#51BC99
Closest named color: Greeny Blue (#42B395). oklch(72.3% 0.112 168.8), rgb(81, 188, 153).
Aa
Black text reads best on this color (9.00:1).
About this color
#51BC99 is a medium-light, moderately saturated green. In OKLCH its lightness is 72%, its chroma 0.112 and its hue 169°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.029 away. Black text reads best on it, at 9.00:1.
| Hue family | Greens |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.112) |
| Temperature | in between |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 9.00:1 |
| White text | 2.33:1 |
Values
| HEX | #51BC99 |
| RGB | rgb(81, 188, 153) |
| HSL | hsl(160, 44%, 53%) |
| OKLCH | oklch(72.3% 0.112 168.8) |
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 #51BC99 | 2.33:1 | Fails | Lc -50.6 | Large or bold text, headings |
| Black text on #51BC99 | 9.00:1 | AAA | Lc 58.2 | Large or bold text, headings |
| #51BC99 text on white | 2.33:1 | Fails | Lc 45.7 | Large or bold text, headings |
| #51BC99 text on black | 9.00:1 | AAA | Lc -56.3 | 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
#F0F8F4
oklch(97.2% 0.01 164.9)
-
Step 100
100
#DEEEE7
oklch(93.5% 0.019 167.9)
-
Step 200
200
#C1E2D5
oklch(88.5% 0.039 169.6)
-
Step 300
300
#93D0B9
oklch(81% 0.071 169.1)
-
Step 400
400 (this color)
#51BC99
oklch(72.3% 0.112 168.8)
-
Step 500
500
#00A17C
oklch(63% 0.126 169.1)
-
Step 600
600
#008868
oklch(55.7% 0.112 168.9)
-
Step 700
700
#007257
oklch(49.1% 0.098 169.1)
-
Step 800
800
#005E47
oklch(42.8% 0.086 168.9)
-
Step 900
900
#004E3A
oklch(37.7% 0.076 168.5)
-
Step 950
950
#002F22
oklch(27.1% 0.054 168.9)
#51BC99 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) | #B8B097 | 0.115 |
| Deuteranopia (no green cones) | #A8A59B | 0.109 |
| Tritanopia (no blue cones) | #16BDB2 | 0.039 |
| Achromatopsia (no color) | #AAAAAA | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BC99
#51BC99
oklch(72.3% 0.112 168.8)
- #DA88B1
#DA88B1
oklch(72.4% 0.112 348.9)
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 #51BC99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.029
- Green Blue #01C08D ΔE 0.038
- Topaz #13BBAF ΔE 0.039
- Greenblue #23C48B ΔE 0.042
- Light Sea Green #20B2AA ΔE 0.051
- Tea #65AB7C ΔE 0.051
- Faded Green #7BB274 ΔE 0.053
- Medium Aquamarine #66CDAA ΔE 0.054
Use #51BC99 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.