#51EFCA
Closest named color: Aqua Marine (#2EE8BB). oklch(86% 0.142 174), rgb(81, 239, 202).
Aa
Black text reads best on this color (14.54:1).
About this color
#51EFCA is a light, vivid teal or cyan. In OKLCH its lightness is 86%, its chroma 0.142 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Marine (#2EE8BB), ΔE 0.032 away. Black text reads best on it, at 14.54:1.
| Hue family | Teals and cyans |
| Lightness | light (86%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Aqua Marine (#2EE8BB) |
| Black text | 14.54:1 |
| White text | 1.44:1 |
Values
| HEX | #51EFCA |
| RGB | rgb(81, 239, 202) |
| HSL | hsl(166, 83%, 63%) |
| OKLCH | oklch(86% 0.142 174) |
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 #51EFCA | 1.44:1 | Fails | Lc -23.7 | Dividers and decoration only |
| Black text on #51EFCA | 14.54:1 | AAA | Lc 82.9 | Fine for body text |
| #51EFCA text on white | 1.44:1 | Fails | Lc 20.8 | Dividers and decoration only |
| #51EFCA text on black | 14.54:1 | AAA | Lc -82.6 | Fine for body text |
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 200.
-
Step 50
50
#E6FBF4
oklch(97.1% 0.024 173.9)
-
Step 100
100
#C7F6E7
oklch(93.6% 0.052 173.7)
-
Step 200
200 (this color)
#51EFCA
oklch(86% 0.142 174)
-
Step 300
300
#00E0B9
oklch(80.9% 0.154 174)
-
Step 400
400
#00BB9A
oklch(70.7% 0.134 174)
-
Step 500
500
#00A084
oklch(63% 0.119 174.3)
-
Step 600
600
#00876E
oklch(55.6% 0.106 173.6)
-
Step 700
700
#00725D
oklch(49.3% 0.094 174)
-
Step 800
800
#005D4B
oklch(42.7% 0.081 173.5)
-
Step 900
900
#004E3F
oklch(37.8% 0.072 174.1)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#51EFCA 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) | #E7E0C8 | 0.147 |
| Deuteranopia (no green cones) | #D1D0CD | 0.141 |
| Tritanopia (no blue cones) | #00F2E4 | 0.036 |
| Achromatopsia (no color) | #D7D7D7 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51EFCA
#51EFCA
oklch(86% 0.142 174)
- #FFBAD5
#FFBAD5
oklch(86% 0.086 353.8)
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 #51EFCA, closest first.
No curated palette has a color within ΔE 0.04 of #51EFCA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Marine #2EE8BB ΔE 0.032
- Bright Teal #01F9C6 ΔE 0.034
- Light Turquoise #7EF4CC ΔE 0.035
- Bright Aqua #0BF9EA ΔE 0.043
- Turquoise #40E0D0 ΔE 0.048
- Light Teal #90E4C1 ΔE 0.049
- Light Aquamarine #7BFDC7 ΔE 0.051
- Greenish Cyan #2AFEB7 ΔE 0.057
Use #51EFCA 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.