Color
#51d665
#51d665rgb(81, 214, 101)hsl(129, 62%, 58%)oklch(0.778 0.193 146.1)Colors that go with #51d665
Blue, Royal Blue and Taupe 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.
Blue #0000ff
shipped4 real palettes, including Minecraft's brand system and MongoDB's brand system put Blue beside #51d665, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #51d665 in 4 real palettes, including Brilliant's brand system and Docker's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #51d665 in 9 real palettes, including WhatsApp's brand system and 7-Eleven's brand system, as the supporting colour.
Violet #ee82ee
complementaryViolet sits directly opposite #51d665 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-complementshippedHot Pink is a split-complement of #51d665: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #51d665: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Cornflower Blue #6495ed
triadicshippedCornflower Blue completes a triad with #51d665 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Dark Orange #ff8c00
shippedDark Orange shows up next to #51d665 in 3 real palettes, including Learning App and Playground, as the accent.
Real palettes that use #51d665
Tints & shades
Harmonies
Contrast
| #51d665 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.88:1 | fail | fail | fail | |
Aaon black | 11.16:1 | 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 #51d665 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 #51d665 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51d665-a2bea9-ae4edf-1f2d27-ecf1e9?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