Color
#403e5b
#403e5brgb(64, 62, 91)hsl(244, 19%, 30%)oklch(0.379 0.049 287)Colors that go with #403e5b
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 #403e5b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Steel Blue #4682b4
analogousshippedSteel Blue is #403e5b'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 #403e5b — 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 #403e5b on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped10 real palettes, including Alaska Airlines's brand system and Jeep's brand system put Blue beside #403e5b, as the accent.
Blush Pink #e8b4b8
shipped4 real palettes, including Nursery and Garden Wedding put Blush Pink beside #403e5b, as the lead colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #403e5b: 5 real palettes, including Paper & Pine and Clean Beauty, as the supporting colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #403e5b: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #403e5b
Tints & shades
Harmonies
Contrast
| #403e5b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.2:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.06:1 | 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 #403e5b as the background.
Brands using this color
Fonts for this mood
#403e5b 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 #403e5b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/403e5b-a39cc4-dfa24e-261f2d-e9edf1?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