#40D9DC
Closest named color: Aqua Blue (#02D8E9). oklch(80.9% 0.124 197), rgb(64, 217, 220).
Aa
Black text reads best on this color (12.17:1).
About this color
#40D9DC is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.124 and its hue 197°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.023 away. Black text reads best on it, at 12.17:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.17:1 |
| White text | 1.72:1 |
Values
| HEX | #40D9DC |
| RGB | rgb(64, 217, 220) |
| HSL | hsl(181, 69%, 56%) |
| OKLCH | oklch(80.9% 0.124 197) |
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 #40D9DC | 1.72:1 | Fails | Lc -34.6 | Non-text elements, placeholder text |
| Black text on #40D9DC | 12.17:1 | AAA | Lc 73.1 | Content text, not long reading |
| #40D9DC text on white | 1.72:1 | Fails | Lc 30.7 | Non-text elements, placeholder text |
| #40D9DC text on black | 12.17:1 | AAA | Lc -72.0 | 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
#E9F9F9
oklch(97% 0.017 196.9)
-
Step 100
100
#CFF2F2
oklch(93.6% 0.036 196.5)
-
Step 200
200
#A3E8E9
oklch(88.6% 0.069 197.1)
-
Step 300
300 (this color)
#40D9DC
oklch(80.9% 0.124 197)
-
Step 400
400
#00B7BA
oklch(70.7% 0.12 196.9)
-
Step 500
500
#009DA0
oklch(63.1% 0.107 197.2)
-
Step 600
600
#008486
oklch(55.6% 0.095 196.7)
-
Step 700
700
#006F71
oklch(49.1% 0.084 197)
-
Step 800
800
#005B5D
oklch(42.7% 0.073 197.4)
-
Step 900
900
#004C4D
oklch(37.8% 0.064 196.3)
-
Step 950
950
#002D2E
oklch(27% 0.046 197.1)
#40D9DC 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) | #CACFDC | 0.127 |
| Deuteranopia (no green cones) | #B3BEDD | 0.119 |
| Tritanopia (no blue cones) | #00E0D9 | 0.024 |
| Achromatopsia (no color) | #C5C5C5 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40D9DC
#40D9DC
oklch(80.9% 0.124 197)
- #FFA4A8
#FFA4A8
oklch(81% 0.108 16.9)
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 #40D9DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.023
- Medium Turquoise #48D1CC ΔE 0.026
- Turquoise #40E0D0 ΔE 0.030
- Dark Turquoise #00CED1 ΔE 0.038
- Seafoam Blue #78D1B6 ΔE 0.056
- Vivid Sky Blue #4CC9F0 ΔE 0.061
- Sky Blue #87CEEB ΔE 0.065
- Pale Teal #82CBB2 ΔE 0.066
Use #40D9DC 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.