#51CD87
Closest named color: Seaweed (#18D17B). oklch(76.1% 0.15 155.4), rgb(81, 205, 135).
Aa
Black text reads best on this color (10.43:1).
About this color
#51CD87 is a medium-light, vivid green. In OKLCH its lightness is 76%, its chroma 0.150 and its hue 155°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.033 away. Black text reads best on it, at 10.43:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | vivid (0.150) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 10.43:1 |
| White text | 2.01:1 |
Values
| HEX | #51CD87 |
| RGB | rgb(81, 205, 135) |
| HSL | hsl(146, 55%, 56%) |
| OKLCH | oklch(76.1% 0.15 155.4) |
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 #51CD87 | 2.01:1 | Fails | Lc -43.2 | Non-text elements, placeholder text |
| Black text on #51CD87 | 10.43:1 | AAA | Lc 65.2 | Content text, not long reading |
| #51CD87 text on white | 2.01:1 | Fails | Lc 38.7 | Non-text elements, placeholder text |
| #51CD87 text on black | 10.43:1 | 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
#EBFAF0
oklch(97.1% 0.021 156.8)
-
Step 100
100
#D4F3DE
oklch(93.6% 0.043 155.9)
-
Step 200
200
#ADEAC2
oklch(88.5% 0.083 155.6)
-
Step 300
300 (this color)
#51CD87
oklch(76.1% 0.15 155.4)
-
Step 400
400
#00BF6F
oklch(70.7% 0.174 155.3)
-
Step 500
500
#00A45F
oklch(63.2% 0.155 155.5)
-
Step 600
600
#008A4F
oklch(55.7% 0.136 155.4)
-
Step 700
700
#007441
oklch(49.1% 0.121 155.2)
-
Step 800
800
#005F35
oklch(42.7% 0.104 155.6)
-
Step 900
900
#004F2B
oklch(37.6% 0.092 155.5)
-
Step 950
950
#003018
oklch(27.2% 0.067 155.5)
#51CD87 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) | #CCBE83 | 0.134 |
| Deuteranopia (no green cones) | #BCB28B | 0.132 |
| Tritanopia (no blue cones) | #1ECBBB | 0.074 |
| Achromatopsia (no color) | #B7B7B7 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CD87
#51CD87
oklch(76.1% 0.15 155.4)
- #EB8AD6
#EB8AD6
oklch(76% 0.15 335.4)
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 #51CD87, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.033
- Soft Green #6FC276 ΔE 0.034
- Emerald #06D6A0 ΔE 0.036
- Greenblue #23C48B ΔE 0.038
- Dark Mint #48C072 ΔE 0.041
- Algae Green #21C36F ΔE 0.048
- Dark Mint Green #20C073 ΔE 0.051
- Green Blue #01C08D ΔE 0.052
Use #51CD87 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.