#51DEE4
Closest named color: Aqua Blue (#02D8E9). oklch(82.8% 0.119 199.2), rgb(81, 222, 228).
Aa
Black text reads best on this color (12.91:1).
About this color
#51DEE4 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.119 and its hue 199°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.032 away. Black text reads best on it, at 12.91:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.91:1 |
| White text | 1.62:1 |
Values
| HEX | #51DEE4 |
| RGB | rgb(81, 222, 228) |
| HSL | hsl(182, 73%, 61%) |
| OKLCH | oklch(82.8% 0.119 199.2) |
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 #51DEE4 | 1.62:1 | Fails | Lc -31.2 | Non-text elements, placeholder text |
| Black text on #51DEE4 | 12.91:1 | AAA | Lc 76.2 | Fine for body text |
| #51DEE4 text on white | 1.62:1 | Fails | Lc 27.6 | Dividers and decoration only |
| #51DEE4 text on black | 12.91:1 | AAA | Lc -75.3 | 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 300.
-
Step 50
50
#EAF9F9
oklch(97.1% 0.016 196.9)
-
Step 100
100
#D0F1F3
oklch(93.5% 0.034 201.1)
-
Step 200
200
#A5E7EA
oklch(88.5% 0.066 199.6)
-
Step 300
300 (this color)
#51DEE4
oklch(82.8% 0.119 199.2)
-
Step 400
400
#00B7BD
oklch(70.8% 0.12 199)
-
Step 500
500
#009DA2
oklch(63.2% 0.107 198.8)
-
Step 600
600
#008488
oklch(55.7% 0.095 198.5)
-
Step 700
700
#006F73
oklch(49.2% 0.084 199.2)
-
Step 800
800
#005B5E
oklch(42.8% 0.073 198.7)
-
Step 900
900
#004C4E
oklch(37.8% 0.064 197.8)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#51DEE4 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) | #CFD4E5 | 0.123 |
| Deuteranopia (no green cones) | #B8C4E5 | 0.113 |
| Tritanopia (no blue cones) | #00E6DF | 0.032 |
| Achromatopsia (no color) | #CBCBCB | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51DEE4
#51DEE4
oklch(82.8% 0.119 199.2)
- #FFAEAE
#FFAEAE
oklch(82.9% 0.095 19.3)
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 #51DEE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.032
- Turquoise #40E0D0 ΔE 0.033
- Medium Turquoise #48D1CC ΔE 0.044
- Robin's Egg #6DEDFD ΔE 0.054
- Dark Turquoise #00CED1 ΔE 0.058
- Sky Blue #87CEEB ΔE 0.060
- Seafoam Blue #78D1B6 ΔE 0.063
- Bright Light Blue #26F7FD ΔE 0.066
Use #51DEE4 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.