Mellow Manatee
Mellow Manatee (#0B1804) is a deep lime with a jewel character. It carries the deep, saturated richness of a gemstone. Authoritative and slightly formal, it works well for type and heavy UI elements. Its HSL profile (99°, 71%, 5%) places it in the balanced band at a dark lightness. It works well as a headline, icon, or deep background in an otherwise light layout, pairing cleanly with cream, bone, and warm neutrals. For a confident two-color system, pair it with its complementary indigo. For something softer, pull in its analogous neighbors on either side of the wheel.
Etymology
Middle English melwe, ripe, soft — used as a color modifier since the sixteenth century for hues that read as softened by ripening or aging. Mellow gold, mellow brown: moderate-to-low saturation combined with optical warmth. Sits across the hushed and neutral buckets alongside muted.
Caribbean Trichechus manatus — a Trichechidae sirenian aquatic mammal of Florida-Keys and Caribbean coastal-estuarine habitats, with deep-mottled-gray-brown skin. Manatee color refers to a Trichechus manatus dorsal-skin in raking sun on the St-Johns-River: a dark cool-gray with the matte finish of folded-and-leathery sirenian skin with multi-decade saltwater-and-algal-growth patina.
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.