Indigo SaaS
Open in tool →The dependable indigo-and-emerald B2B pairing: indigo for primary actions, emerald reserved for success states.
Color
#28b888
#28b888
hex
#28b888rgb
rgb(40, 184, 136)hsl
hsl(160, 64%, 44%)oklch
oklch(0.698 0.137 164.9)Closest name: Bleached Olive (#55bb88)Relative luminance 0.3651
Colors that go with #28b888
Charcoal, Hot Pink and 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 #28b888: softer than #000 and cool enough to feel like part of the same palette.
Hot Pink #ff69b4
complementaryshippedHot Pink sits directly opposite #28b888 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped4 real palettes, including Unity's brand system and Spotify's brand system put Blue beside #28b888, as the supporting colour.
Cornflower Blue #6495ed
triadicshippedCornflower Blue completes a triad with #28b888 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Midnight Blue #191970
shipped5 real palettes, including Fintech Trust and Telehealth put Midnight Blue beside #28b888, as the text colour against it.
Mustard Yellow #ffdb58
shipped5 real palettes, including Fresh Juice and Diner put Mustard Yellow beside #28b888, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #28b888 in 6 real palettes, including Khan Academy's brand system and Brilliant's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #28b888 in 15 real palettes, including Chime's brand system and Undergrowth, as the lead colour.
Real palettes that use #28b888
Tints & shades
Harmonies
Contrast
| #28b888 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.53:1 | fail | fail | fail | |
Aaon black | 8.3:1 | 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 #28b888 as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #28b888
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 #28b888 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/28b888-a2beb8-d459be-1f2c2d-e9f1eb?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