Color
#21f312
#21f312rgb(33, 243, 18)hsl(116, 90%, 51%)oklch(0.838 0.279 142.2)Colors that go with #21f312
Deep Sky Blue, Violet and Hot Pink 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
triadicshippedDeep Sky Blue completes a triad with #21f312 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Violet #ee82ee
complementaryViolet sits directly opposite #21f312 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Hot Pink #ff69b4
split-complementHot Pink is a split-complement of #21f312: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Charcoal #36454f
neutralCharcoal is the body-text near-black for #21f312: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Plum #dda0dd
split-complementPlum is a split-complement of #21f312: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Red #ff0000
shippedRed is paired with #21f312 in two real palettes: Gatorade's brand system and Wise's brand system, as the supporting colour.
Light Coral #f08080
triadicLight Coral completes a triad with #21f312 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Medium Aquamarine #66cdaa
analogousMedium Aquamarine is #21f312's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Real palettes that use #21f312
Tints & shades
Harmonies
Contrast
| #21f312 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.51:1 | fail | fail | fail | |
Aaon black | 13.89:1 | 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 #21f312 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 #21f312 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21f312-a2bea3-8f4edf-1f2d24-eef1e9?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