Color
#5121ca
#5121cargb(81, 33, 202)hsl(257, 72%, 46%)oklch(0.442 0.232 284.7)Colors that go with #5121ca
Olive Green, Charcoal and Royal Blue 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.
Olive Green #808000
complementaryOlive Green sits directly opposite #5121ca 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 #5121ca: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #5121ca's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Slate Gray #708090
shippedSlate Gray is paired with #5121ca in 3 real palettes, including Indigo SaaS and Ink & Paper, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Forest Green #228b22
split-complementForest Green is a split-complement of #5121ca: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Dark Orchid #9932cc
analogousshippedDark Orchid is #5121ca's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
split-complementSienna is a split-complement of #5121ca: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Midnight Blue #191970
shippedMidnight Blue is paired with #5121ca in two real palettes: Blue Mono and Monzo's brand system, as the text colour against it — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #5121ca
Tints & shades
Harmonies
Contrast
| #5121ca as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.68:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.42:1 | 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 #5121ca 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
#5121ca 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 #5121ca and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/5121ca-ac9cc4-dfc24e-291f2d-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