#638C11
Closest named color: Sap Green (#5C8B15). oklch(58.8% 0.148 127.9), rgb(99, 140, 17).
Aa
Black text reads best on this color (5.28:1).
About this color
#638C11 is a medium-dark, vivid green. In OKLCH its lightness is 59%, its chroma 0.148 and its hue 128°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sap Green (#5C8B15), ΔE 0.009 away. Black text reads best on it, at 5.28:1.
| Hue family | Greens |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.148) |
| Temperature | in between |
| Nearest name | Sap Green (#5C8B15) |
| Black text | 5.28:1 |
| White text | 3.96:1 |
Values
| HEX | #638C11 |
| RGB | rgb(99, 140, 17) |
| HSL | hsl(80, 78%, 31%) |
| OKLCH | oklch(58.8% 0.148 127.9) |
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 #638C11 | 3.96:1 | AA large text | Lc -72.3 | Content text, not long reading |
| Black text on #638C11 | 5.28:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #638C11 text on white | 3.96:1 | AA large text | Lc 66.8 | Content text, not long reading |
| #638C11 text on black | 5.28:1 | AA | Lc -34.8 | 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
#F4F7F0
oklch(97.2% 0.01 125.7)
-
Step 100
100
#E6EDDF
oklch(93.7% 0.02 128.7)
-
Step 200
200
#D2DEC4
oklch(88.4% 0.037 127.4)
-
Step 300
300
#B4C99B
oklch(80.8% 0.067 127.8)
-
Step 400
400
#8DAD63
oklch(70.6% 0.106 128)
-
Step 500
500
#729834
oklch(63.1% 0.135 127.6)
-
Step 600
600 (this color)
#638C11
oklch(58.8% 0.148 127.9)
-
Step 700
700
#4B6D00
oklch(49% 0.128 127.9)
-
Step 800
800
#3D5A00
oklch(42.8% 0.112 128.1)
-
Step 900
900
#344A0D
oklch(37.7% 0.089 127.8)
-
Step 950
950
#1E2B0A
oklch(26.8% 0.056 128)
#638C11 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) | #938100 | 0.072 |
| Deuteranopia (no green cones) | #8E7F21 | 0.072 |
| Tritanopia (no blue cones) | #678577 | 0.118 |
| Achromatopsia (no color) | #808080 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638C11
#638C11
oklch(58.8% 0.148 127.9)
- #9561BF
#9561BF
oklch(58.8% 0.147 308)
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 #638C11, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sap Green #5C8B15 ΔE 0.009
- Mossy Green #638B27 ΔE 0.013
- Olive Drab #6B8E23 ΔE 0.016
- Dark Yellow Green #728F02 ΔE 0.022
- Swamp Green #748500 ΔE 0.027
- Moss Green #658B38 ΔE 0.028
- Fern Green #548D44 ΔE 0.038
- Khaki Green #728639 ΔE 0.044
Use #638C11 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.