#646A55
Closest named color: Dim Gray (#696969). oklch(51.3% 0.033 120.5), rgb(100, 106, 85).
Aa
White text reads best on this color (5.62:1).
About this color
#646A55 is a medium-dark, muted yellow. In OKLCH its lightness is 51%, its chroma 0.033 and its hue 121°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dim Gray (#696969), ΔE 0.034 away. White text reads best on it, at 5.62:1.
| Hue family | Yellows |
| Lightness | medium-dark (51%) |
| Chroma | muted (0.033) |
| Temperature | in between |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.73:1 |
| White text | 5.62:1 |
Values
| HEX | #646A55 |
| RGB | rgb(100, 106, 85) |
| HSL | hsl(77, 11%, 37%) |
| OKLCH | oklch(51.3% 0.033 120.5) |
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 #646A55 | 5.62:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #646A55 | 3.73:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #646A55 text on white | 5.62:1 | AA | Lc 78.1 | Fine for body text |
| #646A55 text on black | 3.73:1 | AA large text | Lc -23.6 | 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
#BFC2B7
oklch(80.9% 0.016 119.2)
-
Step 400
400
#9EA392
oklch(70.7% 0.025 120.4)
-
Step 500
500
#868D77
oklch(63.1% 0.033 121.7)
-
Step 600
600
#707760
oklch(55.7% 0.035 121.3)
-
Step 700
700 (this color)
#646A55
oklch(51.3% 0.033 120.5)
-
Step 800
800
#4D5141
oklch(42.6% 0.026 118.9)
-
Step 900
900
#404337
oklch(37.6% 0.02 118.8)
-
Step 950
950
#252720
oklch(26.8% 0.013 120.2)
#646A55 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) | #6D6754 | 0.015 |
| Deuteranopia (no green cones) | #6C6756 | 0.015 |
| Tritanopia (no blue cones) | #666864 | 0.026 |
| Achromatopsia (no color) | #676767 | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646A55
#646A55
oklch(51.3% 0.033 120.5)
- #6A6377
#6A6377
oklch(51.3% 0.032 301.2)
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 #646A55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.034
- Dark Taupe #7F684E ΔE 0.042
- Dark Moss Green #606C38 ΔE 0.044
- Grey Brown #7F7053 ΔE 0.048
- Dirt Brown #836539 ΔE 0.056
- Slate #516572 ΔE 0.058
- Dull Brown #876E4B ΔE 0.059
- Dark Olive Green #556B2F ΔE 0.060
Use #646A55 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.