#51BB63
Closest named color: Dark Mint (#48C072). oklch(70.9% 0.159 147.1), rgb(81, 187, 99).
Aa
Black text reads best on this color (8.63:1).
About this color
#51BB63 is a medium-light, vivid green. In OKLCH its lightness is 71%, its chroma 0.159 and its hue 147°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Mint (#48C072), ΔE 0.018 away. Black text reads best on it, at 8.63:1.
| Hue family | Greens |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.159) |
| Temperature | in between |
| Nearest name | Dark Mint (#48C072) |
| Black text | 8.63:1 |
| White text | 2.43:1 |
Values
| HEX | #51BB63 |
| RGB | rgb(81, 187, 99) |
| HSL | hsl(130, 44%, 53%) |
| OKLCH | oklch(70.9% 0.159 147.1) |
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 #51BB63 | 2.43:1 | Fails | Lc -52.5 | Large or bold text, headings |
| Black text on #51BB63 | 8.63:1 | AAA | Lc 56.4 | Large or bold text, headings |
| #51BB63 text on white | 2.43:1 | Fails | Lc 47.5 | Large or bold text, headings |
| #51BB63 text on black | 8.63:1 | AAA | Lc -54.5 | Large or bold text, headings |
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
#F0F8F0
oklch(97.1% 0.014 145.5)
-
Step 100
100
#DEEFDF
oklch(93.5% 0.028 147)
-
Step 200
200
#C2E4C4
oklch(88.6% 0.056 146.7)
-
Step 300
300
#95D29B
oklch(80.8% 0.099 147.1)
-
Step 400
400 (this color)
#51BB63
oklch(70.9% 0.159 147.1)
-
Step 500
500
#00A63C
oklch(63.2% 0.188 147.1)
-
Step 600
600
#008B31
oklch(55.5% 0.165 147.1)
-
Step 700
700
#007528
oklch(49% 0.145 147.1)
-
Step 800
800
#00601F
oklch(42.6% 0.127 147)
-
Step 900
900
#005019
oklch(37.6% 0.111 147.2)
-
Step 950
950
#00300C
oklch(26.9% 0.079 147.3)
#51BB63 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) | #BDAC5C | 0.125 |
| Deuteranopia (no green cones) | #AFA269 | 0.125 |
| Tritanopia (no blue cones) | #3AB7A6 | 0.093 |
| Achromatopsia (no color) | #A6A6A6 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BB63
#51BB63
oklch(70.9% 0.159 147.1)
- #D47AD4
#D47AD4
oklch(70.8% 0.159 327.1)
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 #51BB63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Mint #48C072 ΔE 0.018
- Cool Green #33B864 ΔE 0.021
- Dark Mint Green #20C073 ΔE 0.026
- Boring Green #63B365 ΔE 0.027
- Algae Green #21C36F ΔE 0.027
- Turtle Green #75B84F ΔE 0.032
- Dark Pastel Green #56AE57 ΔE 0.036
- Medium Sea Green #3CB371 ΔE 0.036
Use #51BB63 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.