Color
#21649c
#21649crgb(33, 100, 156)hsl(207, 65%, 37%)oklch(0.49 0.112 248)Colors that go with #21649c
Charcoal, Crimson 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #21649c: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #21649c — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Royal Blue #4169e1
analogousshippedRoyal Blue is #21649c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #21649c on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #21649c in 8 real palettes, including McDonald's's brand system and Lemon Squeezy's brand system, as the lead colour.
Blue #0000ff
shipped5 real palettes, including Activision's brand system and Tesco's brand system put Blue beside #21649c, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #21649c: 4 real palettes, including Coca-Cola's brand system and Gopro's brand system, as the supporting colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #21649c: 4 real palettes, including Venmo's brand system and Deep Water, as the supporting colour.
Real palettes that use #21649c
Tints & shades
Harmonies
Contrast
| #21649c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.24:1 | pass | pass | fail |
|
Aaon black | 3.37:1 | fail | pass | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21649c as the background.
Brands using this color
Fonts for this mood
#21649c 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 #21649c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21649c-9cadc4-df4e53-1f212d-e9f1f1?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