#31D78A
Closest named color: Seaweed (#18D17B). oklch(77.9% 0.172 157.3), rgb(49, 215, 138).
Aa
Black text reads best on this color (11.21:1).
About this color
#31D78A is a medium-light, vivid green. In OKLCH its lightness is 78%, its chroma 0.172 and its hue 157°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.025 away. Black text reads best on it, at 11.21:1.
| Hue family | Greens |
| Lightness | medium-light (78%) |
| Chroma | vivid (0.172) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 11.21:1 |
| White text | 1.87:1 |
Values
| HEX | #31D78A |
| RGB | rgb(49, 215, 138) |
| HSL | hsl(152, 67%, 52%) |
| OKLCH | oklch(77.9% 0.172 157.3) |
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 #31D78A | 1.87:1 | Fails | Lc -39.1 | Non-text elements, placeholder text |
| Black text on #31D78A | 11.21:1 | AAA | Lc 69.0 | Content text, not long reading |
| #31D78A text on white | 1.87:1 | Fails | Lc 34.9 | Non-text elements, placeholder text |
| #31D78A text on black | 11.21:1 | AAA | Lc -67.6 | Content text, not long reading |
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 300.
-
Step 50
50
#EAFAEF
oklch(97% 0.022 155.9)
-
Step 100
100
#D0F5DD
oklch(93.7% 0.05 156.9)
-
Step 200
200
#A3EDC0
oklch(88.5% 0.096 157.1)
-
Step 300
300 (this color)
#31D78A
oklch(77.9% 0.172 157.3)
-
Step 400
400
#00BF75
oklch(70.8% 0.168 157.1)
-
Step 500
500
#00A364
oklch(63% 0.149 157.4)
-
Step 600
600
#008953
oklch(55.5% 0.131 157.3)
-
Step 700
700
#007445
oklch(49.2% 0.117 157)
-
Step 800
800
#005F38
oklch(42.7% 0.101 157.3)
-
Step 900
900
#004F2E
oklch(37.6% 0.089 157.5)
-
Step 950
950
#002F19
oklch(26.9% 0.064 157.1)
#31D78A 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) | #D5C685 | 0.156 |
| Deuteranopia (no green cones) | #C2B88F | 0.153 |
| Tritanopia (no blue cones) | #00D5C3 | 0.079 |
| Achromatopsia (no color) | #BDBDBD | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31D78A
#31D78A
oklch(77.9% 0.172 157.3)
- #FB88DE
#FB88DE
oklch(77.9% 0.172 337.4)
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 #31D78A, closest first.
No curated palette has a color within ΔE 0.04 of #31D78A.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.025
- Aqua Green #12E193 ΔE 0.026
- Emerald #06D6A0 ΔE 0.030
- Weird Green #3AE57F ΔE 0.046
- Greenblue #23C48B ΔE 0.057
- Algae Green #21C36F ΔE 0.060
- Soft Green #6FC276 ΔE 0.060
- Dark Mint #48C072 ΔE 0.062
Use #31D78A 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.