Color
#21e499
#21e499rgb(33, 228, 153)hsl(157, 78%, 51%)oklch(0.813 0.179 160)Colors that go with #21e499
Deep Sky Blue, Mustard Yellow and Royal 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.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #21e499: 4 real palettes, including Remix's brand system and Prime Video's brand system, as the lead colour.
Mustard Yellow #ffdb58
shipped4 real palettes, including Fresh Juice and Citrus Grove put Mustard Yellow beside #21e499, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21e499 in 4 real palettes, including Docker's brand system and MongoDB's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #21e499 in 9 real palettes, including 7-Eleven's brand system and Astro's brand system, as the lead colour.
Violet #ee82ee
complementaryViolet sits directly opposite #21e499 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 #21e499: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #21e499: softer than #000 and cool enough to feel like part of the same palette.
Dark Orange #ff8c00
shippedDark Orange shows up next to #21e499 in 3 real palettes, including Playground and Citrus Grove, as the lead colour.
Real palettes that use #21e499
Tints & shades
Harmonies
Contrast
| #21e499 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.66:1 | fail | fail | fail | |
Aaon black | 12.62:1 | 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 #21e499 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 #21e499 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21e499-a2beb7-d459c4-1f2c2d-e9f1ea?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