#40DDD5
Closest named color: Turquoise (#40E0D0). oklch(81.7% 0.127 189.9), rgb(64, 221, 213).
Aa
Black text reads best on this color (12.52:1).
About this color
#40DDD5 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.127 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.013 away. Black text reads best on it, at 12.52:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 12.52:1 |
| White text | 1.67:1 |
Values
| HEX | #40DDD5 |
| RGB | rgb(64, 221, 213) |
| HSL | hsl(177, 70%, 56%) |
| OKLCH | oklch(81.7% 0.127 189.9) |
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 #40DDD5 | 1.67:1 | Fails | Lc -32.9 | Non-text elements, placeholder text |
| Black text on #40DDD5 | 12.52:1 | AAA | Lc 74.6 | Content text, not long reading |
| #40DDD5 text on white | 1.67:1 | Fails | Lc 29.2 | Dividers and decoration only |
| #40DDD5 text on black | 12.52:1 | AAA | Lc -73.6 | 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
#E9F9F8
oklch(97% 0.017 192.4)
-
Step 100
100
#CFF2EF
oklch(93.5% 0.037 190.2)
-
Step 200
200
#A2E9E3
oklch(88.6% 0.071 189.3)
-
Step 300
300 (this color)
#40DDD5
oklch(81.7% 0.127 189.9)
-
Step 400
400
#00B8B1
oklch(70.6% 0.122 190)
-
Step 500
500
#009E98
oklch(63.1% 0.109 190)
-
Step 600
600
#008580
oklch(55.7% 0.096 190.1)
-
Step 700
700
#00706B
oklch(49.2% 0.085 189.4)
-
Step 800
800
#005C58
oklch(42.8% 0.074 189.6)
-
Step 900
900
#004C49
oklch(37.6% 0.065 190.2)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#40DDD5 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) | #D0D1D5 | 0.134 |
| Deuteranopia (no green cones) | #BAC1D6 | 0.126 |
| Tritanopia (no blue cones) | #00E3DA | 0.018 |
| Achromatopsia (no color) | #C8C8C8 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40DDD5
#40DDD5
oklch(81.7% 0.127 189.9)
- #FFA6B3
#FFA6B3
oklch(81.6% 0.106 10.1)
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 #40DDD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.013
- Medium Turquoise #48D1CC ΔE 0.032
- Aqua Blue #02D8E9 ΔE 0.038
- Dark Turquoise #00CED1 ΔE 0.048
- Seafoam Blue #78D1B6 ΔE 0.050
- Aqua Marine #2EE8BB ΔE 0.056
- Medium Aquamarine #66CDAA ΔE 0.061
- Pale Teal #82CBB2 ΔE 0.064
Use #40DDD5 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.