#637337
Closest named color: Muddy Green (#657432). oklch(52.8% 0.087 121.7), rgb(99, 115, 55).
Aa
White text reads best on this color (5.20:1).
About this color
#637337 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 53%, its chroma 0.087 and its hue 122°. 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 5.20:1.
| Hue family | Yellows |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.087) |
| Temperature | in between |
| Nearest name | Muddy Green (#657432) |
| Black text | 4.03:1 |
| White text | 5.20:1 |
Values
| HEX | #637337 |
| RGB | rgb(99, 115, 55) |
| HSL | hsl(76, 35%, 33%) |
| OKLCH | oklch(52.8% 0.087 121.7) |
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 #637337 | 5.20:1 | AA | Lc -81.1 | Fine for body text |
| Black text on #637337 | 4.03:1 | AA large text | Lc 28.3 | Dividers and decoration only |
| #637337 text on white | 5.20:1 | AA | Lc 75.7 | Fine for body text |
| #637337 text on black | 4.03:1 | AA large text | Lc -26.0 | 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
#E8EBE3
oklch(93.6% 0.011 123.5)
-
Step 200
200
#D6DCCC
oklch(88.5% 0.022 123.7)
-
Step 300
300
#BCC5A9
oklch(80.9% 0.04 121.8)
-
Step 400
400
#9AA77C
oklch(70.7% 0.062 121.6)
-
Step 500
500
#81915A
oklch(63% 0.079 121.9)
-
Step 600
600 (this color)
#637337
oklch(52.8% 0.087 121.7)
-
Step 700
700
#596831
oklch(49.1% 0.081 122)
-
Step 800
800
#495529
oklch(42.8% 0.068 121.9)
-
Step 900
900
#3D4626
oklch(37.7% 0.052 121.7)
-
Step 950
950
#242917
oklch(27% 0.032 121.2)
#637337 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) | #796D32 | 0.035 |
| Deuteranopia (no green cones) | #776D3A | 0.035 |
| Tritanopia (no blue cones) | #676E65 | 0.071 |
| Achromatopsia (no color) | #6D6D6D | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637337
#637337
oklch(52.8% 0.087 121.7)
- #745F95
#745F95
oklch(52.8% 0.086 301.4)
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 #637337, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muddy Green #657432 ΔE 0.007
- Dark Moss Green #606C38 ΔE 0.022
- Military Green #667C3E ΔE 0.027
- Brown Green #706C11 ΔE 0.032
- Dark Olive Green #556B2F ΔE 0.033
- Browny Green #6F6C0A ΔE 0.034
- Murky Green #6C7A0E ΔE 0.042
- Olive Green #677A04 ΔE 0.045
Use #637337 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.