#51B552
Closest named color: Cool Green (#33B864). oklch(69.1% 0.166 143.7), rgb(81, 181, 82).
Aa
Black text reads best on this color (8.08:1).
About this color
#51B552 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.166 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 0.022 away. Black text reads best on it, at 8.08:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.166) |
| Temperature | in between |
| Nearest name | Cool Green (#33B864) |
| Black text | 8.08:1 |
| White text | 2.59:1 |
Values
| HEX | #51B552 |
| RGB | rgb(81, 181, 82) |
| HSL | hsl(121, 40%, 51%) |
| OKLCH | oklch(69.1% 0.166 143.7) |
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 #51B552 | 2.59:1 | Fails | Lc -55.6 | Large or bold text, headings |
| Black text on #51B552 | 8.08:1 | AAA | Lc 53.6 | Large or bold text, headings |
| #51B552 text on white | 2.59:1 | Fails | Lc 50.4 | Large or bold text, headings |
| #51B552 text on black | 8.08:1 | AAA | Lc -51.5 | 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
#DEEFDD
oklch(93.5% 0.03 143.8)
-
Step 200
200
#C3E4C1
oklch(88.6% 0.059 143.5)
-
Step 300
300
#98D295
oklch(80.8% 0.103 143.4)
-
Step 400
400 (this color)
#51B552
oklch(69.1% 0.166 143.7)
-
Step 500
500
#00A71D
oklch(63.2% 0.207 143.7)
-
Step 600
600
#008C17
oklch(55.5% 0.182 143.7)
-
Step 700
700
#007611
oklch(49.1% 0.161 143.6)
-
Step 800
800
#00610C
oklch(42.7% 0.14 143.6)
-
Step 900
900
#005109
oklch(37.7% 0.123 143.7)
-
Step 950
950
#003003
oklch(26.8% 0.088 143.6)
#51B552 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) | #B8A649 | 0.122 |
| Deuteranopia (no green cones) | #AB9D59 | 0.122 |
| Tritanopia (no blue cones) | #41B09F | 0.105 |
| Achromatopsia (no color) | #A1A1A1 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B552
#51B552
oklch(69.1% 0.166 143.7)
- #CC74D5
#CC74D5
oklch(69.1% 0.165 323.7)
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 #51B552, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Green #33B864 ΔE 0.022
- Dark Pastel Green #56AE57 ΔE 0.023
- Leafy Green #51B73B ΔE 0.023
- Boring Green #63B365 ΔE 0.031
- Medium Green #39AD48 ΔE 0.032
- Grass #5CAC2D ΔE 0.033
- Shamrock #01B44C ΔE 0.035
- Turtle Green #75B84F ΔE 0.035
Use #51B552 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.