Color
#21ab9d
#21ab9drgb(33, 171, 157)hsl(174, 68%, 40%)oklch(0.669 0.112 184.2)Colors that go with #21ab9d
Charcoal, Cornflower 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 #21ab9d: softer than #000 and cool enough to feel like part of the same palette.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #21ab9d: 4 real palettes, including Canva's brand system and Arctic, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #21ab9d: 4 real palettes, including Peacock and Open House, as the supporting colour.
Midnight Blue #191970
shipped7 real palettes, including Ford's brand system and Tide Pool put Midnight Blue beside #21ab9d, as the lead colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21ab9d in 6 real palettes, including Khan Academy's brand system and Confluent's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #21ab9d in 14 real palettes, including Resort and Rain Garden, as the text colour against it.
Deep Pink #ff1493
complementaryDeep Pink sits directly opposite #21ab9d on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Tomato #ff6347
split-complementshippedTomato is a split-complement of #21ab9d: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #21ab9d
Tints & shades
Harmonies
Contrast
| #21ab9d as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.85:1 | fail | fail | fail | |
Aaon black | 7.38:1 | 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 #21ab9d as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
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 #21ab9d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21ab9d-a2bebe-d459a1-1f292d-e9f1ed?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