#638F1D
Closest named color: Olive Drab (#6B8E23). oklch(59.6% 0.146 129.1), rgb(99, 143, 29).
Aa
Black text reads best on this color (5.47:1).
About this color
#638F1D is a medium-dark, vivid green. In OKLCH its lightness is 60%, its chroma 0.146 and its hue 129°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Olive Drab (#6B8E23), ΔE 0.012 away. Black text reads best on it, at 5.47:1.
| Hue family | Greens |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.146) |
| Temperature | in between |
| Nearest name | Olive Drab (#6B8E23) |
| Black text | 5.47:1 |
| White text | 3.83:1 |
Values
| HEX | #638F1D |
| RGB | rgb(99, 143, 29) |
| HSL | hsl(83, 66%, 34%) |
| OKLCH | oklch(59.6% 0.146 129.1) |
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 #638F1D | 3.83:1 | AA large text | Lc -71.1 | Content text, not long reading |
| Black text on #638F1D | 5.47:1 | AA | Lc 38.4 | Non-text elements, placeholder text |
| #638F1D text on white | 3.83:1 | AA large text | Lc 65.6 | Content text, not long reading |
| #638F1D text on black | 5.47:1 | AA | Lc -36.0 | 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
#F3F7F0
oklch(97.1% 0.01 131.4)
-
Step 100
100
#E5EDDE
oklch(93.6% 0.022 130)
-
Step 200
200
#D1DFC3
oklch(88.6% 0.041 129)
-
Step 300
300
#B2CA99
oklch(80.8% 0.072 129.1)
-
Step 400
400
#8AAF5F
oklch(70.8% 0.115 129.3)
-
Step 500
500 (this color)
#638F1D
oklch(59.6% 0.146 129.1)
-
Step 600
600
#578300
oklch(55.6% 0.148 129.3)
-
Step 700
700
#496E00
oklch(49.1% 0.13 129)
-
Step 800
800
#3B5A00
oklch(42.7% 0.113 129)
-
Step 900
900
#314B06
oklch(37.8% 0.096 129.3)
-
Step 950
950
#1D2C08
oklch(27% 0.06 129.2)
#638F1D 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) | #968400 | 0.073 |
| Deuteranopia (no green cones) | #908129 | 0.075 |
| Tritanopia (no blue cones) | #66887A | 0.115 |
| Achromatopsia (no color) | #828282 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638F1D
#638F1D
oklch(59.6% 0.146 129.1)
- #9963C0
#9963C0
oklch(59.6% 0.147 309.4)
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 #638F1D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Drab #6B8E23 ΔE 0.012
- Mossy Green #638B27 ΔE 0.015
- Sap Green #5C8B15 ΔE 0.016
- Dark Yellow Green #728F02 ΔE 0.019
- Moss Green #658B38 ΔE 0.027
- Swamp Green #748500 ΔE 0.032
- Fern Green #548D44 ΔE 0.036
- Khaki Green #728639 ΔE 0.044
Use #638F1D 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.