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
#375d8b
#375d8b
hex
#375d8brgb
rgb(55, 93, 139)hsl
hsl(213, 43%, 38%)oklch
oklch(0.472 0.087 254.1)Closest name: Blue Velvet (#0d6183)Relative luminance 0.1051
Colors that go with #375d8b
Charcoal, Sea Green and Sienna 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #375d8b: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #375d8b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #375d8b 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 #375d8b in 6 real palettes, including Lemon Squeezy's brand system and Warner Bros.'s brand system, as the lead colour.
Blue #0000ff
shipped4 real palettes, including CVS's brand system and Pixar's brand system put Blue beside #375d8b, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #375d8b: 4 real palettes, including Coca-Cola's brand system and Gopro's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #375d8b in 11 real palettes, including Amazon's brand system and Target : Expect More. Pay Less.'s brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #375d8b: 5 real palettes, including Wendy's's brand system and AT&T's brand system, as the supporting colour.
Real palettes that use #375d8b
Tints & shades
Harmonies
Contrast
| #375d8b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.77:1 | pass | pass | fail |
|
Aaon black | 3.1:1 | 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 #375d8b as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#375d8b reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #375d8b
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 #375d8b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/375d8b-9ca9c4-df584e-1f202d-e9f0f1?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