#51EEE5
Closest named color: Bright Aqua (#0BF9EA). oklch(86.6% 0.13 189.5), rgb(81, 238, 229).
Aa
Black text reads best on this color (14.71:1).
About this color
#51EEE5 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 87%, its chroma 0.130 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Aqua (#0BF9EA), ΔE 0.031 away. Black text reads best on it, at 14.71:1.
| Hue family | Teals and cyans |
| Lightness | light (87%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Bright Aqua (#0BF9EA) |
| Black text | 14.71:1 |
| White text | 1.42:1 |
Values
| HEX | #51EEE5 |
| RGB | rgb(81, 238, 229) |
| HSL | hsl(177, 82%, 63%) |
| OKLCH | oklch(86.6% 0.13 189.5) |
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 #51EEE5 | 1.42:1 | Fails | Lc -23.0 | Dividers and decoration only |
| Black text on #51EEE5 | 14.71:1 | AAA | Lc 83.5 | Fine for body text |
| #51EEE5 text on white | 1.42:1 | Fails | Lc 20.2 | Dividers and decoration only |
| #51EEE5 text on black | 14.71:1 | AAA | Lc -83.3 | 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 200.
-
Step 50
50
#E6FBF9
oklch(97.2% 0.022 189.9)
-
Step 100
100
#C6F5F1
oklch(93.6% 0.048 190)
-
Step 200
200 (this color)
#51EEE5
oklch(86.6% 0.13 189.5)
-
Step 300
300
#00DDD4
oklch(81% 0.14 189.6)
-
Step 400
400
#00B8B1
oklch(70.6% 0.122 190)
-
Step 500
500
#009E97
oklch(63.1% 0.109 189.2)
-
Step 600
600
#00857F
oklch(55.6% 0.096 189.2)
-
Step 700
700
#00706B
oklch(49.2% 0.085 189.4)
-
Step 800
800
#005C58
oklch(42.8% 0.074 189.6)
-
Step 900
900
#004C49
oklch(37.6% 0.065 190.2)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#51EEE5 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) | #E1E2E5 | 0.137 |
| Deuteranopia (no green cones) | #CAD1E6 | 0.129 |
| Tritanopia (no blue cones) | #00F4EB | 0.022 |
| Achromatopsia (no color) | #D8D8D8 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51EEE5
#51EEE5
oklch(86.6% 0.13 189.5)
- #FFBFC8
#FFBFC8
oklch(86.5% 0.074 9.4)
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 #51EEE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Aqua #0BF9EA ΔE 0.031
- Bright Light Blue #26F7FD ΔE 0.034
- Robin's Egg #6DEDFD ΔE 0.041
- Bright Turquoise #0FFEF9 ΔE 0.043
- Bright Cyan #41FDFE ΔE 0.044
- Turquoise #40E0D0 ΔE 0.045
- Cyan #00FFFF ΔE 0.048
- Light Turquoise #7EF4CC ΔE 0.050
Use #51EEE5 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.