Color
#3f3b59
#3f3b59rgb(63, 59, 89)hsl(248, 20%, 29%)oklch(0.37 0.051 289.8)Colors that go with #3f3b59
Sea Green, Steel Blue and Teal 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.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #3f3b59: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Steel Blue #4682b4
analogousshippedSteel Blue is #3f3b59's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Teal #008080
triadicshippedTeal completes a triad with #3f3b59 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Dark Olive Green #556b2f
complementaryshippedDark Olive Green sits directly opposite #3f3b59 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped11 real palettes, including Alaska Airlines's brand system and Dunkin''s brand system put Blue beside #3f3b59, as the accent.
Blush Pink #e8b4b8
shipped4 real palettes, including Nursery and Garden Wedding put Blush Pink beside #3f3b59, as the lead colour.
Burlywood #deb887
shippedBurlywood is paired with #3f3b59 in 4 real palettes, including Polaroid and Velvet, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #3f3b59: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #3f3b59
Tints & shades
Harmonies
Contrast
| #3f3b59 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.6:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.98:1 | 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 #3f3b59 as the background.
Brands using this color
Fonts for this mood
#3f3b59 reads as cool, muted, dark. The font library is tagged with the same vocabulary:
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #3f3b59 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f3b59-a69cc4-dfac4e-271f2d-e9ecf1?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