#40C3EB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.3% 0.124 222.7), rgb(64, 195, 235).
Aa
Black text reads best on this color (10.22:1).
About this color
#40C3EB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.124 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.019 away. Black text reads best on it, at 10.22:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.22:1 |
| White text | 2.05:1 |
Values
| HEX | #40C3EB |
| RGB | rgb(64, 195, 235) |
| HSL | hsl(194, 81%, 59%) |
| OKLCH | oklch(76.3% 0.124 222.7) |
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 #40C3EB | 2.05:1 | Fails | Lc -44.2 | Non-text elements, placeholder text |
| Black text on #40C3EB | 10.22:1 | AAA | Lc 64.3 | Content text, not long reading |
| #40C3EB text on white | 2.05:1 | Fails | Lc 39.7 | Non-text elements, placeholder text |
| #40C3EB text on black | 10.22:1 | AAA | Lc -62.7 | 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
#EAF8FE
oklch(97% 0.017 225.2)
-
Step 100
100
#D1F0FB
oklch(93.6% 0.036 221.2)
-
Step 200
200
#A7E4FA
oklch(88.5% 0.069 222.3)
-
Step 300
300 (this color)
#40C3EB
oklch(76.3% 0.124 222.7)
-
Step 400
400
#00B2DB
oklch(70.8% 0.131 222.1)
-
Step 500
500
#0098BD
oklch(63.1% 0.118 223.1)
-
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)
#40C3EB 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) | #ACBEED | 0.099 |
| Deuteranopia (no green cones) | #95AEEB | 0.087 |
| Tritanopia (no blue cones) | #00CFD0 | 0.062 |
| Achromatopsia (no color) | #B5B5B5 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40C3EB
#40C3EB
oklch(76.3% 0.124 222.7)
- #F49771
#F49771
oklch(76.4% 0.124 42.8)
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 #40C3EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.019
- Bright Sky Blue #02CCFE ΔE 0.032
- Deep Sky Blue #00BFFF ΔE 0.037
- Lightblue #7BC8F6 ΔE 0.051
- Dark Turquoise #00CED1 ΔE 0.059
- Aqua Blue #02D8E9 ΔE 0.059
- Sky #82CAFC ΔE 0.062
- Sky Blue #87CEEB ΔE 0.067
Use #40C3EB 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.