Color
#421c73
#421c73rgb(66, 28, 115)hsl(266, 61%, 28%)oklch(0.335 0.14 298.4)Colors that go with #421c73
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 #421c73: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #421c73'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 #421c73 in 5 real palettes, including Casper Sleep's brand system and Marvel's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #421c73: 7 real palettes, including Panasonic's brand system and Hinge's brand system, as the accent.
Steel Blue #4682b4
shippedDesigners have shipped Steel Blue with #421c73: 6 real palettes, including FedEx's brand system and Hershey's's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #421c73 in 4 real palettes, including Gillette's brand system and American Eagle's brand system, as the lead colour.
Tomato #ff6347
shipped4 real palettes, including FedEx's brand system and dbt Labs's brand system put Tomato beside #421c73, as the supporting colour.
Olive Green #808000
complementaryOlive Green sits directly opposite #421c73 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #421c73
Tints & shades
Harmonies
Contrast
| #421c73 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 12.76:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.65:1 | 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 #421c73 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
#421c73 reads as cool, vivid, 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 #421c73 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/421c73-b29cc4-dfd74e-2b1f2d-e9eaf1?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