Campus
Open in tool →Institutional blue with a highlighter-amber accent — trustworthy for parents, lively enough for students.
Color
#1f51db
#1f51db
hex
#1f51dbrgb
rgb(31, 81, 219)hsl
hsl(224, 75%, 49%)oklch
oklch(0.497 0.217 264.3)Closest name: Denim (#1560bd)Relative luminance 0.1129
Colors that go with #1f51db
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 #1f51db: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #1f51db — 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 #1f51db in 7 real palettes, including Walmart's brand system and NBA's brand system, as the accent.
Blue #0000ff
shipped8 real palettes, including Headspace's brand system and Dropbox's brand system put Blue beside #1f51db, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #1f51db: 10 real palettes, including Gopro's brand system and NBA's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #1f51db in 18 real palettes, including Chase's brand system and Behance's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #1f51db: 7 real palettes, including Elastic's brand system and Warp's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #1f51db: 11 real palettes, including Coursera's brand system and HashiCorp's brand system, as the supporting colour.
Real palettes that use #1f51db
Tints & shades
Harmonies
Contrast
| #1f51db as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.45:1 | pass | pass | fail |
|
Aaon black | 3.26:1 | 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 #1f51db 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
#1f51db reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #1f51db
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 #1f51db and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/1f51db-9ca2c4-df724e-221f2d-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