#40CDC9
Closest named color: Medium Turquoise (#48D1CC). oklch(77.4% 0.117 192.2), rgb(64, 205, 201).
Aa
Black text reads best on this color (10.79:1).
About this color
#40CDC9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.117 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Turquoise (#48D1CC), ΔE 0.013 away. Black text reads best on it, at 10.79:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Medium Turquoise (#48D1CC) |
| Black text | 10.79:1 |
| White text | 1.94:1 |
Values
| HEX | #40CDC9 |
| RGB | rgb(64, 205, 201) |
| HSL | hsl(178, 59%, 53%) |
| OKLCH | oklch(77.4% 0.117 192.2) |
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 #40CDC9 | 1.94:1 | Fails | Lc -41.3 | Non-text elements, placeholder text |
| Black text on #40CDC9 | 10.79:1 | AAA | Lc 66.9 | Content text, not long reading |
| #40CDC9 text on white | 1.94:1 | Fails | Lc 37.0 | Non-text elements, placeholder text |
| #40CDC9 text on black | 10.79:1 | AAA | Lc -65.5 | 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
#EAF9F8
oklch(97.1% 0.016 192.1)
-
Step 100
100
#D1F2F0
oklch(93.7% 0.034 192.1)
-
Step 200
200
#A7E7E4
oklch(88.4% 0.065 192.4)
-
Step 300
300 (this color)
#40CDC9
oklch(77.4% 0.117 192.2)
-
Step 400
400
#00B8B4
oklch(70.7% 0.121 192)
-
Step 500
500
#009E9A
oklch(63.2% 0.109 191.6)
-
Step 600
600
#008582
oklch(55.7% 0.096 192)
-
Step 700
700
#006F6D
oklch(49% 0.084 192.6)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#40CDC9 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) | #C1C3C9 | 0.124 |
| Deuteranopia (no green cones) | #ACB3CA | 0.116 |
| Tritanopia (no blue cones) | #00D3CB | 0.020 |
| Achromatopsia (no color) | #BABABA | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40CDC9
#40CDC9
oklch(77.4% 0.117 192.2)
- #F695A1
#F695A1
oklch(77.3% 0.117 12.2)
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 #40CDC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Turquoise #48D1CC ΔE 0.013
- Dark Turquoise #00CED1 ΔE 0.017
- Aqua Blue #02D8E9 ΔE 0.046
- Medium Aquamarine #66CDAA ΔE 0.047
- Seafoam Blue #78D1B6 ΔE 0.049
- Turquoise #40E0D0 ΔE 0.052
- Pale Teal #82CBB2 ΔE 0.053
- Topaz #13BBAF ΔE 0.061
Use #40CDC9 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.