Color
#311f5b
#311f5brgb(49, 31, 91)hsl(258, 49%, 24%)oklch(0.298 0.103 293)Colors that go with #311f5b
Charcoal, Dark Olive Green and Royal 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #311f5b: softer than #000 and cool enough to feel like part of the same palette.
Dark Olive Green #556b2f
complementaryshippedDark Olive Green sits directly opposite #311f5b on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Royal Blue #4169e1
analogousshippedRoyal Blue is #311f5b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #311f5b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Teal #008080
triadicshippedTeal completes a triad with #311f5b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #311f5b in 6 real palettes, including Southwest Airlines's brand system and Beach Hut, as the accent.
Blue #0000ff
shipped12 real palettes, including Sketch's brand system and Monzo's brand system put Blue beside #311f5b, as the accent.
Burlywood #deb887
shippedBurlywood is paired with #311f5b in 4 real palettes, including Coastal and Polaroid, as the accent.
Real palettes that use #311f5b
Tints & shades
Harmonies
Contrast
| #311f5b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 14.21:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.48:1 | 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 #311f5b as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#311f5b reads as cool, dark, luxury. 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 #311f5b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/311f5b-ad9cc4-dfc44e-291f2d-e9ebf1?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