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
#1f615b
#1f615b
hex
#1f615brgb
rgb(31, 97, 91)hsl
hsl(175, 52%, 25%)oklch
oklch(0.45 0.066 186.6)Closest name: Mosque (#005f5b)Relative luminance 0.096
Colors that go with #1f615b
Crimson, 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.
Crimson #dc143c
complementaryshippedCrimson sits directly opposite #1f615b 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 Rolex's brand system and Warp's brand system put Blue beside #1f615b, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #1f615b: 4 real palettes, including Paper & Pine and Alpine, as the supporting colour.
Copper #b87333
shippedDesigners have shipped Copper with #1f615b: 4 real palettes, including Desert Road and Clay & Linen, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #1f615b: 9 real palettes, including HP's brand system and The New York Times's brand system, as the accent.
Goldenrod #daa520
shippedGoldenrod shows up next to #1f615b in 5 real palettes, including Fireside and Mid-Century, as the accent.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #1f615b in 4 real palettes, including Mint Modern and Undergrowth, as the lead colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #1f615b: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #1f615b
Tints & shades
Harmonies
Contrast
| #1f615b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.19:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.92:1 | 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 #1f615b as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#1f615b reads as dark, luxury, bold. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #1f615b
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 #1f615b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/1f615b-a2bdbe-d4599f-1f282d-e9f1ed?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