#638A00
Closest named color: Sap Green (#5C8B15). oklch(58.2% 0.15 126.9), rgb(99, 138, 0).
Aa
Black text reads best on this color (5.16:1).
About this color
#638A00 is a medium-dark, vivid green. In OKLCH its lightness is 58%, its chroma 0.150 and its hue 127°. 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 5.16:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.150) |
| Temperature | in between |
| Nearest name | Sap Green (#5C8B15) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #638A00 |
| RGB | rgb(99, 138, 0) |
| HSL | hsl(77, 100%, 27%) |
| OKLCH | oklch(58.2% 0.15 126.9) |
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 #638A00 | 4.06:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #638A00 | 5.16:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #638A00 text on white | 4.06:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #638A00 text on black | 5.16:1 | AA | Lc -34.0 | 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 600.
-
Step 50
50
#F4F7F0
oklch(97.2% 0.01 125.7)
-
Step 100
100
#E6ECDF
oklch(93.5% 0.018 127.1)
-
Step 200
200
#D2DEC4
oklch(88.4% 0.037 127.4)
-
Step 300
300
#B5C99A
oklch(80.9% 0.067 126.6)
-
Step 400
400
#8FAD61
oklch(70.7% 0.108 126.6)
-
Step 500
500
#739830
oklch(63.1% 0.138 126.9)
-
Step 600
600 (this color)
#638A00
oklch(58.2% 0.15 126.9)
-
Step 700
700
#4D6D00
oklch(49.1% 0.127 127.1)
-
Step 800
800
#3F5900
oklch(42.7% 0.11 126.7)
-
Step 900
900
#354A0A
oklch(37.8% 0.09 126.8)
-
Step 950
950
#1F2B09
oklch(26.9% 0.056 126.5)
#638A00 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) | #928000 | 0.072 |
| Deuteranopia (no green cones) | #8D7D19 | 0.072 |
| Tritanopia (no blue cones) | #688375 | 0.121 |
| Achromatopsia (no color) | #7E7E7E | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638A00
#638A00
oklch(58.2% 0.15 126.9)
- #925FBF
#925FBF
oklch(58.1% 0.15 306.9)
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 #638A00, 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 0.016
- Olive Drab #6B8E23 ΔE 0.021
- Swamp Green #748500 ΔE 0.026
- Dark Yellow Green #728F02 ΔE 0.026
- Moss Green #658B38 ΔE 0.032
- Fern Green #548D44 ΔE 0.041
- Swamp #698339 ΔE 0.046
Use #638A00 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.