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
#315c63
#315c63
hex
#315c63rgb
rgb(49, 92, 99)hsl
hsl(188, 34%, 29%)oklch
oklch(0.447 0.049 209.1)Closest name: Arctic Nights (#345c61)Relative luminance 0.0921
Colors that go with #315c63
Rust, Steel Blue 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.
Rust #b7410e
complementaryshippedRust sits directly opposite #315c63 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Steel Blue #4682b4
analogousshippedSteel Blue is #315c63's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped6 real palettes, including Rolex's brand system and Jeep's brand system put Blue beside #315c63, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #315c63: 4 real palettes, including Open House and Alpine, as the supporting colour.
Copper #b87333
shippedDesigners have shipped Copper with #315c63: 4 real palettes, including Desert Road and Dusk, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #315c63 in 7 real palettes, including Codecademy's brand system and Gemstone, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #315c63: 11 real palettes, including HP's brand system and Hinge's brand system, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #315c63: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #315c63
Tints & shades
Harmonies
Contrast
| #315c63 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.39:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.84:1 | 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 #315c63 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
#315c63 reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #315c63
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 #315c63 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/315c63-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