#51CFAB
Closest named color: Medium Aquamarine (#66CDAA). oklch(77.5% 0.124 171), rgb(81, 207, 171).
Aa
Black text reads best on this color (10.86:1).
About this color
#51CFAB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.124 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.015 away. Black text reads best on it, at 10.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.86:1 |
| White text | 1.93:1 |
Values
| HEX | #51CFAB |
| RGB | rgb(81, 207, 171) |
| HSL | hsl(163, 57%, 56%) |
| OKLCH | oklch(77.5% 0.124 171) |
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 #51CFAB | 1.93:1 | Fails | Lc -41.1 | Non-text elements, placeholder text |
| Black text on #51CFAB | 10.86:1 | AAA | Lc 67.2 | Content text, not long reading |
| #51CFAB text on white | 1.93:1 | Fails | Lc 36.7 | Non-text elements, placeholder text |
| #51CFAB text on black | 10.86:1 | AAA | Lc -65.7 | 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
#ABE8D3
oklch(88.4% 0.068 171.4)
-
Step 300
300 (this color)
#51CFAB
oklch(77.5% 0.124 171)
-
Step 400
400
#00BC95
oklch(70.8% 0.139 170.9)
-
Step 500
500
#00A17F
oklch(63.1% 0.124 170.8)
-
Step 600
600
#00876B
oklch(55.5% 0.108 171.4)
-
Step 700
700
#007259
oklch(49.1% 0.097 170.7)
-
Step 800
800
#005D49
oklch(42.6% 0.083 171.6)
-
Step 900
900
#004E3C
oklch(37.7% 0.074 170.6)
-
Step 950
950
#002F23
oklch(27.2% 0.053 170.5)
#51CFAB 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) | #C9C2A9 | 0.127 |
| Deuteranopia (no green cones) | #B7B5AD | 0.121 |
| Tritanopia (no blue cones) | #00D1C5 | 0.039 |
| Achromatopsia (no color) | #BABABA | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CFAB
#51CFAB
oklch(77.5% 0.124 171)
- #F194BF
#F194BF
oklch(77.4% 0.123 351.1)
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 #51CFAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.015
- Seafoam Blue #78D1B6 ΔE 0.037
- Emerald #06D6A0 ΔE 0.038
- Pale Teal #82CBB2 ΔE 0.044
- Medium Turquoise #48D1CC ΔE 0.045
- Greenblue #23C48B ΔE 0.057
- Dark Turquoise #00CED1 ΔE 0.057
- Turquoise #40E0D0 ΔE 0.058
Use #51CFAB 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.