Harbour
Open in tool →Steel blue and haze with a buoy orange on a pale grey — the maritime palette every port town uses for a reason.
Color
#315781
#315781
hex
#315781rgb
rgb(49, 87, 129)hsl
hsl(212, 45%, 35%)oklch
oklch(0.449 0.082 252.2)Closest name: Assassin (#2d4f83)Relative luminance 0.0905
Colors that go with #315781
Sea Green, Blue and Cornflower 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.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #315781 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Blue #0000ff
shipped7 real palettes, including Tesco's brand system and CVS's brand system put Blue beside #315781, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #315781: 4 real palettes, including Coca-Cola's brand system and Gopro's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #315781 in 14 real palettes, including Walgreens's brand system and Codecademy's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #315781: 5 real palettes, including Fireside and Wendy's's brand system, as the lead colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #315781 in 5 real palettes, including Open House and Sapphire & Gold, as the accent.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #315781 in 5 real palettes, including Console Light and Fintech Trust, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #315781: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #315781
Tints & shades
Harmonies
Contrast
| #315781 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.47:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.81:1 | 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 #315781 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#315781 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #315781
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 #315781 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/315781-9caac4-df564e-1f202d-e9f1f1?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