Color
#21d8fd
#21d8fdrgb(33, 216, 253)hsl(190, 98%, 56%)oklch(0.815 0.141 216.7)Colors that go with #21d8fd
Charcoal, Crimson and Dodger 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 #21d8fd: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
shippedCrimson is paired with #21d8fd in 4 real palettes, including Riot Games's brand system and Tiffany & Co.'s brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #21d8fd: 5 real palettes, including Patreon's brand system and Opensea's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #21d8fd in 9 real palettes, including Boeing's brand system and Crayon Box, as the text colour against it.
Salmon #fa8072
complementarySalmon sits directly opposite #21d8fd on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Dark Orange #ff8c00
split-complementshippedDark Orange is a split-complement of #21d8fd: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Light Coral #f08080
split-complementshippedLight Coral is a split-complement of #21d8fd: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue #0000ff
shipped3 real palettes, including Warp's brand system and Canva's brand system put Blue beside #21d8fd, as the supporting colour.
Real palettes that use #21d8fd
Tints & shades
Harmonies
Contrast
| #21d8fd as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.71:1 | fail | fail | fail | |
Aaon black | 12.31:1 | 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 #21d8fd as the background.
Brands using this color
Fonts for this mood
#21d8fd 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 #21d8fd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21d8fd-a2b6be-df4e7c-1f252d-e9f1ef?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