Color
#21b5ba
#21b5bargb(33, 181, 186)hsl(182, 70%, 43%)oklch(0.704 0.114 198.5)Colors that go with #21b5ba
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 #21b5ba: softer than #000 and cool enough to feel like part of the same palette.
Denim #1560bd
shippedDesigners have shipped Denim with #21b5ba: 7 real palettes, including Coca-Cola's brand system and Open House, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #21b5ba: 4 real palettes, including Unity's brand system and Patreon's brand system, as the lead colour.
Midnight Blue #191970
shipped8 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #21b5ba, as the lead colour.
Mustard Yellow #ffdb58
shipped4 real palettes, including Lido and Crayon Box put Mustard Yellow beside #21b5ba, as the accent.
Orange #ffa500
shipped4 real palettes, including Mint Modern and Mistral AI's brand system put Orange beside #21b5ba, as the accent.
Orange Red #ff4500
shippedOrange Red is paired with #21b5ba in 4 real palettes, including Cursor's brand system and Figma's brand system, as the lead colour.
Light Coral #f08080
complementaryLight Coral sits directly opposite #21b5ba 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 #21b5ba
Tints & shades
Harmonies
Contrast
| #21b5ba as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.5:1 | fail | fail | fail | |
Aaon black | 8.38:1 | 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 #21b5ba as the background.
Brands using this color
Fonts for this mood
#21b5ba 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 #21b5ba and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21b5ba-a2babe-d45990-1f272d-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