Color
#21877c
#21877crgb(33, 135, 124)hsl(174, 61%, 33%)oklch(0.565 0.091 184.2)Colors that go with #21877c
Charcoal, Medium Violet Red and Cobalt 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 #21877c: softer than #000 and cool enough to feel like part of the same palette.
Medium Violet Red #c71585
complementaryshippedMedium Violet Red sits directly opposite #21877c on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #21877c: 5 real palettes, including Intel's brand system and Ink & Paper, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #21877c: 6 real palettes, including Wellness and Riverbed, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #21877c in 8 real palettes, including Redfin's brand system and Gemstone, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #21877c: 10 real palettes, including Peacock and Intel's brand system, as the supporting colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #21877c in 5 real palettes, including Mid-Century and Sapphire & Gold, as the accent.
Midnight Blue #191970
shipped7 real palettes, including Tide Pool and Paramount+'s brand system put Midnight Blue beside #21877c, as that palette's text colour.
Real palettes that use #21877c
Tints & shades
Harmonies
Contrast
| #21877c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.36:1 | fail | pass | fail | |
Aaon black | 4.82:1 | 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 #21877c as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
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 #21877c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21877c-a2bebe-d459a1-1f292d-e9f1ed?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