#51B855
Closest named color: Cool Green (#33B864). oklch(69.9% 0.168 144.2), rgb(81, 184, 85).
Aa
Black text reads best on this color (8.33:1).
About this color
#51B855 is a medium-light, vivid green. In OKLCH its lightness is 70%, its chroma 0.168 and its hue 144°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Cool Green (#33B864), ΔE 0.021 away. Black text reads best on it, at 8.33:1.
| Hue family | Greens |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.168) |
| Temperature | in between |
| Nearest name | Cool Green (#33B864) |
| Black text | 8.33:1 |
| White text | 2.51:1 |
Values
| HEX | #51B855 |
| RGB | rgb(81, 184, 85) |
| HSL | hsl(122, 42%, 52%) |
| OKLCH | oklch(69.9% 0.168 144.2) |
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 #51B855 | 2.51:1 | Fails | Lc -54.2 | Large or bold text, headings |
| Black text on #51B855 | 8.33:1 | AAA | Lc 54.9 | Large or bold text, headings |
| #51B855 text on white | 2.51:1 | Fails | Lc 49.1 | Large or bold text, headings |
| #51B855 text on black | 8.33:1 | AAA | Lc -52.9 | 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
#DEF0DD
oklch(93.7% 0.032 143.9)
-
Step 200
200
#C3E4C1
oklch(88.6% 0.059 143.5)
-
Step 300
300
#96D396
oklch(81% 0.105 144.5)
-
Step 400
400 (this color)
#51B855
oklch(69.9% 0.168 144.2)
-
Step 500
500
#00A624
oklch(63% 0.203 144.2)
-
Step 600
600
#008C1D
oklch(55.6% 0.179 144.2)
-
Step 700
700
#007616
oklch(49.1% 0.159 144.1)
-
Step 800
800
#006111
oklch(42.8% 0.138 144.2)
-
Step 900
900
#00510C
oklch(37.8% 0.122 144.2)
-
Step 950
950
#003005
oklch(26.9% 0.086 144.4)
#51B855 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) | #BBA94C | 0.125 |
| Deuteranopia (no green cones) | #AEA05C | 0.124 |
| Tritanopia (no blue cones) | #3FB3A2 | 0.105 |
| Achromatopsia (no color) | #A3A3A3 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B855
#51B855
oklch(69.9% 0.168 144.2)
- #D076D8
#D076D8
oklch(70% 0.167 324.1)
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 #51B855, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Green #33B864 ΔE 0.021
- Leafy Green #51B73B ΔE 0.023
- Dark Pastel Green #56AE57 ΔE 0.030
- Boring Green #63B365 ΔE 0.031
- Turtle Green #75B84F ΔE 0.031
- Dark Mint #48C072 ΔE 0.033
- Dark Mint Green #20C073 ΔE 0.036
- Algae Green #21C36F ΔE 0.036
Use #51B855 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.