Indigo SaaS
Open in tool →The dependable indigo-and-emerald B2B pairing: indigo for primary actions, emerald reserved for success states.
Color
#42b877
#42b877
hex
#42b877rgb
rgb(66, 184, 119)hsl
hsl(147, 47%, 49%)oklch
oklch(0.7 0.143 155.5)Closest name: mediumseagreen (#3cb371)Relative luminance 0.3677
Colors that go with #42b877
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 text near-black for #42b877: softer than #000 and cool enough to feel like part of the same palette.
Mustard Yellow #ffdb58
shipped5 real palettes, including Meadow and Fresh Juice put Mustard Yellow beside #42b877, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #42b877 in 5 real palettes, including Khan Academy's brand system and Brilliant's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #42b877 in 13 real palettes, including Chime's brand system and Undergrowth, as the lead colour.
Orchid #da70d6
complementaryOrchid sits directly opposite #42b877 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
triadicshippedCornflower Blue completes a triad with #42b877 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Dark Olive Green #556b2f
shippedDark Olive Green shows up next to #42b877 in 3 real palettes, including Undergrowth and Forest Floor, as the supporting colour.
Dark Orange #ff8c00
shippedDark Orange shows up next to #42b877 in 3 real palettes, including Playground and Citrus Grove, as the lead colour.
Real palettes that use #42b877
Tints & shades
Harmonies
Contrast
| #42b877 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.51:1 | fail | fail | fail | |
Aaon black | 8.35:1 | 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 #42b877 as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #42b877
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 #42b877 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/42b877-a2beb2-d059d4-1f2d2c-eaf1e9?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