#639737
Closest named color: Olive Drab (#6B8E23). oklch(61.9% 0.139 133.1), rgb(99, 151, 55).
Aa
Black text reads best on this color (6.01:1).
About this color
#639737 is a medium-dark, moderately saturated green. In OKLCH its lightness is 62%, its chroma 0.139 and its hue 133°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Olive Drab (#6B8E23), ΔE 0.026 away. Black text reads best on it, at 6.01:1.
| Hue family | Greens |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.139) |
| Temperature | in between |
| Nearest name | Olive Drab (#6B8E23) |
| Black text | 6.01:1 |
| White text | 3.49:1 |
Values
| HEX | #639737 |
| RGB | rgb(99, 151, 55) |
| HSL | hsl(93, 47%, 40%) |
| OKLCH | oklch(61.9% 0.139 133.1) |
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 #639737 | 3.49:1 | AA large text | Lc -67.8 | Content text, not long reading |
| Black text on #639737 | 6.01:1 | AA | Lc 41.7 | Non-text elements, placeholder text |
| #639737 text on white | 3.49:1 | AA large text | Lc 62.3 | Content text, not long reading |
| #639737 text on black | 6.01:1 | AA | Lc -39.4 | 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
#E5EDE0
oklch(93.6% 0.019 133.1)
-
Step 200
200
#CFDFC6
oklch(88.5% 0.038 134.1)
-
Step 300
300
#B0CB9E
oklch(81% 0.068 133)
-
Step 400
400
#85AF67
oklch(70.6% 0.109 133.2)
-
Step 500
500 (this color)
#639737
oklch(61.9% 0.139 133.1)
-
Step 600
600
#4D850F
oklch(55.6% 0.152 133.2)
-
Step 700
700
#3F7000
oklch(49.1% 0.138 133)
-
Step 800
800
#345C07
oklch(42.9% 0.117 133.1)
-
Step 900
900
#2D4B12
oklch(37.6% 0.091 133.2)
-
Step 950
950
#1B2C0D
oklch(27% 0.056 133)
#639737 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) | #9D8C2C | 0.080 |
| Deuteranopia (no green cones) | #96883E | 0.081 |
| Tritanopia (no blue cones) | #639183 | 0.104 |
| Achromatopsia (no color) | #898989 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #639737
#639737
oklch(61.9% 0.139 133.1)
- #A36AC1
#A36AC1
oklch(61.9% 0.14 313.1)
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 #639737, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Drab #6B8E23 ΔE 0.026
- Flat Green #699D4C ΔE 0.026
- Dark Yellow Green #728F02 ΔE 0.030
- Muted Green #5FA052 ΔE 0.031
- Mossy Green #638B27 ΔE 0.034
- Moss Green #658B38 ΔE 0.035
- Drab Green #749551 ΔE 0.039
- Sap Green #5C8B15 ΔE 0.040
Use #639737 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.