#51B758
Closest named color: Cool Green (#33B864). oklch(69.7% 0.164 144.8), rgb(81, 183, 88).
Aa
Black text reads best on this color (8.26:1).
About this color
#51B758 is a medium-light, vivid green. In OKLCH its lightness is 70%, its chroma 0.164 and its hue 145°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Cool Green (#33B864), ΔE 0.019 away. Black text reads best on it, at 8.26:1.
| Hue family | Greens |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.164) |
| Temperature | in between |
| Nearest name | Cool Green (#33B864) |
| Black text | 8.26:1 |
| White text | 2.54:1 |
Values
| HEX | #51B758 |
| RGB | rgb(81, 183, 88) |
| HSL | hsl(124, 41%, 52%) |
| OKLCH | oklch(69.7% 0.164 144.8) |
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 #51B758 | 2.54:1 | Fails | Lc -54.6 | Large or bold text, headings |
| Black text on #51B758 | 8.26:1 | AAA | Lc 54.5 | Large or bold text, headings |
| #51B758 text on white | 2.54:1 | Fails | Lc 49.5 | Large or bold text, headings |
| #51B758 text on black | 8.26:1 | AAA | Lc -52.5 | 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
#DEEFDE
oklch(93.5% 0.029 145.3)
-
Step 200
200
#C3E4C2
oklch(88.6% 0.058 144.3)
-
Step 300
300
#97D297
oklch(80.8% 0.102 144.6)
-
Step 400
400 (this color)
#51B758
oklch(69.7% 0.164 144.8)
-
Step 500
500
#00A62B
oklch(63% 0.199 144.9)
-
Step 600
600
#008C22
oklch(55.6% 0.176 144.8)
-
Step 700
700
#00761B
oklch(49.2% 0.156 144.8)
-
Step 800
800
#006115
oklch(42.8% 0.135 144.8)
-
Step 900
900
#005110
oklch(37.8% 0.119 144.9)
-
Step 950
950
#003006
oklch(26.9% 0.085 144.8)
#51B758 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) | #BAA850 | 0.124 |
| Deuteranopia (no green cones) | #AD9F5F | 0.123 |
| Tritanopia (no blue cones) | #3FB3A1 | 0.100 |
| Achromatopsia (no color) | #A2A2A2 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B758
#51B758
oklch(69.7% 0.164 144.8)
- #CF76D5
#CF76D5
oklch(69.7% 0.164 324.8)
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 #51B758, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Green #33B864 ΔE 0.019
- Dark Pastel Green #56AE57 ΔE 0.026
- Boring Green #63B365 ΔE 0.027
- Leafy Green #51B73B ΔE 0.027
- Dark Mint #48C072 ΔE 0.032
- Turtle Green #75B84F ΔE 0.032
- Dark Mint Green #20C073 ΔE 0.035
- Medium Sea Green #3CB371 ΔE 0.036
Use #51B758 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.