#51CDAB
Closest named color: Medium Aquamarine (#66CDAA). oklch(77% 0.121 171.8), rgb(81, 205, 171).
Aa
Black text reads best on this color (10.67:1).
About this color
#51CDAB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.121 and its hue 172°. 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 10.67:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.67:1 |
| White text | 1.96:1 |
Values
| HEX | #51CDAB |
| RGB | rgb(81, 205, 171) |
| HSL | hsl(164, 55%, 56%) |
| OKLCH | oklch(77% 0.121 171.8) |
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 #51CDAB | 1.96:1 | Fails | Lc -42.0 | Non-text elements, placeholder text |
| Black text on #51CDAB | 10.67:1 | AAA | Lc 66.3 | Content text, not long reading |
| #51CDAB text on white | 1.96:1 | Fails | Lc 37.6 | Non-text elements, placeholder text |
| #51CDAB text on black | 10.67:1 | AAA | Lc -64.8 | 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
#D4F2E7
oklch(93.6% 0.035 171.5)
-
Step 200
200
#ACE8D4
oklch(88.5% 0.067 172.1)
-
Step 300
300 (this color)
#51CDAB
oklch(77% 0.121 171.8)
-
Step 400
400
#00BC96
oklch(70.8% 0.138 171.4)
-
Step 500
500
#00A181
oklch(63.2% 0.122 172)
-
Step 600
600
#00876C
oklch(55.5% 0.108 172.1)
-
Step 700
700
#00725A
oklch(49.2% 0.096 171.5)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#004E3D
oklch(37.8% 0.073 171.8)
-
Step 950
950
#002E23
oklch(26.8% 0.052 171.9)
#51CDAB 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) | #C7C0A9 | 0.125 |
| Deuteranopia (no green cones) | #B5B3AD | 0.120 |
| Tritanopia (no blue cones) | #00CFC3 | 0.037 |
| Achromatopsia (no color) | #B9B9B9 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CDAB
#51CDAB
oklch(77% 0.121 171.8)
- #EF93BC
#EF93BC
oklch(77% 0.121 352.1)
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 #51CDAB, 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 0.038
- Emerald #06D6A0 ΔE 0.041
- Pale Teal #82CBB2 ΔE 0.043
- Medium Turquoise #48D1CC ΔE 0.044
- Greenblue #23C48B ΔE 0.055
- Dark Turquoise #00CED1 ΔE 0.055
- Turquoise #40E0D0 ΔE 0.061
Use #51CDAB 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.