#51BB61
Closest named color: Dark Mint (#48C072). oklch(70.8% 0.161 146.6), rgb(81, 187, 97).
Aa
Black text reads best on this color (8.63:1).
About this color
#51BB61 is a medium-light, vivid green. In OKLCH its lightness is 71%, its chroma 0.161 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 0.020 away. Black text reads best on it, at 8.63:1.
| Hue family | Greens |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.161) |
| Temperature | in between |
| Nearest name | Dark Mint (#48C072) |
| Black text | 8.63:1 |
| White text | 2.43:1 |
Values
| HEX | #51BB61 |
| RGB | rgb(81, 187, 97) |
| HSL | hsl(129, 44%, 53%) |
| OKLCH | oklch(70.8% 0.161 146.6) |
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 #51BB61 | 2.43:1 | Fails | Lc -52.6 | Large or bold text, headings |
| Black text on #51BB61 | 8.63:1 | AAA | Lc 56.4 | Large or bold text, headings |
| #51BB61 text on white | 2.43:1 | Fails | Lc 47.6 | Large or bold text, headings |
| #51BB61 text on black | 8.63:1 | AAA | Lc -54.4 | 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
#DEF0DF
oklch(93.7% 0.03 146.9)
-
Step 200
200
#C2E4C4
oklch(88.6% 0.056 146.7)
-
Step 300
300
#95D39A
oklch(81% 0.102 146.6)
-
Step 400
400 (this color)
#51BB61
oklch(70.8% 0.161 146.6)
-
Step 500
500
#00A639
oklch(63.1% 0.19 146.6)
-
Step 600
600
#008C2F
oklch(55.7% 0.167 146.6)
-
Step 700
700
#007526
oklch(49% 0.147 146.7)
-
Step 800
800
#00601E
oklch(42.6% 0.127 146.7)
-
Step 900
900
#005017
oklch(37.6% 0.113 146.6)
-
Step 950
950
#00300B
oklch(26.9% 0.08 146.8)
#51BB61 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) | #BDAC5A | 0.125 |
| Deuteranopia (no green cones) | #AFA267 | 0.125 |
| Tritanopia (no blue cones) | #3BB7A6 | 0.096 |
| Achromatopsia (no color) | #A6A6A6 | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BB61
#51BB61
oklch(70.8% 0.161 146.6)
- #D47AD5
#D47AD5
oklch(70.9% 0.16 326.7)
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 #51BB61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Mint #48C072 ΔE 0.020
- Cool Green #33B864 ΔE 0.021
- Dark Mint Green #20C073 ΔE 0.026
- Algae Green #21C36F ΔE 0.028
- Boring Green #63B365 ΔE 0.028
- Turtle Green #75B84F ΔE 0.031
- Dark Pastel Green #56AE57 ΔE 0.036
- Leafy Green #51B73B ΔE 0.036
Use #51BB61 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.