Color
#21bfd4
#21bfd4rgb(33, 191, 212)hsl(187, 73%, 48%)oklch(0.739 0.122 209.3)Colors that go with #21bfd4
Charcoal, Blue and Dark Orange 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 #21bfd4: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shipped4 real palettes, including Canva's brand system and Warp's brand system put Blue beside #21bfd4, as the accent.
Dark Orange #ff8c00
split-complementshippedDark Orange is a split-complement of #21bfd4: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Denim #1560bd
shippedDesigners have shipped Denim with #21bfd4: 5 real palettes, including UEFA's brand system and Coca-Cola's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #21bfd4: 5 real palettes, including Patreon's brand system and Figma's brand system, as the accent.
Midnight Blue #191970
shipped8 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #21bfd4, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21bfd4 in 9 real palettes, including Confluent's brand system and Elastic's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #21bfd4 in 8 real palettes, including Crayon Box and Cursor's brand system, as the text colour against it.
Real palettes that use #21bfd4
Tints & shades
Harmonies
Contrast
| #21bfd4 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.22:1 | fail | fail | fail | |
Aaon black | 9.47:1 | pass | pass | pass | Passes AAA — no fix needed. |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21bfd4 as the background.
Brands using this color
Fonts for this mood
#21bfd4 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 #21bfd4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21bfd4-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