Indigo SaaS
Open in tool →The dependable indigo-and-emerald B2B pairing: indigo for primary actions, emerald reserved for success states.
Color
#666c7f
#666c7f
hex
#666c7frgb
rgb(102, 108, 127)hsl
hsl(226, 11%, 45%)oklch
oklch(0.533 0.031 271.5)Closest name: Ashen Whisper (#646b7a)Relative luminance 0.1508
Colors that go with #666c7f
Charcoal, Amber and Champagne 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 #666c7f: softer than #000 and cool enough to feel like part of the same palette.
Amber #ffbf00
shippedAmber is paired with #666c7f in 4 real palettes, including Beach Hut and Lemon Squeezy's brand system, as the supporting colour.
Champagne #f7e7ce
shipped6 real palettes, including BrandSweets's brand system and Coffee Bar put Champagne beside #666c7f.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #666c7f: 5 real palettes, including Ink & Paper and Fintech Trust, as the accent.
Copper #b87333
shippedDesigners have shipped Copper with #666c7f: 6 real palettes, including Riverbed and Dusk, as the accent.
Crimson #dc143c
shippedCrimson is paired with #666c7f in 10 real palettes, including Retro Pop and Wendy's's brand system, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #666c7f: 4 real palettes, including Deep Water and Venmo's brand system, as the lead colour.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #666c7f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Real palettes that use #666c7f
Tints & shades
Harmonies
Contrast
| #666c7f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.23:1 | pass | pass | fail |
|
Aaon black | 4.02:1 | fail | pass | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #666c7f 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 #666c7f
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 #666c7f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/666c7f-9ca1c4-df774e-221f2d-e9eff1?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