#31B550
Closest named color: Shamrock (#01B44C). oklch(68.1% 0.181 147.2), rgb(49, 181, 80).
Aa
Black text reads best on this color (7.85:1).
About this color
#31B550 is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.181 and its hue 147°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.015 away. Black text reads best on it, at 7.85:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.181) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 7.85:1 |
| White text | 2.67:1 |
Values
| HEX | #31B550 |
| RGB | rgb(49, 181, 80) |
| HSL | hsl(134, 57%, 45%) |
| OKLCH | oklch(68.1% 0.181 147.2) |
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 #31B550 | 2.67:1 | Fails | Lc -56.6 | Large or bold text, headings |
| Black text on #31B550 | 7.85:1 | AAA | Lc 52.5 | Large or bold text, headings |
| #31B550 text on white | 2.67:1 | Fails | Lc 51.5 | Large or bold text, headings |
| #31B550 text on black | 7.85:1 | AAA | Lc -50.4 | 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
#EFF8F0
oklch(97% 0.014 148.8)
-
Step 100
100
#DCF0DE
oklch(93.5% 0.032 148.2)
-
Step 200
200
#BFE5C2
oklch(88.5% 0.062 147.2)
-
Step 300
300
#8ED596
oklch(81% 0.113 147.2)
-
Step 400
400 (this color)
#31B550
oklch(68.1% 0.181 147.2)
-
Step 500
500
#00A63D
oklch(63.2% 0.187 147.2)
-
Step 600
600
#008B32
oklch(55.5% 0.164 147.3)
-
Step 700
700
#007529
oklch(49% 0.144 147.3)
-
Step 800
800
#006020
oklch(42.6% 0.126 147.3)
-
Step 900
900
#005019
oklch(37.6% 0.111 147.2)
-
Step 950
950
#00300C
oklch(26.9% 0.079 147.3)
#31B550 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) | #B7A546 | 0.141 |
| Deuteranopia (no green cones) | #A89A58 | 0.140 |
| Tritanopia (no blue cones) | #00B19E | 0.106 |
| Achromatopsia (no color) | #9E9E9E | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31B550
#31B550
oklch(68.1% 0.181 147.2)
- #D16AD1
#D16AD1
oklch(68.1% 0.181 327.3)
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 #31B550, closest first.
No curated palette has a color within ΔE 0.04 of #31B550.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.015
- Medium Green #39AD48 ΔE 0.022
- Cool Green #33B864 ΔE 0.022
- Leafy Green #51B73B ΔE 0.026
- Dark Pastel Green #56AE57 ΔE 0.033
- Grass #5CAC2D ΔE 0.036
- Shamrock Green #02C14D ΔE 0.036
- Jade Green #2BAF6A ΔE 0.039
Use #31B550 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.