#51CA71
Closest named color: Seaweed (#18D17B). oklch(74.9% 0.167 149.3), rgb(81, 202, 113).
Aa
Black text reads best on this color (10.03:1).
About this color
#51CA71 is a medium-light, vivid green. In OKLCH its lightness is 75%, its chroma 0.167 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.025 away. Black text reads best on it, at 10.03:1.
| Hue family | Greens |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.167) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 10.03:1 |
| White text | 2.09:1 |
Values
| HEX | #51CA71 |
| RGB | rgb(81, 202, 113) |
| HSL | hsl(136, 53%, 55%) |
| OKLCH | oklch(74.9% 0.167 149.3) |
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 #51CA71 | 2.09:1 | Fails | Lc -45.2 | Large or bold text, headings |
| Black text on #51CA71 | 10.03:1 | AAA | Lc 63.3 | Content text, not long reading |
| #51CA71 text on white | 2.09:1 | Fails | Lc 40.6 | Non-text elements, placeholder text |
| #51CA71 text on black | 10.03:1 | AAA | Lc -61.7 | 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 400.
-
Step 50
50
#EFF8F0
oklch(97% 0.014 148.8)
-
Step 100
100
#DDF0DF
oklch(93.6% 0.03 148.4)
-
Step 200
200
#BFE4C5
oklch(88.4% 0.057 149.8)
-
Step 300
300
#90D49C
oklch(81% 0.104 149.2)
-
Step 400
400 (this color)
#51CA71
oklch(74.9% 0.167 149.3)
-
Step 500
500
#00A548
oklch(63% 0.177 149.3)
-
Step 600
600
#008B3C
oklch(55.6% 0.155 149.4)
-
Step 700
700
#007531
oklch(49.1% 0.138 149.3)
-
Step 800
800
#006027
oklch(42.7% 0.12 149.3)
-
Step 900
900
#00501F
oklch(37.7% 0.106 149.2)
-
Step 950
950
#003010
oklch(27% 0.075 149.4)
#51CA71 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) | #CBBA6A | 0.136 |
| Deuteranopia (no green cones) | #BCAF77 | 0.135 |
| Tritanopia (no blue cones) | #2FC6B4 | 0.093 |
| Achromatopsia (no color) | #B3B3B3 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CA71
#51CA71
oklch(74.9% 0.167 149.3)
- #E684E0
#E684E0
oklch(74.9% 0.165 329.3)
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 #51CA71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.025
- Dark Mint #48C072 ΔE 0.031
- Algae Green #21C36F ΔE 0.033
- Soft Green #6FC276 ΔE 0.033
- Dark Mint Green #20C073 ΔE 0.040
- Greenblue #23C48B ΔE 0.045
- Apple #6ECB3C ΔE 0.051
- Turtle Green #75B84F ΔE 0.053
Use #51CA71 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.