Ledger Dark
Open in tool →Gold on midnight is the private-banking cue; the mint accent keeps it from feeling old-money stuffy.
Color
#51d69f
#51d69f
hex
#51d69frgb
rgb(81, 214, 159)hsl
hsl(155, 62%, 58%)oklch
oklch(0.789 0.141 162.6)Closest name: Envy’s Love (#2dd78d)Relative luminance 0.5235
Colors that go with #51d69f
Charcoal, Hot Pink and 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 #51d69f: softer than #000 and cool enough to feel like part of the same palette.
Hot Pink #ff69b4
complementaryshippedHot Pink sits directly opposite #51d69f on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped6 real palettes, including Unity's brand system and Minecraft's brand system put Blue beside #51d69f, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #51d69f in 4 real palettes, including Tiffany & Co.'s brand system and Formula 1's brand system, as the supporting colour.
Mustard Yellow #ffdb58
shipped4 real palettes, including Fresh Juice and Crayon Box put Mustard Yellow beside #51d69f, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #51d69f in 4 real palettes, including Docker's brand system and Khan Academy's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #51d69f in 19 real palettes, including Chime's brand system and WhatsApp's brand system, as the lead colour.
Light Coral #f08080
split-complementshippedLight Coral is a split-complement of #51d69f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #51d69f
Tints & shades
Harmonies
Contrast
| #51d69f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.83:1 | fail | fail | fail | |
Aaon black | 11.47:1 | 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 #51d69f as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #51d69f
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 #51d69f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/51d69f-a2beb6-d459c8-1f2d2d-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