes, including Gopro's brand system and Coca-Cola's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #3151d3 in 15 real palettes, including Chase's brand system and Netflix's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #3151d3: 6 real palettes, including Calm's brand system and Elastic's brand system, as the lead colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #3151d3: 7 real palettes, including Coursera's brand system and HashiCorp's brand system, as the supporting colour.
Real palettes that use #3151d3
Tints & shades
Harmonies
Contrast
| #3151d3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.47:1 | pass | pass | fail |
|
Aaon black | 3.25:1 | 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 #3151d3 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
#3151d3 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #3151d3
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 #3151d3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3151d3-9c9fc4-df7c4e-231f2d-e9eff1?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