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
#315e7c
#315e7c
hex
#315e7crgb
rgb(49, 94, 124)hsl
hsl(204, 43%, 34%)oklch
oklch(0.463 0.07 239.8)Closest name: Atlantis (#336172)Relative luminance 0.1011
Colors that go with #315e7c
Royal Blue, Sienna 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.
Royal Blue #4169e1
analogousshippedRoyal Blue is #315e7c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #315e7c on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #315e7c in 4 real palettes, including McDonald's's brand system and Lemon Squeezy's brand system, as the lead colour.
Blue #0000ff
shipped8 real palettes, including Tesco's brand system and Activision's brand system put Blue beside #315e7c, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #315e7c: 4 real palettes, including Open House and Dusk, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #315e7c: 6 real palettes, including Fintech Trust and Unilever's brand system, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #315e7c: 4 real palettes, including Dusk and Desert Road, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #315e7c: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #315e7c
Tints & shades
Harmonies
Contrast
| #315e7c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.95:1 | pass | pass | fail |
|
Aaon black | 3.02:1 | 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 #315e7c as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#315e7c reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #315e7c
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 #315e7c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/315e7c-9cafc4-df4e5a-1f222d-e9f1f0?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