Ink & Paper
Open in tool →Two greys and one ink-blue link color: the palette of a well-set book page.
Color
#646d68
#646d68
hex
#646d68rgb
rgb(100, 109, 104)hsl
hsl(147, 4%, 41%)oklch
oklch(0.525 0.013 161.7)Closest name: Armoury (#6a6b65)Relative luminance 0.1465
Colors that go with #646d68
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 #646d68 without the hard edge of pure #000.
Champagne #f7e7ce
shipped6 real palettes, including BrandSweets's brand system and Forest Floor put Champagne beside #646d68.
Copper #b87333
shippedDesigners have shipped Copper with #646d68: 8 real palettes, including Riverbed and Clay & Linen, as the accent.
Crimson #dc143c
shippedCrimson is paired with #646d68 in 7 real palettes, including Gemstone and Retro Pop, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #646d68: 9 real palettes, including Campus and Intel's brand system, as the lead colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #646d68 in 7 real palettes, including Mid-Century and Harvest, as the accent.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #646d68 in 4 real palettes, including Indigo SaaS and Undergrowth, as the accent.
Midnight Blue #191970
shipped7 real palettes, including Lufthansa's brand system and Paramount+'s brand system put Midnight Blue beside #646d68, as the lead colour.
Real palettes that use #646d68
Tints & shades
Harmonies
Contrast
| #646d68 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.34:1 | pass | pass | fail |
|
Aaon black | 3.93:1 | 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 #646d68 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
#646d68 reads as neutral, minimal. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #646d68
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 #646d68 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/646d68-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