Lagoon
Open in tool →Turquoise and teal with a sand-yellow on white — shallow tropical water; the deep teal text is the reef.
Color
#42b8a4
#42b8a4
hex
#42b8a4rgb
rgb(66, 184, 164)hsl
hsl(170, 47%, 49%)oklch
oklch(0.711 0.109 179.7)Closest name: Emerald Bliss (#4cbdac)Relative luminance 0.3812
Colors that go with #42b8a4
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 #42b8a4: softer than #000 and cool enough to feel like part of the same palette.
Hot Pink #ff69b4
complementaryshippedHot Pink sits directly opposite #42b8a4 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 #42b8a4: 4 real palettes, including Canva's brand system and Terminal, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #42b8a4 in 4 real palettes, including DuckDuckGo's brand system and Diner, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #42b8a4: 4 real palettes, including Unity's brand system and Spline's brand system, as the lead colour.
Midnight Blue #191970
shipped7 real palettes, including Ford's brand system and Fintech Trust put Midnight Blue beside #42b8a4, as the lead colour.
Mustard Yellow #ffdb58
shipped5 real palettes, including Crayon Box and Diner put Mustard Yellow beside #42b8a4, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #42b8a4 in 5 real palettes, including Khan Academy's brand system and Brilliant's brand system, as the accent.
Real palettes that use #42b8a4
Tints & shades
Harmonies
Contrast
| #42b8a4 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.44:1 | fail | fail | fail | |
Aaon black | 8.62:1 | 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 #42b8a4 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 #42b8a4
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 #42b8a4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/42b8a4-a2bebd-d459a9-1f292d-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