#639B4A
Closest named color: Flat Green (#699D4C). oklch(63.1% 0.128 136.9), rgb(99, 155, 74).
Aa
Black text reads best on this color (6.31:1).
About this color
#639B4A is a medium-light, moderately saturated green. In OKLCH its lightness is 63%, its chroma 0.128 and its hue 137°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Flat Green (#699D4C), ΔE 0.010 away. Black text reads best on it, at 6.31:1.
| Hue family | Greens |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.128) |
| Temperature | in between |
| Nearest name | Flat Green (#699D4C) |
| Black text | 6.31:1 |
| White text | 3.32:1 |
Values
| HEX | #639B4A |
| RGB | rgb(99, 155, 74) |
| HSL | hsl(101, 35%, 45%) |
| OKLCH | oklch(63.1% 0.128 136.9) |
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 #639B4A | 3.32:1 | AA large text | Lc -65.9 | Content text, not long reading |
| Black text on #639B4A | 6.31:1 | AA | Lc 43.6 | Non-text elements, placeholder text |
| #639B4A text on white | 3.32:1 | AA large text | Lc 60.5 | Content text, not long reading |
| #639B4A text on black | 6.31:1 | AA | Lc -41.2 | 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
#E4EDE1
oklch(93.6% 0.019 137.8)
-
Step 200
200
#CFDFC9
oklch(88.6% 0.034 137.1)
-
Step 300
300
#AECBA3
oklch(81% 0.063 137.1)
-
Step 400
400
#83AF71
oklch(70.7% 0.099 136.9)
-
Step 500
500 (this color)
#639B4A
oklch(63.1% 0.128 136.9)
-
Step 600
600
#49852A
oklch(55.6% 0.139 136.8)
-
Step 700
700
#3A701D
oklch(49% 0.128 136.8)
-
Step 800
800
#305C1A
oklch(42.8% 0.108 137)
-
Step 900
900
#2B4B1C
oklch(37.6% 0.083 136.8)
-
Step 950
950
#1A2C11
oklch(26.9% 0.052 136.1)
#639B4A 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) | #A09043 | 0.083 |
| Deuteranopia (no green cones) | #988B4F | 0.083 |
| Tritanopia (no blue cones) | #619688 | 0.089 |
| Achromatopsia (no color) | #8D8D8D | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #639B4A
#639B4A
oklch(63.1% 0.128 136.9)
- #A86FBC
#A86FBC
oklch(63% 0.128 316.9)
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 #639B4A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Green #699D4C ΔE 0.010
- Muted Green #5FA052 ΔE 0.014
- Off Green #6BA353 ΔE 0.026
- Drab Green #749551 ΔE 0.029
- Moss #769958 ΔE 0.031
- Mid Green #50A747 ΔE 0.039
- Fern #63A950 ΔE 0.040
- Light Forest Green #4F9153 ΔE 0.041
Use #639B4A 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.