Color
#21bde4
#21bde4rgb(33, 189, 228)hsl(192, 78%, 51%)oklch(0.741 0.13 220.7)Colors that go with #21bde4
Charcoal, Denim 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 #21bde4: softer than #000 and cool enough to feel like part of the same palette.
Denim #1560bd
shippedDesigners have shipped Denim with #21bde4: 5 real palettes, including Venmo's brand system and Coca-Cola's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #21bde4: 4 real palettes, including Figma's brand system and Patreon's brand system, as the accent.
Midnight Blue #191970
shipped8 real palettes, including Confluent's brand system and Kraken's brand system put Midnight Blue beside #21bde4, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21bde4 in 8 real palettes, including Confluent's brand system and Elastic's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #21bde4 in 9 real palettes, including Cursor's brand system and Astro's brand system, as the text colour against it.
Coral #ff7f50
complementaryCoral sits directly opposite #21bde4 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Light Coral #f08080
split-complementshippedLight Coral is a split-complement of #21bde4: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #21bde4
Tints & shades
Harmonies
Contrast
| #21bde4 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.22:1 | fail | fail | fail | |
Aaon black | 9.46:1 | 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 #21bde4 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#21bde4 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 #21bde4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21bde4-a2b5be-df4e77-1f242d-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