#18C4E1
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.5% 0.129 213.7), rgb(24, 196, 225).
Aa
Black text reads best on this color (10.02:1).
About this color
#18C4E1 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.129 and its hue 214°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.034 away. Black text reads best on it, at 10.02:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.02:1 |
| White text | 2.09:1 |
Values
| HEX | #18C4E1 |
| RGB | rgb(24, 196, 225) |
| HSL | hsl(189, 81%, 49%) |
| OKLCH | oklch(75.5% 0.129 213.7) |
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 #18C4E1 | 2.09:1 | Fails | Lc -45.0 | Non-text elements, placeholder text |
| Black text on #18C4E1 | 10.02:1 | AAA | Lc 63.5 | Content text, not long reading |
| #18C4E1 text on white | 2.09:1 | Fails | Lc 40.4 | Non-text elements, placeholder text |
| #18C4E1 text on black | 10.02:1 | AAA | Lc -61.9 | 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 400.
-
Step 50
50
#EEF7FA
oklch(97% 0.01 219.6)
-
Step 100
100
#D9EEF3
oklch(93.5% 0.023 213.6)
-
Step 200
200
#B8E1EB
oklch(88.4% 0.045 214.2)
-
Step 300
300
#80CFE0
oklch(81% 0.081 212.9)
-
Step 400
400 (this color)
#18C4E1
oklch(75.5% 0.129 213.7)
-
Step 500
500
#009AB2
oklch(63.1% 0.111 213.9)
-
Step 600
600
#008196
oklch(55.5% 0.098 214.4)
-
Step 700
700
#006D7E
oklch(49.1% 0.086 213.3)
-
Step 800
800
#005968
oklch(42.7% 0.075 214.2)
-
Step 900
900
#004A57
oklch(37.6% 0.066 214.5)
-
Step 950
950
#002C34
oklch(26.9% 0.047 213.2)
#18C4E1 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) | #AFBDE3 | 0.117 |
| Deuteranopia (no green cones) | #96ABE1 | 0.106 |
| Tritanopia (no blue cones) | #00CFCD | 0.049 |
| Achromatopsia (no color) | #B3B3B3 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18C4E1
#18C4E1
oklch(75.5% 0.129 213.7)
- #F68F78
#F68F78
oklch(75.4% 0.13 33.5)
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 #18C4E1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.034
- Dark Turquoise #00CED1 ΔE 0.042
- Bright Sky Blue #02CCFE ΔE 0.042
- Deep Sky Blue #00BFFF ΔE 0.050
- Aqua Blue #02D8E9 ΔE 0.054
- Medium Turquoise #48D1CC ΔE 0.058
- Turquoise Blue #06B1C4 ΔE 0.061
- Lightblue #7BC8F6 ΔE 0.070
Use #18C4E1 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.