#3FA311
Closest named color: Grassy Green (#419C03). oklch(63.1% 0.193 138.9), rgb(63, 163, 17).
Aa
Black text reads best on this color (6.45:1).
About this color
#3FA311 is a medium-light, vivid green. In OKLCH its lightness is 63%, its chroma 0.193 and its hue 139°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grassy Green (#419C03), ΔE 0.020 away. Black text reads best on it, at 6.45:1.
| Hue family | Greens |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.193) |
| Temperature | in between |
| Nearest name | Grassy Green (#419C03) |
| Black text | 6.45:1 |
| White text | 3.25:1 |
Values
| HEX | #3FA311 |
| RGB | rgb(63, 163, 17) |
| HSL | hsl(101, 81%, 35%) |
| OKLCH | oklch(63.1% 0.193 138.9) |
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 #3FA311 | 3.25:1 | AA large text | Lc -64.8 | Content text, not long reading |
| Black text on #3FA311 | 6.45:1 | AA | Lc 44.7 | Non-text elements, placeholder text |
| #3FA311 text on white | 3.25:1 | AA large text | Lc 59.4 | Large or bold text, headings |
| #3FA311 text on black | 6.45:1 | AA | Lc -42.4 | 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 500.
-
Step 50
50
#F1F8F0
oklch(97.2% 0.013 141.8)
-
Step 100
100
#E1EFDD
oklch(93.7% 0.028 138.7)
-
Step 200
200
#C8E2C1
oklch(88.5% 0.052 139.1)
-
Step 300
300
#A2D095
oklch(81% 0.094 138.9)
-
Step 400
400
#6CB656
oklch(70.6% 0.15 138.9)
-
Step 500
500 (this color)
#3FA311
oklch(63.1% 0.193 138.9)
-
Step 600
600
#308A00
oklch(55.7% 0.176 139)
-
Step 700
700
#277400
oklch(49.2% 0.155 139)
-
Step 800
800
#1F5F00
oklch(42.7% 0.134 138.9)
-
Step 900
900
#184F00
oklch(37.6% 0.119 139)
-
Step 950
950
#0E2F03
oklch(27% 0.08 138.9)
#3FA311 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) | #A89400 | 0.127 |
| Deuteranopia (no green cones) | #9C8C27 | 0.125 |
| Tritanopia (no blue cones) | #339D8A | 0.132 |
| Achromatopsia (no color) | #8F8F8F | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3FA311
#3FA311
oklch(63.1% 0.193 138.9)
- #B95BD2
#B95BD2
oklch(63.1% 0.192 318.8)
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 #3FA311, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grassy Green #419C03 ΔE 0.020
- Grass Green #3F9B0B ΔE 0.023
- Kelly Green #02AB2E ΔE 0.026
- Leaf Green #5CA904 ΔE 0.032
- Medium Green #39AD48 ΔE 0.040
- Grass #5CAC2D ΔE 0.041
- Mid Green #50A747 ΔE 0.042
- Shamrock #01B44C ΔE 0.052
Use #3FA311 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.