Color
#0509cc
#0509ccrgb(5, 9, 204)hsl(239, 95%, 41%)oklch(0.387 0.261 264.7)Colors that go with #0509cc
Midnight Blue, Orange Red and Royal Blue 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.
Midnight Blue #191970
shippedMidnight Blue is paired with #0509cc in 4 real palettes, including Monzo's brand system and Sketch's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Orange Red #ff4500
shippedOrange Red is paired with #0509cc in 4 real palettes, including Intercom's brand system and Monzo's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Royal Blue #4169e1
shippedRoyal Blue is paired with #0509cc in 4 real palettes, including Dropbox's brand system and Headspace's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Olive Green #808000
complementaryOlive Green sits directly opposite #0509cc on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Forest Green #228b22
triadicshippedForest Green completes a triad with #0509cc — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Crimson #dc143c
triadicshippedCrimson completes a triad with #0509cc — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
split-complementSienna is a split-complement of #0509cc: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #0509cc: softer than #000 and cool enough to feel like part of the same palette.
Real palettes that use #0509cc
Tints & shades
Harmonies
Contrast
| #0509cc as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.95:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.92:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0509cc as the background.
Brands using this color
Fonts for this mood
#0509cc reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #0509cc and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/0509cc-a09cc4-df964e-251f2d-e9edf1?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