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
#3f545a
#3f545a
hex
#3f545argb
rgb(63, 84, 90)hsl
hsl(193, 18%, 30%)oklch
oklch(0.431 0.028 217.2)Closest name: All Nighter (#455454)Relative luminance 0.0814
Colors that go with #3f545a
Blue, Cadet Blue and Copper 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.
Blue #0000ff
shipped6 real palettes, including Jeep's brand system and Rolex's brand system put Blue beside #3f545a, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #3f545a: 4 real palettes, including Paper & Pine and Dusk, as the supporting colour.
Copper #b87333
shippedDesigners have shipped Copper with #3f545a: 4 real palettes, including Desert Road and Dusk, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #3f545a in 5 real palettes, including Codecademy's brand system and Gemstone, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #3f545a: 8 real palettes, including HP's brand system and Hinge's brand system, as the accent.
Goldenrod #daa520
shippedGoldenrod shows up next to #3f545a in 5 real palettes, including Fireside and Disney's brand system, as the accent.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #3f545a in 4 real palettes, including Console Light and Mint Modern, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the near-white surface #3f545a was made for — maximum legibility with no colour cast to argue with.
Real palettes that use #3f545a
Tints & shades
Harmonies
Contrast
| #3f545a as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.99:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.63:1 | 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 #3f545a 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
#3f545a reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #3f545a
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 #3f545a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3f545a-a2b5be-df4e75-1f242d-e9f1ef?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