#647D21
Closest named color: Olive Green (#677A04). oklch(55.1% 0.12 123.7), rgb(100, 125, 33).
Aa
White text reads best on this color (4.66:1).
About this color
#647D21 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 55%, its chroma 0.120 and its hue 124°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Olive Green (#677A04), ΔE 0.013 away. White text reads best on it, at 4.66:1.
| Hue family | Yellows |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.120) |
| Temperature | in between |
| Nearest name | Olive Green (#677A04) |
| Black text | 4.49:1 |
| White text | 4.66:1 |
Values
| HEX | #647D21 |
| RGB | rgb(100, 125, 33) |
| HSL | hsl(76, 58%, 31%) |
| OKLCH | oklch(55.1% 0.12 123.7) |
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 #647D21 | 4.66:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #647D21 | 4.49:1 | AA large text | Lc 31.8 | Non-text elements, placeholder text |
| #647D21 text on white | 4.66:1 | AA | Lc 72.3 | Content text, not long reading |
| #647D21 text on black | 4.49:1 | AA large text | Lc -29.4 | 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
#F4F6F1
oklch(97% 0.007 124.4)
-
Step 100
100
#E8ECE1
oklch(93.7% 0.015 123)
-
Step 200
200
#D5DDC7
oklch(88.5% 0.031 123.3)
-
Step 300
300
#B9C7A1
oklch(80.9% 0.054 124)
-
Step 400
400
#96AA6D
oklch(70.7% 0.086 123.4)
-
Step 500
500
#7C9445
oklch(63% 0.109 123.5)
-
Step 600
600 (this color)
#647D21
oklch(55.1% 0.12 123.7)
-
Step 700
700
#546B14
oklch(49.2% 0.112 123.9)
-
Step 800
800
#455715
oklch(42.7% 0.092 123.6)
-
Step 900
900
#3A4819
oklch(37.8% 0.072 123.8)
-
Step 950
950
#222A10
oklch(27% 0.045 123.5)
#647D21 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) | #847511 | 0.049 |
| Deuteranopia (no green cones) | #817429 | 0.051 |
| Tritanopia (no blue cones) | #69776B | 0.098 |
| Achromatopsia (no color) | #747474 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647D21
#647D21
oklch(55.1% 0.12 123.7)
- #815EAB
#815EAB
oklch(55.1% 0.121 303.6)
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 #647D21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Green #677A04 ΔE 0.013
- Murky Green #6C7A0E ΔE 0.013
- Swamp #698339 ΔE 0.026
- Military Green #667C3E ΔE 0.029
- Muddy Green #657432 ΔE 0.034
- Swamp Green #748500 ΔE 0.037
- Khaki Green #728639 ΔE 0.038
- Mossy Green #638B27 ΔE 0.040
Use #647D21 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.