Color
#421f89
#421f89rgb(66, 31, 137)hsl(260, 63%, 33%)oklch(0.359 0.162 290.9)Colors that go with #421f89
Blue, Charcoal and Crimson 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.
Blue #0000ff
shippedBlue is paired with #421f89 in 4 real palettes, including Zillow's brand system and Pepsi's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #421f89: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
shippedCrimson is paired with #421f89 in 4 real palettes, including Casper Sleep's brand system and Marvel's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Denim #1560bd
shippedDenim is paired with #421f89 in 5 real palettes, including Google's brand system and Slack's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Royal Blue #4169e1
analogousshippedRoyal Blue is #421f89's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Steel Blue #4682b4
shippedSteel Blue is paired with #421f89 in 4 real palettes, including Hershey's's brand system and Fintech Trust, as the accent — a combination designers have actually shipped, not a computed rotation.
Olive Green #808000
complementaryOlive Green sits directly opposite #421f89 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Powder Blue #b0e0e6
shippedPowder Blue is paired with #421f89 in 3 real palettes, including Glacier and First Snow, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #421f89
Tints & shades
Harmonies
Contrast
| #421f89 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.74:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.79:1 | 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 #421f89 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
#421f89 reads as cool, vivid, technical. 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 #421f89 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/421f89-ae9cc4-dfc94e-2a1f2d-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