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
#1b5f4e
#1b5f4e
hex
#1b5f4ergb
rgb(27, 95, 78)hsl
hsl(165, 56%, 24%)oklch
oklch(0.438 0.073 172.8)Closest name: Evergreen (#125b49)Relative luminance 0.0897
Colors that go with #1b5f4e
Cadet Blue, Crimson and Denim 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 #1b5f4e: 4 real palettes, including Paper & Pine and Alpine, as the supporting colour.
Crimson #dc143c
split-complementshippedCrimson is a split-complement of #1b5f4e: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Denim #1560bd
shippedDesigners have shipped Denim with #1b5f4e: 5 real palettes, including HP's brand system and Hinge's brand system, as the accent.
Goldenrod #daa520
shippedGoldenrod shows up next to #1b5f4e in 4 real palettes, including Fireside and Mid-Century, as the accent.
Orange Red #ff4500
shippedOrange Red is paired with #1b5f4e in 4 real palettes, including Neon's brand system and Clerk's brand system, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #1b5f4e in 5 real palettes, including Console Light and GitHub's brand system, as the lead colour.
Sage Green #9caf88
shippedDesigners have shipped Sage Green with #1b5f4e: 6 real palettes, including Pine & Birch and Darkroom, as the supporting colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #1b5f4e: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #1b5f4e
Tints & shades
Harmonies
Contrast
| #1b5f4e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.52:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.79:1 | 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 #1b5f4e as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#1b5f4e reads as dark, luxury, bold. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #1b5f4e
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 #1b5f4e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/1b5f4e-a2beba-d459b3-1f2b2d-e9f1eb?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