Shaker Boulder
Shaker Boulder (#647879) is a true cyan with an earthy character. It leans grounded and natural, the kind of color that plays well with wood, clay, linen, and warm neutrals. Its HSL profile (183°, 10%, 43%) places it in the muted band at a mid lightness. It works across type, buttons, and borders, saturated enough to feel deliberate but balanced enough to not fight the rest of the palette. For a confident two-color system, pair it with its complementary red. For something softer, pull in its analogous neighbors on either side of the wheel.
Etymology
English Shaker, United-Society-of-Believers-in-Christ's-Second-Appearing — adjectival usage of Shaker. As a color modifier, shaker implies a neutral-and-plain-and-stripped-down quality, the neutral color of Shaker-furniture-and-craft anti-ornamental-and-functional hand-built-and-precise-craft surface-finish. Sits at the neutral-and-stripped-down end of the grid, parallel to quakerly and plain in usage.
A rock mass larger than 25.6 cm in diameter (the geological size cutoff) — typically water- or glacier-deposited and often used as a reference unit for glacial erratics. The color refers to a granitic boulder in a New England pasture: a soft, slightly muted mid-gray with the matte finish of weathered exposed stone. Warmer than slate, cooler than stone, with the landscape weight of a feature that defines a field for centuries.
Closest matches
The nearest named color in three reference sources, ranked by perceptual distance (ΔE76 in CIELAB). ΔE < 1 is imperceptible to most viewers; ΔE > 10 is clearly different. When two sources point to the same hex they’re merged into one tile; click any to open that color’s page.
Variations
Click any swatch to exploreHarmonies
Accessibility
How this color appears to viewers with the four major color-vision-deficiency types. Computed via the Machado (2009) physiologically-based model. If a tile matches the original, the color reads the same to that viewer.
The color used as foreground text against pure white and pure black, with the contrast ratio and WCAG 2.1 grade. Aim for AA (4.5:1) for body text and AA Large (3:1) for 18 pt+ headlines; AAA (7:1) is the gold standard for long-form reading surfaces.
Wide gamut
The CSS Color 4 wide-gamut form of this color. Both swatches render the same color on every display — the P3 form only diverges from sRGB when a designer pushes channels outside sRGB's reach.
This color sits well within the sRGB cube. P3 and sRGB share the gray axis and most desaturated tones, so a P3 display renders this identically to an sRGB display.