Color
#21808c
#21808crgb(33, 128, 140)hsl(187, 62%, 34%)oklch(0.552 0.086 207.6)Colors that go with #21808c
Charcoal, Crimson and Amber 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 #21808c: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
complementaryshippedCrimson sits directly opposite #21808c 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 #21808c in 4 real palettes, including Beach Hut and Lemon Squeezy's brand system, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #21808c: 6 real palettes, including Glacier and Fintech Trust, as the accent.
Copper #b87333
shippedDesigners have shipped Copper with #21808c: 7 real palettes, including Riverbed and Wellness, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #21808c: 5 real palettes, including Deep Water and Telegram's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #21808c: 15 real palettes, including Discover's brand system and Peacock, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #21808c: 4 real palettes, including Wendy's's brand system and Honda's brand system, as the supporting colour.
Real palettes that use #21808c
Tints & shades
Harmonies
Contrast
| #21808c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.63:1 | pass | pass | fail |
|
Aaon black | 4.53:1 | pass | 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 #21808c as the background.
Brands using this color
Fonts for this mood
#21808c 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 #21808c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21808c-a2b8be-df4e83-1f262d-e9f1ee?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