Ledger Dark
Open in tool →Gold on midnight is the private-banking cue; the mint accent keeps it from feeling old-money stuffy.
Color
#42cd90
#42cd90
hex
#42cd90rgb
rgb(66, 205, 144)hsl
hsl(154, 58%, 53%)oklch
oklch(0.759 0.149 160.2)Closest name: Emerald Green (#50c878)Relative luminance 0.4683
Colors that go with #42cd90
Charcoal, Blue and Deep Sky 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 #42cd90: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shipped5 real palettes, including Unity's brand system and Minecraft's brand system put Blue beside #42cd90, as the supporting colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #42cd90: 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 Meadow put Mustard Yellow beside #42cd90, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #42cd90 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 #42cd90 in 17 real palettes, including Chime's brand system and WhatsApp's brand system, as the lead colour.
Violet #ee82ee
complementaryViolet sits directly opposite #42cd90 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 #42cd90: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #42cd90
Tints & shades
Harmonies
Contrast
| #42cd90 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.03:1 | fail | fail | fail | |
Aaon black | 10.37:1 | 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 #42cd90 as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #42cd90
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 #42cd90 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/42cd90-a2beb5-d459ca-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