#637B57
Closest named color: Dark Sage (#598556). oklch(55.4% 0.061 135.4), rgb(99, 123, 87).
Aa
White text reads best on this color (4.66:1).
About this color
#637B57 is a medium-dark, muted green. In OKLCH its lightness is 55%, its chroma 0.061 and its hue 135°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Sage (#598556), ΔE 0.032 away. White text reads best on it, at 4.66:1.
| Hue family | Greens |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.061) |
| Temperature | in between |
| Nearest name | Dark Sage (#598556) |
| Black text | 4.50:1 |
| White text | 4.66:1 |
Values
| HEX | #637B57 |
| RGB | rgb(99, 123, 87) |
| HSL | hsl(100, 17%, 41%) |
| OKLCH | oklch(55.4% 0.061 135.4) |
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 #637B57 | 4.66:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #637B57 | 4.50:1 | AA | Lc 31.7 | Non-text elements, placeholder text |
| #637B57 text on white | 4.66:1 | AA | Lc 72.4 | Content text, not long reading |
| #637B57 text on black | 4.50:1 | AA | Lc -29.3 | 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
#F4F6F4
oklch(97.1% 0.003 145.5)
-
Step 100
100
#E7EBE6
oklch(93.6% 0.008 139.4)
-
Step 200
200
#D5DCD2
oklch(88.6% 0.015 136.1)
-
Step 300
300
#B9C5B3
oklch(80.9% 0.028 135)
-
Step 400
400
#95A78C
oklch(70.7% 0.043 135.1)
-
Step 500
500
#7B9270
oklch(63.2% 0.056 135.6)
-
Step 600
600 (this color)
#637B57
oklch(55.4% 0.061 135.4)
-
Step 700
700
#536848
oklch(49.1% 0.055 135.1)
-
Step 800
800
#44553B
oklch(42.7% 0.047 135)
-
Step 900
900
#394633
oklch(37.7% 0.036 135.9)
-
Step 950
950
#21291E
oklch(26.9% 0.023 137.2)
#637B57 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) | #7E7555 | 0.041 |
| Deuteranopia (no green cones) | #7A7359 | 0.040 |
| Tritanopia (no blue cones) | #637871 | 0.043 |
| Achromatopsia (no color) | #747474 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637B57
#637B57
oklch(55.4% 0.061 135.4)
- #80688B
#80688B
oklch(55.3% 0.06 315.1)
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 #637B57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sage #598556 ΔE 0.032
- Military Green #667C3E ΔE 0.033
- Muddy Green #657432 ΔE 0.044
- Grey Brown #7F7053 ΔE 0.049
- Swamp #698339 ΔE 0.050
- Dark Moss Green #606C38 ΔE 0.051
- Slate Green #658D6D ΔE 0.054
- Drab #828344 ΔE 0.058
Use #637B57 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.