Bookshop
Open in tool →Chestnut and forest on cream read like a cloth-bound spine; the palette recedes so covers and type do the talking.
Color
#3f5f4e
#3f5f4e
hex
#3f5f4ergb
rgb(63, 95, 78)hsl
hsl(148, 20%, 31%)oklch
oklch(0.455 0.047 160.6)Closest name: Ethereal Woods (#3e5e4e)Relative luminance 0.0979
Colors that go with #3f5f4e
Cadet Blue, Champagne 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.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #3f5f4e: 4 real palettes, including Paper & Pine and Alpine, as the supporting colour.
Champagne #f7e7ce
shipped4 real palettes, including Darkroom and BrandSweets's brand system put Champagne beside #3f5f4e, as the surface under it.
Copper #b87333
shippedDesigners have shipped Copper with #3f5f4e: 4 real palettes, including Desert Road and Clay & Linen, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #3f5f4e in 7 real palettes, including Gemstone and Codecademy's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #3f5f4e: 9 real palettes, including HP's brand system and Hinge's brand system, as the accent.
Goldenrod #daa520
shippedGoldenrod shows up next to #3f5f4e in 4 real palettes, including Fireside and Mid-Century, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #3f5f4e: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Rose Gold #b76e79
complementaryRose Gold sits directly opposite #3f5f4e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #3f5f4e
Tints & shades
Harmonies
Contrast
| #3f5f4e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.1:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.96:1 | 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 #3f5f4e 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 #3f5f4e
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 #3f5f4e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3f5f4e-a2beb2-d259d4-1f2d2c-eaf1e9?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