#51CFA3
Closest named color: Medium Aquamarine (#66CDAA). oklch(77.2% 0.129 166.7), rgb(81, 207, 163).
Aa
Black text reads best on this color (10.80:1).
About this color
#51CFA3 is a medium-light, moderately saturated green. In OKLCH its lightness is 77%, its chroma 0.129 and its hue 167°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.020 away. Black text reads best on it, at 10.80:1.
| Hue family | Greens |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.129) |
| Temperature | in between |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.80:1 |
| White text | 1.94:1 |
Values
| HEX | #51CFA3 |
| RGB | rgb(81, 207, 163) |
| HSL | hsl(159, 57%, 56%) |
| OKLCH | oklch(77.2% 0.129 166.7) |
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 #51CFA3 | 1.94:1 | Fails | Lc -41.3 | Non-text elements, placeholder text |
| Black text on #51CFA3 | 10.80:1 | AAA | Lc 66.9 | Content text, not long reading |
| #51CFA3 text on white | 1.94:1 | Fails | Lc 37.0 | Non-text elements, placeholder text |
| #51CFA3 text on black | 10.80:1 | AAA | Lc -65.4 | 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
#EBF9F3
oklch(97% 0.017 168.5)
-
Step 100
100
#D3F2E4
oklch(93.5% 0.037 166.6)
-
Step 200
200
#ACE9CF
oklch(88.5% 0.072 166.6)
-
Step 300
300 (this color)
#51CFA3
oklch(77.2% 0.129 166.7)
-
Step 400
400
#00BD8D
oklch(70.8% 0.146 166.7)
-
Step 500
500
#00A278
oklch(63.2% 0.13 166.5)
-
Step 600
600
#008864
oklch(55.6% 0.115 166.4)
-
Step 700
700
#007254
oklch(49% 0.101 166.9)
-
Step 800
800
#005E44
oklch(42.7% 0.088 166.3)
-
Step 900
900
#004E38
oklch(37.6% 0.078 166.4)
-
Step 950
950
#002F20
oklch(27.1% 0.056 165.8)
#51CFA3 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) | #CBC1A1 | 0.130 |
| Deuteranopia (no green cones) | #B9B5A6 | 0.124 |
| Tritanopia (no blue cones) | #00D0C3 | 0.047 |
| Achromatopsia (no color) | #BABABA | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CFA3
#51CFA3
oklch(77.2% 0.129 166.7)
- #F092C5
#F092C5
oklch(77.2% 0.129 346.8)
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 #51CFA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.020
- Emerald #06D6A0 ΔE 0.031
- Seafoam Blue #78D1B6 ΔE 0.044
- Greenblue #23C48B ΔE 0.050
- Pale Teal #82CBB2 ΔE 0.050
- Medium Turquoise #48D1CC ΔE 0.056
- Soft Green #6FC276 ΔE 0.057
- Green Blue #01C08D ΔE 0.060
Use #51CFA3 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.