#638657
Closest named color: Dark Sage (#598556). oklch(58.1% 0.08 137.9), rgb(99, 134, 87).
Aa
Black text reads best on this color (5.07:1).
About this color
#638657 is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.080 and its hue 138°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Sage (#598556), ΔE 0.013 away. Black text reads best on it, at 5.07:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.080) |
| Temperature | in between |
| Nearest name | Dark Sage (#598556) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #638657 |
| RGB | rgb(99, 134, 87) |
| HSL | hsl(105, 21%, 43%) |
| OKLCH | oklch(58.1% 0.08 137.9) |
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 #638657 | 4.13:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #638657 | 5.07:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #638657 text on white | 4.13:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #638657 text on black | 5.07:1 | AA | Lc -33.3 | Non-text elements, placeholder text |
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
#F4F6F3
oklch(97.1% 0.004 134.8)
-
Step 100
100
#E6ECE5
oklch(93.7% 0.011 141.3)
-
Step 200
200
#D3DCD0
oklch(88.4% 0.019 137.8)
-
Step 300
300
#B6C7B0
oklch(81% 0.037 137.5)
-
Step 400
400
#8FAA87
oklch(70.8% 0.058 138.6)
-
Step 500
500
#749469
oklch(63.1% 0.072 137.8)
-
Step 600
600 (this color)
#638657
oklch(58.1% 0.08 137.9)
-
Step 700
700
#4B6B41
oklch(49.1% 0.075 138.5)
-
Step 800
800
#3E5735
oklch(42.7% 0.062 137.7)
-
Step 900
900
#35482F
oklch(37.8% 0.048 138.3)
-
Step 950
950
#1F2A1B
oklch(27% 0.031 137.5)
#638657 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) | #897F54 | 0.055 |
| Deuteranopia (no green cones) | #847B5A | 0.056 |
| Tritanopia (no blue cones) | #62837A | 0.055 |
| Achromatopsia (no color) | #7D7D7D | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638657
#638657
oklch(58.1% 0.08 137.9)
- #8E6B9A
#8E6B9A
oklch(58% 0.081 317.3)
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 #638657, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sage #598556 ΔE 0.013
- Slate Green #658D6D ΔE 0.032
- Swamp #698339 ΔE 0.033
- Military Green #667C3E ΔE 0.035
- Khaki Green #728639 ΔE 0.037
- Light Forest Green #4F9153 ΔE 0.040
- Fern Green #548D44 ΔE 0.041
- Drab #828344 ΔE 0.043
Use #638657 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.