#51B05E
Closest named color: Dark Pastel Green (#56AE57). oklch(68% 0.148 146.5), rgb(81, 176, 94).
Aa
Black text reads best on this color (7.72:1).
About this color
#51B05E is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.148 and its hue 146°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Pastel Green (#56AE57), ΔE 0.008 away. Black text reads best on it, at 7.72:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.148) |
| Temperature | in between |
| Nearest name | Dark Pastel Green (#56AE57) |
| Black text | 7.72:1 |
| White text | 2.71:1 |
Values
| HEX | #51B05E |
| RGB | rgb(81, 176, 94) |
| HSL | hsl(128, 38%, 50%) |
| OKLCH | oklch(68% 0.148 146.5) |
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 #51B05E | 2.71:1 | Fails | Lc -57.6 | Large or bold text, headings |
| Black text on #51B05E | 7.72:1 | AAA | Lc 51.6 | Large or bold text, headings |
| #51B05E text on white | 2.71:1 | Fails | Lc 52.4 | Large or bold text, headings |
| #51B05E text on black | 7.72:1 | AAA | Lc -49.5 | 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
#F0F8F1
oklch(97.1% 0.013 149.3)
-
Step 100
100
#DFEFE0
oklch(93.6% 0.026 147.1)
-
Step 200
200
#C4E3C6
oklch(88.5% 0.051 146.9)
-
Step 300
300
#99D19D
oklch(80.8% 0.093 146.5)
-
Step 400
400 (this color)
#51B05E
oklch(68% 0.148 146.5)
-
Step 500
500
#02A638
oklch(63.1% 0.19 146.4)
-
Step 600
600
#008C2E
oklch(55.7% 0.168 146.5)
-
Step 700
700
#007525
oklch(49% 0.148 146.5)
-
Step 800
800
#00601D
oklch(42.6% 0.128 146.5)
-
Step 900
900
#005017
oklch(37.6% 0.113 146.6)
-
Step 950
950
#02300C
oklch(27% 0.078 146.6)
#51B05E 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) | #B2A258 | 0.116 |
| Deuteranopia (no green cones) | #A59964 | 0.115 |
| Tritanopia (no blue cones) | #3FAC9C | 0.088 |
| Achromatopsia (no color) | #9D9D9D | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B05E
#51B05E
oklch(68% 0.148 146.5)
- #C775C8
#C775C8
oklch(68% 0.148 326.6)
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 #51B05E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Pastel Green #56AE57 ΔE 0.008
- Algae #54AC68 ΔE 0.020
- Boring Green #63B365 ΔE 0.021
- Fern #63A950 ΔE 0.023
- Medium Sea Green #3CB371 ΔE 0.023
- Jade Green #2BAF6A ΔE 0.025
- Cool Green #33B864 ΔE 0.025
- Seaweed Green #35AD6B ΔE 0.026
Use #51B05E 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.