#40E3FF
Closest named color: Robin's Egg (#6DEDFD). oklch(84.6% 0.134 212), rgb(64, 227, 255).
Aa
Black text reads best on this color (13.64:1).
About this color
#40E3FF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 85%, its chroma 0.134 and its hue 212°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.041 away. Black text reads best on it, at 13.64:1.
| Hue family | Teals and cyans |
| Lightness | light (85%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 13.64:1 |
| White text | 1.53:1 |
Values
| HEX | #40E3FF |
| RGB | rgb(64, 227, 255) |
| HSL | hsl(189, 100%, 63%) |
| OKLCH | oklch(84.6% 0.134 212) |
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 #40E3FF | 1.53:1 | Fails | Lc -27.7 | Dividers and decoration only |
| Black text on #40E3FF | 13.64:1 | AAA | Lc 79.3 | Fine for body text |
| #40E3FF text on white | 1.53:1 | Fails | Lc 24.4 | Dividers and decoration only |
| #40E3FF text on black | 13.64:1 | AAA | Lc -78.7 | 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
#E9F9FC
oklch(97.1% 0.017 210.2)
-
Step 100
100
#CDF1F9
oklch(93.5% 0.039 212.6)
-
Step 200
200
#9FE7F6
oklch(88.6% 0.074 212.1)
-
Step 300
300 (this color)
#40E3FF
oklch(84.6% 0.134 212)
-
Step 400
400
#00B4CD
oklch(70.7% 0.123 212.1)
-
Step 500
500
#009AB0
oklch(63% 0.11 212.4)
-
Step 600
600
#008294
oklch(55.7% 0.097 211.6)
-
Step 700
700
#006D7D
oklch(49.1% 0.086 212.3)
-
Step 800
800
#005967
oklch(42.6% 0.075 213)
-
Step 900
900
#004A56
oklch(37.6% 0.066 213)
-
Step 950
950
#002C34
oklch(26.9% 0.047 213.2)
#40E3FF 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) | #CDDBFF | 0.123 |
| Deuteranopia (no green cones) | #B3C8FF | 0.112 |
| Tritanopia (no blue cones) | #00EEEC | 0.048 |
| Achromatopsia (no color) | #D0D0D0 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40E3FF
#40E3FF
oklch(84.6% 0.134 212)
- #FFB8AA
#FFB8AA
oklch(84.5% 0.085 31.4)
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 #40E3FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.041
- Aqua Blue #02D8E9 ΔE 0.044
- Bright Light Blue #26F7FD ΔE 0.056
- Sky Blue #87CEEB ΔE 0.065
- Turquoise #40E0D0 ΔE 0.066
- Robin Egg Blue #8AF1FE ΔE 0.066
- Light Sky Blue #87CEFA ΔE 0.067
- Bright Sky Blue #02CCFE ΔE 0.068
Use #40E3FF 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.