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
#355d79
#355d79
hex
#355d79rgb
rgb(53, 93, 121)hsl
hsl(205, 39%, 34%)oklch
oklch(0.461 0.064 240.6)Closest name: Atlantis (#336172)Relative luminance 0.0997
Colors that go with #355d79
Royal Blue, Sienna 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.
Royal Blue #4169e1
analogousshippedRoyal Blue is #355d79'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 #355d79 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped8 real palettes, including Tesco's brand system and Activision's brand system put Blue beside #355d79, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #355d79: 4 real palettes, including Open House and Dusk, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #355d79: 4 real palettes, including Fintech Trust and Unilever's brand system, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #355d79: 4 real palettes, including Dusk and Desert Road, as the accent.
Crimson #dc143c
shippedCrimson is paired with #355d79 in 14 real palettes, including Codecademy's brand system and Costco's brand system, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #355d79: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #355d79
Tints & shades
Harmonies
Contrast
| #355d79 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.02:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.99:1 | 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 #355d79 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#355d79 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #355d79
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 #355d79 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/355d79-9cafc4-df4e58-1f212d-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