#40CDF0
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(78.9% 0.126 218.4), rgb(64, 205, 240).
Aa
Black text reads best on this color (11.20:1).
About this color
#40CDF0 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 79%, its chroma 0.126 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.012 away. Black text reads best on it, at 11.20:1.
| Hue family | Teals and cyans |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.20:1 |
| White text | 1.87:1 |
Values
| HEX | #40CDF0 |
| RGB | rgb(64, 205, 240) |
| HSL | hsl(192, 85%, 60%) |
| OKLCH | oklch(78.9% 0.126 218.4) |
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 #40CDF0 | 1.87:1 | Fails | Lc -39.2 | Non-text elements, placeholder text |
| Black text on #40CDF0 | 11.20:1 | AAA | Lc 68.8 | Content text, not long reading |
| #40CDF0 text on white | 1.87:1 | Fails | Lc 35.1 | Non-text elements, placeholder text |
| #40CDF0 text on black | 11.20:1 | AAA | Lc -67.5 | 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
#EAF8FD
oklch(97% 0.016 221.1)
-
Step 100
100
#D0F0FA
oklch(93.5% 0.036 218.6)
-
Step 200
200
#A4E5F8
oklch(88.5% 0.07 217.9)
-
Step 300
300 (this color)
#40CDF0
oklch(78.9% 0.126 218.4)
-
Step 400
400
#00B3D5
oklch(70.8% 0.127 217.9)
-
Step 500
500
#0099B7
oklch(63.1% 0.114 218.3)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#00596B
oklch(42.8% 0.077 217.7)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#40CDF0 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) | #B7C7F2 | 0.108 |
| Deuteranopia (no green cones) | #9FB6F0 | 0.096 |
| Tritanopia (no blue cones) | #00D9D8 | 0.057 |
| Achromatopsia (no color) | #BDBDBD | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40CDF0
#40CDF0
oklch(78.9% 0.126 218.4)
- #FF9D7D
#FF9D7D
oklch(78.9% 0.126 38.8)
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 #40CDF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.012
- Bright Sky Blue #02CCFE ΔE 0.025
- Aqua Blue #02D8E9 ΔE 0.037
- Lightblue #7BC8F6 ΔE 0.045
- Dark Turquoise #00CED1 ΔE 0.052
- Sky Blue #87CEEB ΔE 0.053
- Sky #82CAFC ΔE 0.054
- Deep Sky Blue #00BFFF ΔE 0.054
Use #40CDF0 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.