Lagoon
Open in tool →Turquoise and teal with a sand-yellow on white — shallow tropical water; the deep teal text is the reef.
Color
#21baae
#21baae
hex
#21baaergb
rgb(33, 186, 174)hsl
hsl(175, 70%, 43%)oklch
oklch(0.713 0.119 186.4)Closest name: lightseagreen (#20b2aa)Relative luminance 0.385
Colors that go with #21baae
Charcoal, Denim and Midnight 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 #21baae: softer than #000 and cool enough to feel like part of the same palette.
Denim #1560bd
shippedDesigners have shipped Denim with #21baae: 4 real palettes, including Open House and Peacock, as the lead colour.
Midnight Blue #191970
shipped7 real palettes, including Ford's brand system and Confluent's brand system put Midnight Blue beside #21baae, as the accent.
Mustard Yellow #ffdb58
shipped4 real palettes, including Crayon Box and Lido put Mustard Yellow beside #21baae, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21baae in 5 real palettes, including Khan Academy's brand system and Brilliant's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #21baae in 10 real palettes, including Crayon Box and Resort, as the text colour against it.
Pale Violet Red #db7093
complementaryPale Violet Red sits directly opposite #21baae on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped3 real palettes, including Unity's brand system and Warp's brand system put Blue beside #21baae, as the supporting colour.
Real palettes that use #21baae
Tints & shades
Harmonies
Contrast
| #21baae as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.41:1 | fail | fail | fail | |
Aaon black | 8.7:1 | 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 #21baae as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #21baae
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #21baae and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21baae-a2bdbe-d4599f-1f282d-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