#51CFAE
Closest named color: Medium Aquamarine (#66CDAA). oklch(77.5% 0.122 172.7), rgb(81, 207, 174).
Aa
Black text reads best on this color (10.88:1).
About this color
#51CFAE is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.122 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.014 away. Black text reads best on it, at 10.88:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (78%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.88:1 |
| White text | 1.92:1 |
Values
| HEX | #51CFAE |
| RGB | rgb(81, 207, 174) |
| HSL | hsl(164, 57%, 56%) |
| OKLCH | oklch(77.5% 0.122 172.7) |
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 #51CFAE | 1.92:1 | Fails | Lc -40.9 | Non-text elements, placeholder text |
| Black text on #51CFAE | 10.88:1 | AAA | Lc 67.3 | Content text, not long reading |
| #51CFAE text on white | 1.92:1 | Fails | Lc 36.6 | Non-text elements, placeholder text |
| #51CFAE text on black | 10.88:1 | AAA | Lc -65.8 | 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
#EBF9F4
oklch(97% 0.016 172.7)
-
Step 100
100
#D3F2E7
oklch(93.6% 0.036 172.1)
-
Step 200
200
#ABE8D5
oklch(88.4% 0.067 173.5)
-
Step 300
300 (this color)
#51CFAE
oklch(77.5% 0.122 172.7)
-
Step 400
400
#00BB98
oklch(70.6% 0.136 172.9)
-
Step 500
500
#00A182
oklch(63.2% 0.122 172.6)
-
Step 600
600
#00876D
oklch(55.6% 0.107 172.9)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#004E3E
oklch(37.8% 0.073 172.9)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#51CFAE 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) | #C9C2AC | 0.126 |
| Deuteranopia (no green cones) | #B7B5B0 | 0.121 |
| Tritanopia (no blue cones) | #00D1C5 | 0.036 |
| Achromatopsia (no color) | #BBBBBB | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CFAE
#51CFAE
oklch(77.5% 0.122 172.7)
- #F294BD
#F294BD
oklch(77.5% 0.123 352.7)
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 #51CFAE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.014
- Seafoam Blue #78D1B6 ΔE 0.034
- Emerald #06D6A0 ΔE 0.041
- Medium Turquoise #48D1CC ΔE 0.041
- Pale Teal #82CBB2 ΔE 0.042
- Dark Turquoise #00CED1 ΔE 0.054
- Turquoise #40E0D0 ΔE 0.055
- Greenblue #23C48B ΔE 0.060
Use #51CFAE 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.