#40C4EF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.7% 0.127 224.2), rgb(64, 196, 239).
Aa
Black text reads best on this color (10.36:1).
About this color
#40C4EF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.127 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.016 away. Black text reads best on it, at 10.36:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.36:1 |
| White text | 2.02:1 |
Values
| HEX | #40C4EF |
| RGB | rgb(64, 196, 239) |
| HSL | hsl(195, 85%, 59%) |
| OKLCH | oklch(76.7% 0.127 224.2) |
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 #40C4EF | 2.02:1 | Fails | Lc -43.5 | Non-text elements, placeholder text |
| Black text on #40C4EF | 10.36:1 | AAA | Lc 64.9 | Content text, not long reading |
| #40C4EF text on white | 2.02:1 | Fails | Lc 39.0 | Non-text elements, placeholder text |
| #40C4EF text on black | 10.36:1 | AAA | Lc -63.3 | 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
#D1F0FC
oklch(93.6% 0.036 223.1)
-
Step 200
200
#A7E4FC
oklch(88.6% 0.07 224.3)
-
Step 300
300 (this color)
#40C4EF
oklch(76.7% 0.127 224.2)
-
Step 400
400
#00B1DE
oklch(70.7% 0.133 224.4)
-
Step 500
500
#0098BF
oklch(63.2% 0.119 224.4)
-
Step 600
600
#0080A1
oklch(55.7% 0.105 224.1)
-
Step 700
700
#006B87
oklch(49% 0.092 224)
-
Step 800
800
#005870
oklch(42.8% 0.081 224.4)
-
Step 900
900
#00495D
oklch(37.7% 0.071 223.8)
-
Step 950
950
#002B39
oklch(26.9% 0.051 225.5)
#40C4EF 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) | #ACC0F1 | 0.098 |
| Deuteranopia (no green cones) | #94AFEF | 0.086 |
| Tritanopia (no blue cones) | #00D1D2 | 0.066 |
| Achromatopsia (no color) | #B6B6B6 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40C4EF
#40C4EF
oklch(76.7% 0.127 224.2)
- #F6986E
#F6986E
oklch(76.7% 0.127 44.5)
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 #40C4EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.016
- Bright Sky Blue #02CCFE ΔE 0.027
- Deep Sky Blue #00BFFF ΔE 0.035
- Lightblue #7BC8F6 ΔE 0.048
- Sky #82CAFC ΔE 0.059
- Aqua Blue #02D8E9 ΔE 0.059
- Dark Turquoise #00CED1 ΔE 0.062
- Sky Blue #87CEEB ΔE 0.065
Use #40C4EF 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.