#40CFDB
Closest named color: Dark Turquoise (#00CED1). oklch(78.5% 0.119 203.3), rgb(64, 207, 219).
Aa
Black text reads best on this color (11.16:1).
About this color
#40CFDB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 79%, its chroma 0.119 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Turquoise (#00CED1), ΔE 0.024 away. Black text reads best on it, at 11.16:1.
| Hue family | Teals and cyans |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Dark Turquoise (#00CED1) |
| Black text | 11.16:1 |
| White text | 1.88:1 |
Values
| HEX | #40CFDB |
| RGB | rgb(64, 207, 219) |
| HSL | hsl(185, 68%, 55%) |
| OKLCH | oklch(78.5% 0.119 203.3) |
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 #40CFDB | 1.88:1 | Fails | Lc -39.5 | Non-text elements, placeholder text |
| Black text on #40CFDB | 11.16:1 | AAA | Lc 68.6 | Content text, not long reading |
| #40CFDB text on white | 1.88:1 | Fails | Lc 35.3 | Non-text elements, placeholder text |
| #40CFDB text on black | 11.16:1 | AAA | Lc -67.3 | 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
#EAF9FA
oklch(97.1% 0.016 201.7)
-
Step 100
100
#D0F1F4
oklch(93.5% 0.035 203.3)
-
Step 200
200
#A5E7ED
oklch(88.6% 0.067 203.1)
-
Step 300
300 (this color)
#40CFDB
oklch(78.5% 0.119 203.3)
-
Step 400
400
#00B6C2
oklch(70.7% 0.12 203.2)
-
Step 500
500
#009CA6
oklch(63.1% 0.107 202.8)
-
Step 600
600
#00838C
oklch(55.6% 0.095 203.3)
-
Step 700
700
#006E76
oklch(49.1% 0.084 203.6)
-
Step 800
800
#005A61
oklch(42.6% 0.073 204)
-
Step 900
900
#004B51
oklch(37.6% 0.064 204)
-
Step 950
950
#002D30
oklch(27% 0.046 201.8)
#40CFDB 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) | #BFC6DC | 0.119 |
| Deuteranopia (no green cones) | #A9B6DC | 0.110 |
| Tritanopia (no blue cones) | #00D7D2 | 0.032 |
| Achromatopsia (no color) | #BDBDBD | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40CFDB
#40CFDB
oklch(78.5% 0.119 203.3)
- #FC9A95
#FC9A95
oklch(78.6% 0.118 23.2)
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 #40CFDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Turquoise #00CED1 ΔE 0.024
- Medium Turquoise #48D1CC ΔE 0.024
- Aqua Blue #02D8E9 ΔE 0.027
- Vivid Sky Blue #4CC9F0 ΔE 0.040
- Bright Sky Blue #02CCFE ΔE 0.055
- Turquoise #40E0D0 ΔE 0.055
- Sky Blue #87CEEB ΔE 0.061
- Seafoam Blue #78D1B6 ΔE 0.063
Use #40CFDB 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.