#40C3DC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.7% 0.116 213.2), rgb(64, 195, 220).
Aa
Black text reads best on this color (10.05:1).
About this color
#40C3DC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.116 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.032 away. Black text reads best on it, at 10.05:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.05:1 |
| White text | 2.08:1 |
Values
| HEX | #40C3DC |
| RGB | rgb(64, 195, 220) |
| HSL | hsl(190, 69%, 56%) |
| OKLCH | oklch(75.7% 0.116 213.2) |
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 #40C3DC | 2.08:1 | Fails | Lc -45.0 | Large or bold text, headings |
| Black text on #40C3DC | 10.05:1 | AAA | Lc 63.5 | Content text, not long reading |
| #40C3DC text on white | 2.08:1 | Fails | Lc 40.5 | Non-text elements, placeholder text |
| #40C3DC text on black | 10.05:1 | AAA | Lc -61.8 | 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 400.
-
Step 50
50
#EFF7F9
oklch(97.1% 0.009 214.3)
-
Step 100
100
#DBEEF2
oklch(93.6% 0.021 211.8)
-
Step 200
200
#BCE1E9
oklch(88.6% 0.04 212.2)
-
Step 300
300
#89CDDD
oklch(80.9% 0.072 214.1)
-
Step 400
400 (this color)
#40C3DC
oklch(75.7% 0.116 213.2)
-
Step 500
500
#009AB1
oklch(63% 0.11 213.1)
-
Step 600
600
#008295
oklch(55.7% 0.097 212.5)
-
Step 700
700
#006D7E
oklch(49.1% 0.086 213.3)
-
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)
#40C3DC 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) | #B0BDDD | 0.105 |
| Deuteranopia (no green cones) | #9AADDC | 0.094 |
| Tritanopia (no blue cones) | #00CDCB | 0.046 |
| Achromatopsia (no color) | #B3B3B3 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40C3DC
#40C3DC
oklch(75.7% 0.116 213.2)
- #F09480
#F09480
oklch(75.7% 0.116 33)
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 #40C3DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.032
- Dark Turquoise #00CED1 ΔE 0.041
- Bright Sky Blue #02CCFE ΔE 0.048
- Medium Turquoise #48D1CC ΔE 0.053
- Aqua Blue #02D8E9 ΔE 0.055
- Deep Sky Blue #00BFFF ΔE 0.057
- Turquoise Blue #06B1C4 ΔE 0.062
- Lightblue #7BC8F6 ΔE 0.063
Use #40C3DC 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.