#51BD18
Closest named color: Frog Green (#58BC08). oklch(70.7% 0.212 138.2), rgb(81, 189, 24).
Aa
Black text reads best on this color (8.64:1).
About this color
#51BD18 is a medium-light, vivid green. In OKLCH its lightness is 71%, its chroma 0.212 and its hue 138°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Frog Green (#58BC08), ΔE 0.005 away. Black text reads best on it, at 8.64:1.
| Hue family | Greens |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.212) |
| Temperature | in between |
| Nearest name | Frog Green (#58BC08) |
| Black text | 8.64:1 |
| White text | 2.42:1 |
Values
| HEX | #51BD18 |
| RGB | rgb(81, 189, 24) |
| HSL | hsl(99, 77%, 42%) |
| OKLCH | oklch(70.7% 0.212 138.2) |
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 #51BD18 | 2.42:1 | Fails | Lc -52.4 | Large or bold text, headings |
| Black text on #51BD18 | 8.64:1 | AAA | Lc 56.6 | Large or bold text, headings |
| #51BD18 text on white | 2.42:1 | Fails | Lc 47.4 | Large or bold text, headings |
| #51BD18 text on black | 8.64:1 | AAA | Lc -54.6 | 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
#F0F9ED
oklch(97.2% 0.018 137.8)
-
Step 100
100
#DEF0D8
oklch(93.5% 0.037 137.8)
-
Step 200
200
#C2E5B6
oklch(88.4% 0.073 137.8)
-
Step 300
300
#95D580
oklch(80.9% 0.132 138.3)
-
Step 400
400 (this color)
#51BD18
oklch(70.7% 0.212 138.2)
-
Step 500
500
#41A300
oklch(63.2% 0.196 138.1)
-
Step 600
600
#358900
oklch(55.6% 0.173 138.2)
-
Step 700
700
#2B7300
oklch(49% 0.152 138.2)
-
Step 800
800
#225F00
oklch(42.8% 0.133 138.3)
-
Step 900
900
#1B4F00
oklch(37.7% 0.117 138.3)
-
Step 950
950
#0D2F00
oklch(26.9% 0.084 138.2)
#51BD18 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) | #C3AC00 | 0.137 |
| Deuteranopia (no green cones) | #B6A330 | 0.137 |
| Tritanopia (no blue cones) | #47B6A1 | 0.148 |
| Achromatopsia (no color) | #A6A6A6 | 0.212 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BD18
#51BD18
oklch(70.7% 0.212 138.2)
- #D56DF4
#D56DF4
oklch(70.7% 0.211 317.9)
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 #51BD18, closest first.
No curated palette has a color within ΔE 0.04 of #51BD18.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Frog Green #58BC08 ΔE 0.005
- Leafy Green #51B73B ΔE 0.029
- Shamrock Green #02C14D ΔE 0.036
- Dark Lime Green #7EBD01 ΔE 0.040
- Lime Green #32CD32 ΔE 0.043
- Dark Lime #84B701 ΔE 0.048
- Grass #5CAC2D ΔE 0.052
- Apple #6ECB3C ΔE 0.052
Use #51BD18 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.