#646B57
Closest named color: Dim Gray (#696969). oklch(51.6% 0.032 123.2), rgb(100, 107, 87).
Aa
White text reads best on this color (5.55:1).
About this color
#646B57 is a medium-dark, muted yellow. In OKLCH its lightness is 52%, its chroma 0.032 and its hue 123°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dim Gray (#696969), ΔE 0.032 away. White text reads best on it, at 5.55:1.
| Hue family | Yellows |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.032) |
| Temperature | in between |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.78:1 |
| White text | 5.55:1 |
Values
| HEX | #646B57 |
| RGB | rgb(100, 107, 87) |
| HSL | hsl(81, 10%, 38%) |
| OKLCH | oklch(51.6% 0.032 123.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #646B57 | 5.55:1 | AA | Lc -83.0 | Fine for body text |
| Black text on #646B57 | 3.78:1 | AA large text | Lc 26.3 | Dividers and decoration only |
| #646B57 text on white | 5.55:1 | AA | Lc 77.8 | Fine for body text |
| #646B57 text on black | 3.78:1 | AA large text | Lc -24.0 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F5F6F4
oklch(97.2% 0.003 128.5)
-
Step 100
100
#E9EAE7
oklch(93.5% 0.004 121.6)
-
Step 200
200
#D8DAD4
oklch(88.5% 0.008 121.6)
-
Step 300
300
#BEC2B8
oklch(80.8% 0.014 124.6)
-
Step 400
400
#9DA393
oklch(70.6% 0.024 123.8)
-
Step 500
500
#868D78
oklch(63.2% 0.032 122.3)
-
Step 600
600
#6F7761
oklch(55.6% 0.034 123.8)
-
Step 700
700 (this color)
#646B57
oklch(51.6% 0.032 123.2)
-
Step 800
800
#4C5242
oklch(42.8% 0.027 124.2)
-
Step 900
900
#3F4438
oklch(37.8% 0.021 125.8)
-
Step 950
950
#252821
oklch(27.1% 0.013 126.2)
#646B57 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #6E6856 | 0.017 |
| Deuteranopia (no green cones) | #6D6858 | 0.016 |
| Tritanopia (no blue cones) | #666965 | 0.025 |
| Achromatopsia (no color) | #686868 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646B57
#646B57
oklch(51.6% 0.032 123.2)
- #6B6477
#6B6477
oklch(51.6% 0.031 302.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #646B57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.032
- Dark Taupe #7F684E ΔE 0.042
- Dark Moss Green #606C38 ΔE 0.045
- Grey Brown #7F7053 ΔE 0.046
- Dirt Brown #836539 ΔE 0.057
- Slate #516572 ΔE 0.057
- Dull Brown #876E4B ΔE 0.058
- Battleship Gray #6C757D ΔE 0.060
Use #646B57 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.