#51CE71
Closest named color: Seaweed (#18D17B). oklch(75.9% 0.172 149), rgb(81, 206, 113).
Aa
Black text reads best on this color (10.41:1).
About this color
#51CE71 is a medium-light, vivid green. In OKLCH its lightness is 76%, its chroma 0.172 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.022 away. Black text reads best on it, at 10.41:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | vivid (0.172) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 10.41:1 |
| White text | 2.01:1 |
Values
| HEX | #51CE71 |
| RGB | rgb(81, 206, 113) |
| HSL | hsl(135, 56%, 56%) |
| OKLCH | oklch(75.9% 0.172 149) |
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 #51CE71 | 2.01:1 | Fails | Lc -43.2 | Non-text elements, placeholder text |
| Black text on #51CE71 | 10.41:1 | AAA | Lc 65.1 | Content text, not long reading |
| #51CE71 text on white | 2.01:1 | Fails | Lc 38.8 | Non-text elements, placeholder text |
| #51CE71 text on black | 10.41:1 | AAA | Lc -63.6 | 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
#EBFAED
oklch(97% 0.023 149.4)
-
Step 100
100
#D4F4D8
oklch(93.7% 0.05 148.7)
-
Step 200
200
#ADEBB7
oklch(88.4% 0.095 149.1)
-
Step 300
300 (this color)
#51CE71
oklch(75.9% 0.172 149)
-
Step 400
400
#00C154
oklch(70.8% 0.2 149)
-
Step 500
500
#00A547
oklch(63% 0.178 149.1)
-
Step 600
600
#008B3A
oklch(55.6% 0.157 148.9)
-
Step 700
700
#007530
oklch(49.1% 0.138 149)
-
Step 800
800
#006026
oklch(42.7% 0.12 149)
-
Step 900
900
#00501E
oklch(37.6% 0.107 148.8)
-
Step 950
950
#00300F
oklch(27% 0.076 148.8)
#51CE71 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) | #D0BD6A | 0.141 |
| Deuteranopia (no green cones) | #BFB277 | 0.138 |
| Tritanopia (no blue cones) | #2DCAB8 | 0.098 |
| Achromatopsia (no color) | #B7B7B7 | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CE71
#51CE71
oklch(75.9% 0.172 149)
- #EB85E6
#EB85E6
oklch(75.9% 0.172 328.9)
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 #51CE71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.022
- Soft Green #6FC276 ΔE 0.041
- Algae Green #21C36F ΔE 0.042
- Dark Mint #48C072 ΔE 0.042
- Apple #6ECB3C ΔE 0.047
- Dark Mint Green #20C073 ΔE 0.050
- Fresh Green #69D84F ΔE 0.052
- Greenblue #23C48B ΔE 0.053
Use #51CE71 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.