#639431
Closest named color: Olive Drab (#6B8E23). oklch(61.1% 0.14 131.9), rgb(99, 148, 49).
Aa
Black text reads best on this color (5.81:1).
About this color
#639431 is a medium-dark, moderately saturated green. In OKLCH its lightness is 61%, its chroma 0.140 and its hue 132°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Olive Drab (#6B8E23), ΔE 0.018 away. Black text reads best on it, at 5.81:1.
| Hue family | Greens |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.140) |
| Temperature | in between |
| Nearest name | Olive Drab (#6B8E23) |
| Black text | 5.81:1 |
| White text | 3.61:1 |
Values
| HEX | #639431 |
| RGB | rgb(99, 148, 49) |
| HSL | hsl(90, 50%, 39%) |
| OKLCH | oklch(61.1% 0.14 131.9) |
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 #639431 | 3.61:1 | AA large text | Lc -69.1 | Content text, not long reading |
| Black text on #639431 | 5.81:1 | AA | Lc 40.5 | Non-text elements, placeholder text |
| #639431 text on white | 3.61:1 | AA large text | Lc 63.6 | Content text, not long reading |
| #639431 text on black | 5.81:1 | AA | Lc -38.1 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F3F7F1
oklch(97.1% 0.009 134.9)
-
Step 100
100
#E5EDDF
oklch(93.6% 0.02 131.5)
-
Step 200
200
#D0DFC5
oklch(88.5% 0.039 131.9)
-
Step 300
300
#B1CA9D
oklch(80.9% 0.067 131.5)
-
Step 400
400
#87AF66
oklch(70.7% 0.109 132.1)
-
Step 500
500 (this color)
#639431
oklch(61.1% 0.14 131.9)
-
Step 600
600
#508406
oklch(55.5% 0.152 131.9)
-
Step 700
700
#426F00
oklch(49% 0.136 131.8)
-
Step 800
800
#365B02
oklch(42.7% 0.117 131.6)
-
Step 900
900
#2F4B10
oklch(37.7% 0.091 131.7)
-
Step 950
950
#1C2C0C
oklch(27% 0.057 131.6)
#639431 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) | #9A8924 | 0.077 |
| Deuteranopia (no green cones) | #938539 | 0.078 |
| Tritanopia (no blue cones) | #648E80 | 0.106 |
| Achromatopsia (no color) | #878787 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #639431
#639431
oklch(61.1% 0.14 131.9)
- #9F68C0
#9F68C0
oklch(61.1% 0.14 311.7)
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 #639431, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Drab #6B8E23 ΔE 0.018
- Dark Yellow Green #728F02 ΔE 0.025
- Mossy Green #638B27 ΔE 0.025
- Moss Green #658B38 ΔE 0.029
- Sap Green #5C8B15 ΔE 0.031
- Flat Green #699D4C ΔE 0.034
- Fern Green #548D44 ΔE 0.035
- Muted Green #5FA052 ΔE 0.039
Use #639431 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.