Color
#421b64
#421b64rgb(66, 27, 100)hsl(272, 57%, 25%)oklch(0.321 0.123 304.8)Colors that go with #421b64
Charcoal, Royal Blue 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #421b64: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #421b64's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Crimson #dc143c
shippedCrimson is paired with #421b64 in 4 real palettes, including Casper Sleep's brand system and Marvel's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #421b64: 7 real palettes, including Hinge's brand system and Discover's brand system, as the accent.
Orange Red #ff4500
shippedOrange Red is paired with #421b64 in 4 real palettes, including Tumblr's brand system and Audi's brand system, as the accent.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #421b64: 5 real palettes, including Frost & Ember and Macaron, as the supporting colour.
Sky Blue #87ceeb
shippedSky Blue is paired with #421b64 in 4 real palettes, including Harbour and Boeing's brand system, as the supporting colour.
Slate Gray #708090
shipped4 real palettes, including Bloomberg's brand system and PlayStation® Official Site: Consoles, Games, Accessories & MoreSony Interactive Entertainment's brand system put Slate Gray beside #421b64, as the accent.
Real palettes that use #421b64
Tints & shades
Harmonies
Contrast
| #421b64 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.36:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.57:1 | 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 #421b64 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
#421b64 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 #421b64 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/421b64-b69cc4-c5cb62-2d1f2d-eae9f1?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