#637E4E
Closest named color: Military Green (#667C3E). oklch(55.9% 0.077 132.3), rgb(99, 126, 78).
Aa
Black text reads best on this color (4.62:1).
About this color
#637E4E is a medium-dark, moderately saturated green. In OKLCH its lightness is 56%, its chroma 0.077 and its hue 132°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Military Green (#667C3E), ΔE 0.018 away. Black text reads best on it, at 4.62:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.077) |
| Temperature | in between |
| Nearest name | Military Green (#667C3E) |
| Black text | 4.62:1 |
| White text | 4.54:1 |
Values
| HEX | #637E4E |
| RGB | rgb(99, 126, 78) |
| HSL | hsl(94, 24%, 40%) |
| OKLCH | oklch(55.9% 0.077 132.3) |
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 #637E4E | 4.54:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #637E4E | 4.62:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #637E4E text on white | 4.54:1 | AA | Lc 71.5 | Content text, not long reading |
| #637E4E text on black | 4.62:1 | AA | Lc -30.2 | 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 600.
-
Step 50
50
#F4F6F3
oklch(97.1% 0.004 134.8)
-
Step 100
100
#E7EBE5
oklch(93.5% 0.009 134.9)
-
Step 200
200
#D4DCCF
oklch(88.5% 0.02 133.1)
-
Step 300
300
#B8C6AF
oklch(80.9% 0.035 133)
-
Step 400
400
#94A885
oklch(70.6% 0.054 132)
-
Step 500
500
#799366
oklch(63.1% 0.071 132.5)
-
Step 600
600 (this color)
#637E4E
oklch(55.9% 0.077 132.3)
-
Step 700
700
#51693E
oklch(49% 0.071 132.3)
-
Step 800
800
#435633
oklch(42.7% 0.06 131.7)
-
Step 900
900
#38472D
oklch(37.7% 0.047 132.6)
-
Step 950
950
#212A1B
oklch(27.1% 0.03 133.3)
#637E4E 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) | #82774B | 0.047 |
| Deuteranopia (no green cones) | #7E7551 | 0.047 |
| Tritanopia (no blue cones) | #647A72 | 0.058 |
| Achromatopsia (no color) | #767676 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637E4E
#637E4E
oklch(55.9% 0.077 132.3)
- #846795
#846795
oklch(56% 0.077 312.6)
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 #637E4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Military Green #667C3E ΔE 0.018
- Dark Sage #598556 ΔE 0.021
- Swamp #698339 ΔE 0.033
- Muddy Green #657432 ΔE 0.036
- Khaki Green #728639 ΔE 0.043
- Drab #828344 ΔE 0.048
- Slate Green #658D6D ΔE 0.052
- Fern Green #548D44 ΔE 0.053
Use #637E4E 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.