#51E1EA
Closest named color: Aqua Blue (#02D8E9). oklch(83.7% 0.121 201.1), rgb(81, 225, 234).
Aa
Black text reads best on this color (13.30:1).
About this color
#51E1EA is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.121 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.037 away. Black text reads best on it, at 13.30:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 13.30:1 |
| White text | 1.57:1 |
Values
| HEX | #51E1EA |
| RGB | rgb(81, 225, 234) |
| HSL | hsl(184, 78%, 62%) |
| OKLCH | oklch(83.7% 0.121 201.1) |
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 #51E1EA | 1.57:1 | Fails | Lc -29.3 | Dividers and decoration only |
| Black text on #51E1EA | 13.30:1 | AAA | Lc 77.8 | Fine for body text |
| #51E1EA text on white | 1.57:1 | Fails | Lc 25.9 | Dividers and decoration only |
| #51E1EA text on black | 13.30:1 | AAA | Lc -77.1 | 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
#EAF9FA
oklch(97.1% 0.016 201.7)
-
Step 100
100
#D0F1F3
oklch(93.5% 0.034 201.1)
-
Step 200
200
#A4E7EB
oklch(88.5% 0.067 200.7)
-
Step 300
300 (this color)
#51E1EA
oklch(83.7% 0.121 201.1)
-
Step 400
400
#00B6BF
oklch(70.6% 0.12 201.1)
-
Step 500
500
#009CA4
oklch(63% 0.107 201.2)
-
Step 600
600
#00838A
oklch(55.5% 0.094 201.4)
-
Step 700
700
#006E74
oklch(49% 0.083 201.4)
-
Step 800
800
#005B5F
oklch(42.8% 0.073 200)
-
Step 900
900
#004B50
oklch(37.6% 0.064 202.5)
-
Step 950
950
#002D30
oklch(27% 0.046 201.8)
#51E1EA 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) | #D1D7EB | 0.123 |
| Deuteranopia (no green cones) | #BAC7EB | 0.113 |
| Tritanopia (no blue cones) | #00E9E3 | 0.033 |
| Achromatopsia (no color) | #CECECE | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51E1EA
#51E1EA
oklch(83.7% 0.121 201.1)
- #FFB3B0
#FFB3B0
oklch(83.8% 0.089 21.7)
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 #51E1EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.037
- Turquoise #40E0D0 ΔE 0.039
- Robin's Egg #6DEDFD ΔE 0.044
- Medium Turquoise #48D1CC ΔE 0.054
- Bright Light Blue #26F7FD ΔE 0.057
- Sky Blue #87CEEB ΔE 0.062
- Bright Aqua #0BF9EA ΔE 0.067
- Dark Turquoise #00CED1 ΔE 0.067
Use #51E1EA 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.