Color
#511b7e
#511b7ergb(81, 27, 126)hsl(273, 65%, 30%)oklch(0.363 0.156 304.3)Colors that go with #511b7e
Midnight Blue, Royal Blue and Olive Green 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.
Midnight Blue #191970
shipped4 real palettes, including Gillette's brand system and Visa's brand system put Midnight Blue beside #511b7e, as the supporting colour.
Royal Blue #4169e1
analogousshippedRoyal Blue is #511b7e's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Olive Green #808000
complementaryOlive Green sits directly opposite #511b7e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #511b7e: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
shippedCrimson is paired with #511b7e in 3 real palettes, including Lenovo's brand system and Casper Sleep's brand system, as the supporting colour.
Steel Blue #4682b4
shippedDesigners have shipped Steel Blue with #511b7e: 3 real palettes, including Fintech Trust and Hershey's's brand system, as the supporting colour.
Tomato #ff6347
shipped3 real palettes, including dbt Labs's brand system and Golden Hour put Tomato beside #511b7e, as the lead colour.
Teal #008080
triadicshippedTeal completes a triad with #511b7e — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Real palettes that use #511b7e
Tints & shades
Harmonies
Contrast
| #511b7e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.62:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.81:1 | 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 #511b7e 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
#511b7e 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 #511b7e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/511b7e-b79cc4-c4cb62-2d1f2d-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