Color
#3f5288
#3f5288rgb(63, 82, 136)hsl(224, 37%, 39%)oklch(0.449 0.092 267.9)Colors that go with #3f5288
Sea Green, Steel Blue 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.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #3f5288 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Steel Blue #4682b4
analogousshippedSteel Blue is #3f5288's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Amber #ffbf00
shippedAmber is paired with #3f5288 in 4 real palettes, including McDonald's's brand system and Warner Bros.'s brand system, as the lead colour.
Blue #0000ff
shipped6 real palettes, including Tesco's brand system and CVS's brand system put Blue beside #3f5288, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #3f5288 in 14 real palettes, including Walgreens's brand system and Wells Fargo's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #3f5288: 7 real palettes, including Campbell's's brand system and AT&T's brand system, as the supporting colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #3f5288 in 5 real palettes, including Open House and Sapphire & Gold, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #3f5288: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #3f5288
Tints & shades
Harmonies
Contrast
| #3f5288 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.57:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.77:1 | 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 #3f5288 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#3f5288 reads as cool, modern. 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 #3f5288 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f5288-9ca2c4-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