Darkroom
Open in tool →Sepia, faded ochre and a teal shadow on aged paper — the photograph-in-a-drawer palette, tuned so it still passes AA.
Color
#37575c
#37575c
hex
#37575crgb
rgb(55, 87, 92)hsl
hsl(188, 25%, 29%)oklch
oklch(0.434 0.038 208.2)Closest name: Arctic Nights (#345c61)Relative luminance 0.084
Colors that go with #37575c
Sienna, Blue and Cadet 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 #37575c on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped4 real palettes, including Warp's brand system and Alaska Airlines's brand system put Blue beside #37575c, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #37575c: 4 real palettes, including Paper & Pine and Dusk, as the supporting colour.
Copper #b87333
shippedDesigners have shipped Copper with #37575c: 4 real palettes, including Desert Road and Dusk, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #37575c in 5 real palettes, including Codecademy's brand system and Gemstone, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #37575c: 7 real palettes, including HP's brand system and Hinge's brand system, as the accent.
Goldenrod #daa520
shippedGoldenrod shows up next to #37575c in 4 real palettes, including Fireside and Mid-Century, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #37575c: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #37575c
Tints & shades
Harmonies
Contrast
| #37575c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.84:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.68:1 | 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 #37575c 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
#37575c reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #37575c
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 #37575c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/37575c-a2b7be-df4e81-1f252d-e9f1ee?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