Indigo SaaS
Open in tool →The dependable indigo-and-emerald B2B pairing: indigo for primary actions, emerald reserved for success states.
Color
#18b478
#18b478
hex
#18b478rgb
rgb(24, 180, 120)hsl
hsl(157, 76%, 40%)oklch
oklch(0.681 0.149 160)Closest name: mediumseagreen (#3cb371)Relative luminance 0.3419
Colors that go with #18b478
Charcoal, Blue 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 #18b478: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shipped4 real palettes, including Unity's brand system and Spotify's brand system put Blue beside #18b478, as the supporting colour.
Cornflower Blue #6495ed
triadicshippedCornflower Blue completes a triad with #18b478 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Midnight Blue #191970
shipped4 real palettes, including Fintech Trust and Telehealth put Midnight Blue beside #18b478, as the text colour against it.
Mustard Yellow #ffdb58
shipped4 real palettes, including Meadow and Diner put Mustard Yellow beside #18b478, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #18b478 in 5 real palettes, including Khan Academy's brand system and Console Light, as the accent.
Taupe #483c32
shippedTaupe is paired with #18b478 in 11 real palettes, including Chime's brand system and Obsidian's brand system, as the lead colour.
Deep Pink #ff1493
complementaryDeep Pink sits directly opposite #18b478 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #18b478
Tints & shades
Harmonies
Contrast
| #18b478 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.68:1 | fail | fail | fail | |
Aaon black | 7.84:1 | 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 #18b478 as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #18b478
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 #18b478 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/18b478-a2beb7-d459c4-1f2c2d-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