#31B758
Closest named color: Cool Green (#33B864). oklch(68.7% 0.176 148.6), rgb(49, 183, 88).
Aa
Black text reads best on this color (8.04:1).
About this color
#31B758 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.176 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Cool Green (#33B864), ΔE 0.014 away. Black text reads best on it, at 8.04:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.176) |
| Temperature | in between |
| Nearest name | Cool Green (#33B864) |
| Black text | 8.04:1 |
| White text | 2.61:1 |
Values
| HEX | #31B758 |
| RGB | rgb(49, 183, 88) |
| HSL | hsl(137, 58%, 45%) |
| OKLCH | oklch(68.7% 0.176 148.6) |
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 #31B758 | 2.61:1 | Fails | Lc -55.6 | Large or bold text, headings |
| Black text on #31B758 | 8.04:1 | AAA | Lc 53.5 | Large or bold text, headings |
| #31B758 text on white | 2.61:1 | Fails | Lc 50.5 | Large or bold text, headings |
| #31B758 text on black | 8.04:1 | AAA | Lc -51.5 | 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
#BEE5C3
oklch(88.5% 0.062 148.6)
-
Step 300
300
#8DD599
oklch(81% 0.111 148.7)
-
Step 400
400 (this color)
#31B758
oklch(68.7% 0.176 148.6)
-
Step 500
500
#00A545
oklch(63% 0.179 148.7)
-
Step 600
600
#008B39
oklch(55.6% 0.158 148.7)
-
Step 700
700
#00752F
oklch(49.1% 0.139 148.8)
-
Step 800
800
#006025
oklch(42.7% 0.121 148.7)
-
Step 900
900
#00501D
oklch(37.6% 0.108 148.5)
-
Step 950
950
#00300F
oklch(27% 0.076 148.8)
#31B758 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) | #B9A750 | 0.142 |
| Deuteranopia (no green cones) | #A99C5F | 0.140 |
| Tritanopia (no blue cones) | #00B3A1 | 0.101 |
| Achromatopsia (no color) | #A0A0A0 | 0.177 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31B758
#31B758
oklch(68.7% 0.176 148.6)
- #D46DD0
#D46DD0
oklch(68.8% 0.177 328.7)
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 #31B758, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Green #33B864 ΔE 0.014
- Shamrock #01B44C ΔE 0.021
- Medium Green #39AD48 ΔE 0.029
- Leafy Green #51B73B ΔE 0.029
- Dark Pastel Green #56AE57 ΔE 0.032
- Dark Mint Green #20C073 ΔE 0.034
- Shamrock Green #02C14D ΔE 0.035
- Algae Green #21C36F ΔE 0.036
Use #31B758 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.