#51CD9D
Closest named color: Medium Aquamarine (#66CDAA). oklch(76.6% 0.131 164.4), rgb(81, 205, 157).
Aa
Black text reads best on this color (10.56:1).
About this color
#51CD9D is a medium-light, moderately saturated green. In OKLCH its lightness is 77%, its chroma 0.131 and its hue 164°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.026 away. Black text reads best on it, at 10.56:1.
| Hue family | Greens |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.131) |
| Temperature | in between |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.56:1 |
| White text | 1.98:1 |
Values
| HEX | #51CD9D |
| RGB | rgb(81, 205, 157) |
| HSL | hsl(157, 55%, 56%) |
| OKLCH | oklch(76.6% 0.131 164.4) |
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 #51CD9D | 1.98:1 | Fails | Lc -42.5 | Non-text elements, placeholder text |
| Black text on #51CD9D | 10.56:1 | AAA | Lc 65.8 | Content text, not long reading |
| #51CD9D text on white | 1.98:1 | Fails | Lc 38.1 | Non-text elements, placeholder text |
| #51CD9D text on black | 10.56:1 | AAA | Lc -64.3 | Content text, not long reading |
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 300.
-
Step 50
50
#EBF9F2
oklch(97% 0.017 164.7)
-
Step 100
100
#D4F2E3
oklch(93.5% 0.037 164.1)
-
Step 200
200
#ACE9CD
oklch(88.5% 0.073 164.8)
-
Step 300
300 (this color)
#51CD9D
oklch(76.6% 0.131 164.4)
-
Step 400
400
#00BD88
oklch(70.7% 0.15 164.5)
-
Step 500
500
#00A274
oklch(63.1% 0.134 164.5)
-
Step 600
600
#008861
oklch(55.5% 0.117 164.6)
-
Step 700
700
#007351
oklch(49.2% 0.104 164.3)
-
Step 800
800
#005E42
oklch(42.7% 0.09 164.7)
-
Step 900
900
#004E36
oklch(37.5% 0.079 164.5)
-
Step 950
950
#002F1F
oklch(27% 0.057 164.4)
#51CD9D 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) | #C9BF9A | 0.129 |
| Deuteranopia (no green cones) | #B8B3A0 | 0.124 |
| Tritanopia (no blue cones) | #00CDC0 | 0.051 |
| Achromatopsia (no color) | #B8B8B8 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CD9D
#51CD9D
oklch(76.6% 0.131 164.4)
- #ED90C7
#ED90C7
oklch(76.6% 0.13 344.3)
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 #51CD9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.026
- Emerald #06D6A0 ΔE 0.031
- Greenblue #23C48B ΔE 0.042
- Soft Green #6FC276 ΔE 0.049
- Seafoam Blue #78D1B6 ΔE 0.050
- Green Blue #01C08D ΔE 0.053
- Pale Teal #82CBB2 ΔE 0.055
- Seaweed #18D17B ΔE 0.058
Use #51CD9D 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.