#637631
Closest named color: Muddy Green (#657432). oklch(53.5% 0.097 122.6), rgb(99, 118, 49).
Aa
White text reads best on this color (5.04:1).
About this color
#637631 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 53%, its chroma 0.097 and its hue 123°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Muddy Green (#657432), ΔE 0.007 away. White text reads best on it, at 5.04:1.
| Hue family | Yellows |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.097) |
| Temperature | in between |
| Nearest name | Muddy Green (#657432) |
| Black text | 4.16:1 |
| White text | 5.04:1 |
Values
| HEX | #637631 |
| RGB | rgb(99, 118, 49) |
| HSL | hsl(77, 41%, 33%) |
| OKLCH | oklch(53.5% 0.097 122.6) |
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 #637631 | 5.04:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #637631 | 4.16:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #637631 text on white | 5.04:1 | AA | Lc 74.8 | Content text, not long reading |
| #637631 text on black | 4.16:1 | AA large text | Lc -27.0 | Dividers and decoration only |
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
#F5F6F2
oklch(97.1% 0.005 117.9)
-
Step 100
100
#E8EBE2
oklch(93.5% 0.012 121.7)
-
Step 200
200
#D6DCCB
oklch(88.5% 0.024 122.8)
-
Step 300
300
#BBC6A7
oklch(81% 0.044 123.3)
-
Step 400
400
#98A877
oklch(70.6% 0.07 122.9)
-
Step 500
500
#809254
oklch(63.1% 0.088 122.2)
-
Step 600
600 (this color)
#637631
oklch(53.5% 0.097 122.6)
-
Step 700
700
#57692A
oklch(49.1% 0.091 123.1)
-
Step 800
800
#485524
oklch(42.6% 0.074 121.9)
-
Step 900
900
#3C4722
oklch(37.8% 0.059 122.8)
-
Step 950
950
#232915
oklch(26.9% 0.036 122.4)
#637631 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) | #7D6F2A | 0.041 |
| Deuteranopia (no green cones) | #7A6F35 | 0.041 |
| Tritanopia (no blue cones) | #687067 | 0.082 |
| Achromatopsia (no color) | #6F6F6F | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637631
#637631
oklch(53.5% 0.097 122.6)
- #785F9C
#785F9C
oklch(53.6% 0.097 302.1)
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 #637631, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muddy Green #657432 ΔE 0.007
- Military Green #667C3E ΔE 0.021
- Murky Green #6C7A0E ΔE 0.031
- Olive Green #677A04 ΔE 0.033
- Brown Green #706C11 ΔE 0.033
- Browny Green #6F6C0A ΔE 0.033
- Dark Moss Green #606C38 ΔE 0.034
- Swamp #698339 ΔE 0.039
Use #637631 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.