#51CC6F
Closest named color: Seaweed (#18D17B). oklch(75.4% 0.171 148.7), rgb(81, 204, 111).
Aa
Black text reads best on this color (10.21:1).
About this color
#51CC6F is a medium-light, vivid green. In OKLCH its lightness is 75%, its chroma 0.171 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.023 away. Black text reads best on it, at 10.21:1.
| Hue family | Greens |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.171) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 10.21:1 |
| White text | 2.05:1 |
Values
| HEX | #51CC6F |
| RGB | rgb(81, 204, 111) |
| HSL | hsl(135, 55%, 56%) |
| OKLCH | oklch(75.4% 0.171 148.7) |
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 #51CC6F | 2.05:1 | Fails | Lc -44.2 | Non-text elements, placeholder text |
| Black text on #51CC6F | 10.21:1 | AAA | Lc 64.2 | Content text, not long reading |
| #51CC6F text on white | 2.05:1 | Fails | Lc 39.7 | Non-text elements, placeholder text |
| #51CC6F text on black | 10.21:1 | AAA | Lc -62.6 | 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 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
#BFE5C4
oklch(88.6% 0.06 148.8)
-
Step 300
300
#8FD49A
oklch(80.9% 0.107 148.6)
-
Step 400
400 (this color)
#51CC6F
oklch(75.4% 0.171 148.7)
-
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
#00501E
oklch(37.6% 0.107 148.8)
-
Step 950
950
#00300F
oklch(27% 0.076 148.8)
#51CC6F 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) | #CEBC68 | 0.139 |
| Deuteranopia (no green cones) | #BEB075 | 0.138 |
| Tritanopia (no blue cones) | #2FC8B6 | 0.098 |
| Achromatopsia (no color) | #B5B5B5 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CC6F
#51CC6F
oklch(75.4% 0.171 148.7)
- #E984E4
#E984E4
oklch(75.5% 0.171 328.9)
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 #51CC6F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.023
- Dark Mint #48C072 ΔE 0.037
- Algae Green #21C36F ΔE 0.037
- Soft Green #6FC276 ΔE 0.039
- Dark Mint Green #20C073 ΔE 0.046
- Apple #6ECB3C ΔE 0.046
- Greenblue #23C48B ΔE 0.051
- Fresh Green #69D84F ΔE 0.055
Use #51CC6F 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.