#637B2F
Closest named color: Military Green (#667C3E). oklch(54.7% 0.106 124.6), rgb(99, 123, 47).
Aa
White text reads best on this color (4.76:1).
About this color
#637B2F is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 55%, its chroma 0.106 and its hue 125°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Military Green (#667C3E), ΔE 0.017 away. White text reads best on it, at 4.76:1.
| Hue family | Yellows |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.106) |
| Temperature | in between |
| Nearest name | Military Green (#667C3E) |
| Black text | 4.40:1 |
| White text | 4.76:1 |
Values
| HEX | #637B2F |
| RGB | rgb(99, 123, 47) |
| HSL | hsl(79, 45%, 33%) |
| OKLCH | oklch(54.7% 0.106 124.6) |
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 #637B2F | 4.76:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #637B2F | 4.40:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #637B2F text on white | 4.76:1 | AA | Lc 73.0 | Content text, not long reading |
| #637B2F text on black | 4.40:1 | AA large text | Lc -28.7 | 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
#F4F6F2
oklch(97.1% 0.006 128.5)
-
Step 100
100
#E8ECE2
oklch(93.7% 0.014 124.6)
-
Step 200
200
#D5DCCA
oklch(88.4% 0.025 124.3)
-
Step 300
300
#BAC6A5
oklch(80.8% 0.047 123.7)
-
Step 400
400
#96A974
oklch(70.7% 0.076 124.3)
-
Step 500
500
#7C944F
oklch(63.1% 0.099 124.9)
-
Step 600
600 (this color)
#637B2F
oklch(54.7% 0.106 124.6)
-
Step 700
700
#546A24
oklch(49.1% 0.099 124.8)
-
Step 800
800
#455620
oklch(42.6% 0.081 124.4)
-
Step 900
900
#3A471F
oklch(37.6% 0.064 124.3)
-
Step 950
950
#222A13
oklch(27% 0.041 124.8)
#637B2F 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) | #827327 | 0.048 |
| Deuteranopia (no green cones) | #7E7234 | 0.048 |
| Tritanopia (no blue cones) | #67756B | 0.087 |
| Achromatopsia (no color) | #737373 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637B2F
#637B2F
oklch(54.7% 0.106 124.6)
- #7F60A3
#7F60A3
oklch(54.8% 0.106 304.4)
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 #637B2F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Military Green #667C3E ΔE 0.017
- Murky Green #6C7A0E ΔE 0.022
- Muddy Green #657432 ΔE 0.022
- Olive Green #677A04 ΔE 0.024
- Swamp #698339 ΔE 0.026
- Khaki Green #728639 ΔE 0.040
- Brown Green #706C11 ΔE 0.043
- Browny Green #6F6C0A ΔE 0.043
Use #637B2F 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.