Lagoon
Open in tool →Turquoise and teal with a sand-yellow on white — shallow tropical water; the deep teal text is the reef.
Color
#40b59c
#40b59c
hex
#40b59crgb
rgb(64, 181, 156)hsl
hsl(167, 48%, 48%)oklch
oklch(0.701 0.111 176)Closest name: Electra (#55b492)Relative luminance 0.3654
Colors that go with #40b59c
Charcoal, Hot Pink and Cornflower 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 #40b59c: softer than #000 and cool enough to feel like part of the same palette.
Hot Pink #ff69b4
complementaryshippedHot Pink sits directly opposite #40b59c on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #40b59c: 4 real palettes, including Canva's brand system and Terminal, as the supporting colour.
Midnight Blue #191970
shipped8 real palettes, including Fintech Trust and Ford's brand system put Midnight Blue beside #40b59c, as the text colour against it.
Mustard Yellow #ffdb58
shipped5 real palettes, including Diner and Crayon Box put Mustard Yellow beside #40b59c, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #40b59c in 6 real palettes, including Khan Academy's brand system and Brilliant's brand system, as the accent.
Slate Gray #708090
shipped4 real palettes, including Indigo SaaS and Ledger Dark put Slate Gray beside #40b59c, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #40b59c in 18 real palettes, including Resort and Undergrowth, as the text colour against it.
Real palettes that use #40b59c
Tints & shades
Harmonies
Contrast
| #40b59c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.53:1 | fail | fail | fail | |
Aaon black | 8.31:1 | 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 #40b59c as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
mcpConnect your agent — build around #40b59c
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 #40b59c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/40b59c-a2bebb-d459af-1f2a2d-e9f1ec?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