#40D0FB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(80% 0.132 222.5), rgb(64, 208, 251).
Aa
Black text reads best on this color (11.63:1).
About this color
#40D0FB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.132 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.021 away. Black text reads best on it, at 11.63:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.63:1 |
| White text | 1.80:1 |
Values
| HEX | #40D0FB |
| RGB | rgb(64, 208, 251) |
| HSL | hsl(194, 96%, 62%) |
| OKLCH | oklch(80% 0.132 222.5) |
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 #40D0FB | 1.80:1 | Fails | Lc -37.2 | Non-text elements, placeholder text |
| Black text on #40D0FB | 11.63:1 | AAA | Lc 70.7 | Content text, not long reading |
| #40D0FB text on white | 1.80:1 | Fails | Lc 33.1 | Non-text elements, placeholder text |
| #40D0FB text on black | 11.63:1 | AAA | Lc -69.5 | Content text, not long reading |
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
#E9F8FE
oklch(97% 0.018 223.6)
-
Step 100
100
#CFF0FD
oklch(93.5% 0.039 223.6)
-
Step 200
200
#A3E5FC
oklch(88.6% 0.073 221.6)
-
Step 300
300 (this color)
#40D0FB
oklch(80% 0.132 222.5)
-
Step 400
400
#00B2DB
oklch(70.8% 0.131 222.1)
-
Step 500
500
#0098BC
oklch(63% 0.117 222.5)
-
Step 600
600
#00809F
oklch(55.6% 0.103 222.6)
-
Step 700
700
#006B86
oklch(49% 0.091 223.1)
-
Step 800
800
#00586E
oklch(42.7% 0.079 222.3)
-
Step 900
900
#00495C
oklch(37.6% 0.07 222.6)
-
Step 950
950
#002B38
oklch(26.8% 0.05 223.6)
#40D0FB 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) | #B7CBFD | 0.106 |
| Deuteranopia (no green cones) | #9EB9FB | 0.093 |
| Tritanopia (no blue cones) | #00DDDE | 0.065 |
| Achromatopsia (no color) | #C1C1C1 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40D0FB
#40D0FB
oklch(80% 0.132 222.5)
- #FFA37F
#FFA37F
oklch(80% 0.12 42.1)
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 #40D0FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.021
- Bright Sky Blue #02CCFE ΔE 0.021
- Aqua Blue #02D8E9 ΔE 0.042
- Lightblue #7BC8F6 ΔE 0.042
- Sky #82CAFC ΔE 0.048
- Light Sky Blue #87CEFA ΔE 0.051
- Sky Blue #87CEEB ΔE 0.053
- Deep Sky Blue #00BFFF ΔE 0.055
Use #40D0FB 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.