Ink & Paper
Open in tool →Two greys and one ink-blue link color: the palette of a well-set book page.
Color
#666a70
#666a70
hex
#666a70rgb
rgb(102, 106, 112)hsl
hsl(216, 5%, 42%)oklch
oklch(0.523 0.011 258.4)Closest name: Alley Cat (#656874)Relative luminance 0.143
Colors that go with #666a70
Charcoal, Champagne and Copper 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 that reads cleanly against #666a70 without the hard edge of pure #000.
Champagne #f7e7ce
shipped7 real palettes, including BrandSweets's brand system and Coffee Bar put Champagne beside #666a70.
Copper #b87333
shippedDesigners have shipped Copper with #666a70: 8 real palettes, including Riverbed and Clay & Linen, as the accent.
Crimson #dc143c
shippedCrimson is paired with #666a70 in 6 real palettes, including Retro Pop and Gemstone, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #666a70: 10 real palettes, including Campus and The New York Times's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #666a70: 4 real palettes, including Newsprint and Fireside, as the lead colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #666a70 in 7 real palettes, including Mid-Century and Open House, as the accent.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #666a70 in 4 real palettes, including Indigo SaaS and Undergrowth, as the accent.
Real palettes that use #666a70
Tints & shades
Harmonies
Contrast
| #666a70 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.44:1 | pass | pass | fail |
|
Aaon black | 3.86:1 | 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 #666a70 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
Fonts for this mood
#666a70 reads as neutral, minimal. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #666a70
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 #666a70 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/666a70-a2beb0-c859d4-1f2d2b-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