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
#3e5d7e
#3e5d7e
hex
#3e5d7ergb
rgb(62, 93, 126)hsl
hsl(211, 34%, 37%)oklch
oklch(0.469 0.065 250.8)Closest name: Deep Indigo (#4c567a)Relative luminance 0.1036
Colors that go with #3e5d7e
Sienna, Amber and 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.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #3e5d7e 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 #3e5d7e in 4 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 #3e5d7e, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3e5d7e: 6 real palettes, including Fintech Trust and Unilever's brand system, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #3e5d7e: 4 real palettes, including Dusk and Desert Road, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3e5d7e in 15 real palettes, including Codecademy's brand system and Costco's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #3e5d7e: 16 real palettes, including HP's brand system and The New York Times's brand system, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #3e5d7e: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #3e5d7e
Tints & shades
Harmonies
Contrast
| #3e5d7e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.84:1 | pass | pass | fail |
|
Aaon black | 3.07:1 | 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 #3e5d7e 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
mcpConnect your agent — build around #3e5d7e
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 #3e5d7e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3e5d7e-9cabc4-df534e-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