Color
#3f4878
#3f4878rgb(63, 72, 120)hsl(231, 31%, 36%)oklch(0.417 0.081 274.3)Colors that go with #3f4878
Steel Blue, Blue and Crimson 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.
Steel Blue #4682b4
analogousshippedSteel Blue is #3f4878's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped6 real palettes, including Alaska Airlines's brand system and CVS's brand system put Blue beside #3f4878, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3f4878 in 10 real palettes, including Codecademy's brand system and Walgreens's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #3f4878: 14 real palettes, including HP's brand system and Hinge's brand system, as the accent.
Goldenrod #daa520
shippedGoldenrod shows up next to #3f4878 in 4 real palettes, including Sapphire & Gold and Open House, as the supporting colour.
Midnight Blue #191970
shipped15 real palettes, including First Snow and Microsoft's brand system put Midnight Blue beside #3f4878, as that palette's text colour.
Orange Red #ff4500
shippedOrange Red is paired with #3f4878 in 5 real palettes, including Tumblr's brand system and NASA's brand system, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #3f4878: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #3f4878
Tints & shades
Harmonies
Contrast
| #3f4878 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.72:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.41:1 | 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 #3f4878 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
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 #3f4878 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f4878-9c9ec4-df834e-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