#646D21
Closest named color: Browny Green (#6F6C0A). oklch(51.1% 0.099 115.8), rgb(100, 109, 33).
Aa
White text reads best on this color (5.59:1).
About this color
#646D21 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 51%, its chroma 0.099 and its hue 116°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Browny Green (#6F6C0A), ΔE 0.018 away. White text reads best on it, at 5.59:1.
| Hue family | Yellows |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.099) |
| Temperature | in between |
| Nearest name | Browny Green (#6F6C0A) |
| Black text | 3.75:1 |
| White text | 5.59:1 |
Values
| HEX | #646D21 |
| RGB | rgb(100, 109, 33) |
| HSL | hsl(67, 54%, 28%) |
| OKLCH | oklch(51.1% 0.099 115.8) |
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 #646D21 | 5.59:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #646D21 | 3.75:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #646D21 text on white | 5.59:1 | AA | Lc 77.9 | Fine for body text |
| #646D21 text on black | 3.75:1 | AA large text | Lc -23.9 | 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
#F5F6F1
oklch(97.1% 0.007 115.7)
-
Step 100
100
#E9EBE1
oklch(93.6% 0.013 115.8)
-
Step 200
200
#D8DCC8
oklch(88.6% 0.027 116.1)
-
Step 300
300
#BFC5A2
oklch(80.9% 0.048 115.4)
-
Step 400
400
#9EA76F
oklch(70.7% 0.077 115.8)
-
Step 500
500
#879148
oklch(63.2% 0.098 115.7)
-
Step 600
600
#717B28
oklch(55.7% 0.107 115.8)
-
Step 700
700 (this color)
#646D21
oklch(51.1% 0.099 115.8)
-
Step 800
800
#4D5418
oklch(42.7% 0.082 115.7)
-
Step 900
900
#40461B
oklch(37.8% 0.064 116.2)
-
Step 950
950
#252911
oklch(27% 0.04 117)
#646D21 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) | #756716 | 0.029 |
| Deuteranopia (no green cones) | #746826 | 0.030 |
| Tritanopia (no blue cones) | #6A675E | 0.086 |
| Achromatopsia (no color) | #686868 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646D21
#646D21
oklch(51.1% 0.099 115.8)
- #6C5A99
#6C5A99
oklch(51.3% 0.099 295.9)
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 #646D21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Browny Green #6F6C0A ΔE 0.018
- Brown Green #706C11 ΔE 0.019
- Muddy Green #657432 ΔE 0.022
- Dark Moss Green #606C38 ΔE 0.024
- Mud Green #606602 ΔE 0.025
- Dark Olive Green #556B2F ΔE 0.025
- Greeny Brown #696006 ΔE 0.036
- Camo Green #526525 ΔE 0.038
Use #646D21 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.