#40E9EE
Closest named color: Robin's Egg (#6DEDFD). oklch(85.4% 0.132 198), rgb(64, 233, 238).
Aa
Black text reads best on this color (14.10:1).
About this color
#40E9EE is a light, moderately saturated teal or cyan. In OKLCH its lightness is 85%, its chroma 0.132 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.036 away. Black text reads best on it, at 14.10:1.
| Hue family | Teals and cyans |
| Lightness | light (85%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 14.10:1 |
| White text | 1.48:1 |
Values
| HEX | #40E9EE |
| RGB | rgb(64, 233, 238) |
| HSL | hsl(182, 84%, 59%) |
| OKLCH | oklch(85.4% 0.132 198) |
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 #40E9EE | 1.48:1 | Fails | Lc -25.6 | Dividers and decoration only |
| Black text on #40E9EE | 14.10:1 | AAA | Lc 81.2 | Fine for body text |
| #40E9EE text on white | 1.48:1 | Fails | Lc 22.5 | Dividers and decoration only |
| #40E9EE text on black | 14.10:1 | AAA | Lc -80.7 | Fine for body text |
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 200.
-
Step 50
50
#E5FBFB
oklch(97.2% 0.023 196.8)
-
Step 100
100
#C4F5F6
oklch(93.7% 0.05 197.9)
-
Step 200
200 (this color)
#40E9EE
oklch(85.4% 0.132 198)
-
Step 300
300
#00DBE0
oklch(80.9% 0.138 197.7)
-
Step 400
400
#00B7BB
oklch(70.7% 0.12 197.6)
-
Step 500
500
#009DA1
oklch(63.2% 0.107 198)
-
Step 600
600
#008487
oklch(55.6% 0.095 197.6)
-
Step 700
700
#006F72
oklch(49.2% 0.084 198.1)
-
Step 800
800
#005B5D
oklch(42.7% 0.073 197.4)
-
Step 900
900
#004C4E
oklch(37.8% 0.064 197.8)
-
Step 950
950
#002D2E
oklch(27% 0.046 197.1)
#40E9EE 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) | #D9DEEF | 0.137 |
| Deuteranopia (no green cones) | #C0CCEF | 0.127 |
| Tritanopia (no blue cones) | #00F1EA | 0.026 |
| Achromatopsia (no color) | #D4D4D4 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40E9EE
#40E9EE
oklch(85.4% 0.132 198)
- #FFBABB
#FFBABB
oklch(85.3% 0.08 17.9)
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 #40E9EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.036
- Bright Light Blue #26F7FD ΔE 0.037
- Turquoise #40E0D0 ΔE 0.043
- Bright Aqua #0BF9EA ΔE 0.046
- Aqua Blue #02D8E9 ΔE 0.051
- Bright Cyan #41FDFE ΔE 0.054
- Bright Turquoise #0FFEF9 ΔE 0.054
- Cyan #00FFFF ΔE 0.057
Use #40E9EE 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.