#637559
Closest named color: Grey Brown (#7F7053). oklch(54% 0.048 134.5), rgb(99, 117, 89).
Aa
White text reads best on this color (4.97:1).
About this color
#637559 is a medium-dark, muted green. In OKLCH its lightness is 54%, its chroma 0.048 and its hue 135°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grey Brown (#7F7053), ΔE 0.042 away. White text reads best on it, at 4.97:1.
| Hue family | Greens |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.048) |
| Temperature | in between |
| Nearest name | Grey Brown (#7F7053) |
| Black text | 4.21:1 |
| White text | 4.97:1 |
Values
| HEX | #637559 |
| RGB | rgb(99, 117, 89) |
| HSL | hsl(99, 14%, 40%) |
| OKLCH | oklch(54% 0.048 134.5) |
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 #637559 | 4.97:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #637559 | 4.21:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #637559 text on white | 4.97:1 | AA | Lc 74.4 | Content text, not long reading |
| #637559 text on black | 4.21:1 | AA large text | Lc -27.3 | 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
#F5F6F4
oklch(97.2% 0.003 128.5)
-
Step 100
100
#E8EBE7
oklch(93.7% 0.006 137.8)
-
Step 200
200
#D6DBD3
oklch(88.5% 0.012 133.4)
-
Step 300
300
#BBC4B6
oklch(80.9% 0.022 134.1)
-
Step 400
400
#98A690
oklch(70.8% 0.035 134)
-
Step 500
500
#7E9075
oklch(63.1% 0.045 135.2)
-
Step 600
600 (this color)
#637559
oklch(54% 0.048 134.5)
-
Step 700
700
#56674D
oklch(49.2% 0.045 134.9)
-
Step 800
800
#47543F
oklch(42.8% 0.037 133.7)
-
Step 900
900
#3B4536
oklch(37.7% 0.028 135.2)
-
Step 950
950
#232820
oklch(26.9% 0.016 133.7)
#637559 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) | #777157 | 0.030 |
| Deuteranopia (no green cones) | #746F5A | 0.030 |
| Tritanopia (no blue cones) | #63736D | 0.033 |
| Achromatopsia (no color) | #707070 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637559
#637559
oklch(54% 0.048 134.5)
- #796782
#796782
oklch(54.1% 0.047 314.4)
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 #637559, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Brown #7F7053 ΔE 0.042
- Dark Moss Green #606C38 ΔE 0.045
- Military Green #667C3E ΔE 0.047
- Muddy Green #657432 ΔE 0.049
- Dark Sage #598556 ΔE 0.051
- Dim Gray #696969 ΔE 0.051
- Dark Taupe #7F684E ΔE 0.052
- Dull Brown #876E4B ΔE 0.055
Use #637559 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.