#18E4DD
Closest named color: Turquoise (#40E0D0). oklch(83.1% 0.141 190.8), rgb(24, 228, 221).
Aa
Black text reads best on this color (13.18:1).
About this color
#18E4DD is a light, vivid teal or cyan. In OKLCH its lightness is 83%, its chroma 0.141 and its hue 191°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.019 away. Black text reads best on it, at 13.18:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 13.18:1 |
| White text | 1.59:1 |
Values
| HEX | #18E4DD |
| RGB | rgb(24, 228, 221) |
| HSL | hsl(178, 81%, 49%) |
| OKLCH | oklch(83.1% 0.141 190.8) |
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 #18E4DD | 1.59:1 | Fails | Lc -29.6 | Dividers and decoration only |
| Black text on #18E4DD | 13.18:1 | AAA | Lc 77.6 | Fine for body text |
| #18E4DD text on white | 1.59:1 | Fails | Lc 26.2 | Dividers and decoration only |
| #18E4DD text on black | 13.18:1 | AAA | Lc -76.8 | 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 300.
-
Step 50
50
#E8FAF8
oklch(97.1% 0.019 188.8)
-
Step 100
100
#CCF3F0
oklch(93.6% 0.04 190.8)
-
Step 200
200
#9BEAE5
oklch(88.5% 0.078 190.8)
-
Step 300
300 (this color)
#18E4DD
oklch(83.1% 0.141 190.8)
-
Step 400
400
#00B8B2
oklch(70.6% 0.122 190.6)
-
Step 500
500
#009E99
oklch(63.1% 0.109 190.8)
-
Step 600
600
#008580
oklch(55.7% 0.096 190.1)
-
Step 700
700
#00706C
oklch(49.2% 0.085 190.4)
-
Step 800
800
#005B58
oklch(42.5% 0.073 190.9)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#18E4DD 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) | #D6D7DD | 0.149 |
| Deuteranopia (no green cones) | #BDC5DE | 0.140 |
| Tritanopia (no blue cones) | #00EBE1 | 0.018 |
| Achromatopsia (no color) | #CDCDCD | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18E4DD
#18E4DD
oklch(83.1% 0.141 190.8)
- #FFAEB8
#FFAEB8
oklch(83.1% 0.096 11.2)
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 #18E4DD, closest first.
No curated palette has a color within ΔE 0.04 of #18E4DD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.019
- Aqua Blue #02D8E9 ΔE 0.043
- Medium Turquoise #48D1CC ΔE 0.050
- Aqua Marine #2EE8BB ΔE 0.052
- Bright Aqua #0BF9EA ΔE 0.056
- Bright Light Blue #26F7FD ΔE 0.060
- Dark Turquoise #00CED1 ΔE 0.061
- Robin's Egg #6DEDFD ΔE 0.065
Use #18E4DD 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.