Color
#21099a
#21099argb(33, 9, 154)hsl(250, 89%, 32%)oklch(0.33 0.203 272.9)Colors that go with #21099a
Royal Blue, Steel 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.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21099a in 4 real palettes, including Discord's brand system and Nivea's brand system, as the lead colour.
Steel Blue #4682b4
analogousshippedSteel Blue is #21099a'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 #21099a on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped3 real palettes, including Pepsi's brand system and Pfizer's brand system put Blue beside #21099a, as the supporting colour.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #21099a: softer than #000 and cool enough to feel like part of the same palette.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #21099a: 3 real palettes, including Tide's brand system and Purina Pro Plan's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #21099a in 3 real palettes, including Nintendo's brand system and Casper Sleep's brand system, as the supporting colour.
Sienna #a0522d
split-complementSienna is a split-complement of #21099a: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #21099a
Tints & shades
Harmonies
Contrast
| #21099a as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.37:1 | 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 #21099a 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
#21099a 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 #21099a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21099a-a79cc4-dfb14e-281f2d-e9ecf1?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