Color
#21bcc4
#21bcc4rgb(33, 188, 196)hsl(183, 71%, 45%)oklch(0.725 0.118 200.5)Colors that go with #21bcc4
Charcoal, Blue and Denim 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 #21bcc4: 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 #21bcc4, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #21bcc4: 6 real palettes, including Coca-Cola's brand system and UEFA's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #21bcc4: 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 #21bcc4, as the lead colour.
Mustard Yellow #ffdb58
shipped4 real palettes, including Crayon Box and Lido put Mustard Yellow beside #21bcc4, as the accent.
Orange #ffa500
shipped4 real palettes, including Mint Modern and Mistral AI's brand system put Orange beside #21bcc4, as the accent.
Light Coral #f08080
complementaryLight Coral sits directly opposite #21bcc4 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #21bcc4
Tints & shades
Harmonies
Contrast
| #21bcc4 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.32:1 | fail | fail | fail | |
Aaon black | 9.06:1 | 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 #21bcc4 as the background.
Brands using this color
Fonts for this mood
#21bcc4 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 #21bcc4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21bcc4-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