#638540
Closest named color: Swamp (#698339). oklch(57.4% 0.104 130.7), rgb(99, 133, 64).
Aa
Black text reads best on this color (4.95:1).
About this color
#638540 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.104 and its hue 131°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Swamp (#698339), ΔE 0.009 away. Black text reads best on it, at 4.95:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.104) |
| Temperature | in between |
| Nearest name | Swamp (#698339) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #638540 |
| RGB | rgb(99, 133, 64) |
| HSL | hsl(90, 35%, 39%) |
| OKLCH | oklch(57.4% 0.104 130.7) |
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 #638540 | 4.23:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #638540 | 4.95:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #638540 text on white | 4.23:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #638540 text on black | 4.95:1 | AA | Lc -32.5 | 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 600.
-
Step 50
50
#F4F6F2
oklch(97.1% 0.006 128.5)
-
Step 100
100
#E7ECE2
oklch(93.7% 0.014 128.6)
-
Step 200
200
#D3DDCB
oklch(88.5% 0.027 130.9)
-
Step 300
300
#B6C7A8
oklch(80.8% 0.046 130.9)
-
Step 400
400
#90AB79
oklch(70.8% 0.076 131.2)
-
Step 500
500
#759556
oklch(63% 0.096 130.7)
-
Step 600
600 (this color)
#638540
oklch(57.4% 0.104 130.7)
-
Step 700
700
#4D6C2D
oklch(49.2% 0.097 131)
-
Step 800
800
#3F5826
oklch(42.7% 0.081 131.1)
-
Step 900
900
#364824
oklch(37.6% 0.062 130.6)
-
Step 950
950
#202A15
oklch(26.9% 0.039 129.5)
#638540 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) | #8A7D3A | 0.057 |
| Deuteranopia (no green cones) | #857A44 | 0.058 |
| Tritanopia (no blue cones) | #658075 | 0.079 |
| Achromatopsia (no color) | #7B7B7B | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638540
#638540
oklch(57.4% 0.104 130.7)
- #8C66A6
#8C66A6
oklch(57.4% 0.104 310.7)
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 #638540, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Swamp #698339 ΔE 0.009
- Khaki Green #728639 ΔE 0.020
- Moss Green #658B38 ΔE 0.022
- Military Green #667C3E ΔE 0.026
- Fern Green #548D44 ΔE 0.026
- Dark Sage #598556 ΔE 0.028
- Mossy Green #638B27 ΔE 0.033
- Light Forest Green #4F9153 ΔE 0.037
Use #638540 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.