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
#3a5c83
#3a5c83
hex
#3a5c83rgb
rgb(58, 92, 131)hsl
hsl(212, 39%, 37%)oklch
oklch(0.467 0.075 252.8)Closest name: Deep Indigo (#4c567a)Relative luminance 0.1019
Colors that go with #3a5c83
Sea Green, 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.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #3a5c83 — 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 #3a5c83 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 #3a5c83 in 5 real palettes, including McDonald's's brand system and Lemon Squeezy's brand system, as the lead colour.
Blue #0000ff
shipped5 real palettes, including Tesco's brand system and Activision's brand system put Blue beside #3a5c83, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3a5c83: 6 real palettes, including Fintech Trust and Unilever's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #3a5c83 in 17 real palettes, including Costco's brand system and Walgreens's brand system, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #3a5c83: 4 real palettes, including Lamborghini's brand system and Venmo's brand system, as the supporting colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #3a5c83: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #3a5c83
Tints & shades
Harmonies
Contrast
| #3a5c83 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.91:1 | pass | pass | fail |
|
Aaon black | 3.04:1 | 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 #3a5c83 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
#3a5c83 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #3a5c83
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 #3a5c83 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3a5c83-9caac4-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