Color
#21dae4
#21dae4rgb(33, 218, 228)hsl(183, 78%, 51%)oklch(0.81 0.133 200.9)Colors that go with #21dae4
Charcoal, Light Coral and Crimson 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 #21dae4: softer than #000 and cool enough to feel like part of the same palette.
Light Coral #f08080
complementaryshippedLight Coral sits directly opposite #21dae4 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Crimson #dc143c
shippedCrimson is paired with #21dae4 in 4 real palettes, including Tiffany & Co.'s brand system and Riot Games's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #21dae4: 4 real palettes, including Patreon's brand system and Opensea's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #21dae4 in 11 real palettes, including Crayon Box and Boeing's brand system, as the text colour against it.
Dark Orange #ff8c00
split-complementshippedDark Orange is a split-complement of #21dae4: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue #0000ff
shipped3 real palettes, including Canva's brand system and Uber's brand system put Blue beside #21dae4, as the accent.
Khaki #f0e68c
shipped3 real palettes, including Pastel Pop and Nursery put Khaki beside #21dae4, as the accent.
Real palettes that use #21dae4
Tints & shades
Harmonies
Contrast
| #21dae4 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.72:1 | fail | fail | fail | |
Aaon black | 12.21:1 | 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 #21dae4 as the background.
Brands using this color
Fonts for this mood
#21dae4 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 #21dae4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21dae4-a2b9be-d4598e-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