Color
#3f686e
#3f686ergb(63, 104, 110)hsl(188, 27%, 34%)oklch(0.49 0.047 207.5)Colors that go with #3f686e
Charcoal, Sienna and Cadet 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 #3f686e: softer than #000 and cool enough to feel like part of the same palette.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #3f686e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Cadet Blue #5f9ea0
shippedCadet Blue is paired with #3f686e in 4 real palettes, including Alpine and Open House, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Copper #b87333
shippedCopper is paired with #3f686e in 5 real palettes, including Desert Road and Dusk, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Crimson #dc143c
shippedCrimson is paired with #3f686e in 4 real palettes, including Gemstone and Retro Pop, as the accent — a combination designers have actually shipped, not a computed rotation.
Goldenrod #daa520
shippedGoldenrod is paired with #3f686e in 4 real palettes, including Mid-Century and Fireside, as the accent — a combination designers have actually shipped, not a computed rotation.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #3f686e in 5 real palettes, including Undergrowth and Console Light, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Royal Blue #4169e1
shippedRoyal Blue is paired with #3f686e in 6 real palettes, including GitHub's brand system and Stripe's brand system, as the accent — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #3f686e
Tints & shades
Harmonies
Contrast
| #3f686e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.15:1 | pass | pass | fail |
|
Aaon black | 3.42:1 | 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 #3f686e as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #3f686e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f686e-a2b7be-df4e81-1f252d-e9f1ee?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