#31B437
Closest named color: Shamrock (#01B44C). oklch(67.6% 0.198 143.5), rgb(49, 180, 55).
Aa
Black text reads best on this color (7.71:1).
About this color
#31B437 is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.198 and its hue 144°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.019 away. Black text reads best on it, at 7.71:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.198) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 7.71:1 |
| White text | 2.72:1 |
Values
| HEX | #31B437 |
| RGB | rgb(49, 180, 55) |
| HSL | hsl(123, 57%, 45%) |
| OKLCH | oklch(67.6% 0.198 143.5) |
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 #31B437 | 2.72:1 | Fails | Lc -57.4 | Large or bold text, headings |
| Black text on #31B437 | 7.71:1 | AAA | Lc 51.8 | Large or bold text, headings |
| #31B437 text on white | 2.72:1 | Fails | Lc 52.2 | Large or bold text, headings |
| #31B437 text on black | 7.71:1 | AAA | Lc -49.7 | Large or bold text, headings |
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 400.
-
Step 50
50
#EFF9EF
oklch(97.2% 0.017 145.4)
-
Step 100
100
#DCF1DB
oklch(93.7% 0.037 144)
-
Step 200
200
#BFE6BC
oklch(88.6% 0.07 143.1)
-
Step 300
300
#8ED58C
oklch(80.8% 0.124 143.7)
-
Step 400
400 (this color)
#31B437
oklch(67.6% 0.198 143.5)
-
Step 500
500
#00A71B
oklch(63.2% 0.208 143.5)
-
Step 600
600
#008C15
oklch(55.5% 0.183 143.5)
-
Step 700
700
#007610
oklch(49.1% 0.161 143.5)
-
Step 800
800
#00610B
oklch(42.7% 0.141 143.5)
-
Step 900
900
#005108
oklch(37.7% 0.124 143.6)
-
Step 950
950
#003103
oklch(27.2% 0.089 143.6)
#31B437 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) | #B8A325 | 0.144 |
| Deuteranopia (no green cones) | #A99943 | 0.143 |
| Tritanopia (no blue cones) | #00AF9B | 0.125 |
| Achromatopsia (no color) | #9D9D9D | 0.200 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31B437
#31B437
oklch(67.6% 0.198 143.5)
- #CF64DB
#CF64DB
oklch(67.5% 0.198 323.5)
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 #31B437, closest first.
No curated palette has a color within ΔE 0.04 of #31B437.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.019
- Leafy Green #51B73B ΔE 0.024
- Medium Green #39AD48 ΔE 0.029
- Kelly Green #02AB2E ΔE 0.032
- Grass #5CAC2D ΔE 0.032
- Shamrock Green #02C14D ΔE 0.036
- Leaf Green #5CA904 ΔE 0.037
- Frog Green #58BC08 ΔE 0.041
Use #31B437 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.