Color
#5b2178
#5b2178rgb(91, 33, 120)hsl(280, 57%, 30%)oklch(0.378 0.145 312)Colors that go with #5b2178
Sea Green, 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.
Sea Green #2e8b57
complementarySea Green sits directly opposite #5b2178 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 #5b2178: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
shippedCrimson is paired with #5b2178 in 3 real palettes, including Lenovo's brand system and Casper Sleep's brand system, as the supporting colour.
Tomato #ff6347
shipped3 real palettes, including Golden Hour and dbt Labs's brand system put Tomato beside #5b2178, as the supporting colour.
Teal #008080
triadicshippedTeal completes a triad with #5b2178 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Olive Green #808000
split-complementOlive Green is a split-complement of #5b2178: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Slate Blue #6a5acd
analogousshippedSlate Blue is #5b2178's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Denim #1560bd
shippedDesigners have shipped Denim with #5b2178: two real palettes: Hinge's brand system and Slack's brand system, as the accent.
Real palettes that use #5b2178
Tints & shades
Harmonies
Contrast
| #5b2178 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.86:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.93:1 | 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 #5b2178 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
#5b2178 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 #5b2178 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/5b2178-b99fc1-b8cb62-2d1f2c-ebe9f1?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