Color
#40b561
#40b561rgb(64, 181, 97)hsl(137, 48%, 48%)oklch(0.687 0.16 149.4)Colors that go with #40b561
Charcoal, 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.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #40b561: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Mustard Yellow #ffdb58
shipped4 real palettes, including Meadow and Citrus Grove put Mustard Yellow beside #40b561, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #40b561 in 5 real palettes, including Console Light and Telehealth, as the lead colour.
Taupe #483c32
shippedTaupe is paired with #40b561 in 11 real palettes, including Chime's brand system and Obsidian's brand system, as the lead colour.
Fuchsia #ff00ff
complementaryFuchsia sits directly opposite #40b561 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Medium Purple #9370db
split-complementshippedMedium Purple is a split-complement of #40b561: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue #0000ff
shipped3 real palettes, including Spotify's brand system and Unity's brand system put Blue beside #40b561, as the accent.
Cornflower Blue #6495ed
triadicshippedCornflower Blue completes a triad with #40b561 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Real palettes that use #40b561
Tints & shades
Harmonies
Contrast
| #40b561 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.62:1 | fail | fail | fail | |
Aaon black | 8:1 | 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 #40b561 as the background.
Brands using this color
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 #40b561 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/40b561-a2bead-bb59d4-1f2d29-ebf1e9?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