#18CFEC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(78.6% 0.135 212.8), rgb(24, 207, 236).
Aa
Black text reads best on this color (11.17:1).
About this color
#18CFEC is a light, moderately saturated teal or cyan. In OKLCH its lightness is 79%, its chroma 0.135 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.026 away. Black text reads best on it, at 11.17:1.
| Hue family | Teals and cyans |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.17:1 |
| White text | 1.87:1 |
Values
| HEX | #18CFEC |
| RGB | rgb(24, 207, 236) |
| HSL | hsl(188, 85%, 51%) |
| OKLCH | oklch(78.6% 0.135 212.8) |
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 #18CFEC | 1.87:1 | Fails | Lc -39.2 | Non-text elements, placeholder text |
| Black text on #18CFEC | 11.17:1 | AAA | Lc 68.9 | Content text, not long reading |
| #18CFEC text on white | 1.87:1 | Fails | Lc 35.0 | Non-text elements, placeholder text |
| #18CFEC text on black | 11.17:1 | AAA | Lc -67.5 | 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
#E9F9FD
oklch(97.1% 0.018 214.4)
-
Step 100
100
#CDF1F9
oklch(93.5% 0.039 212.6)
-
Step 200
200
#9EE7F6
oklch(88.5% 0.075 211.9)
-
Step 300
300 (this color)
#18CFEC
oklch(78.6% 0.135 212.8)
-
Step 400
400
#00B4CE
oklch(70.7% 0.124 212.8)
-
Step 500
500
#009AB1
oklch(63% 0.11 213.1)
-
Step 600
600
#008295
oklch(55.7% 0.097 212.5)
-
Step 700
700
#006D7D
oklch(49.1% 0.086 212.3)
-
Step 800
800
#005967
oklch(42.6% 0.075 213)
-
Step 900
900
#004A56
oklch(37.6% 0.066 213)
-
Step 950
950
#002C34
oklch(26.9% 0.047 213.2)
#18CFEC 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) | #B9C8EE | 0.123 |
| Deuteranopia (no green cones) | #A0B5EC | 0.111 |
| Tritanopia (no blue cones) | #00DAD8 | 0.049 |
| Achromatopsia (no color) | #BDBDBD | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18CFEC
#18CFEC
oklch(78.6% 0.135 212.8)
- #FF9A85
#FF9A85
oklch(78.6% 0.126 32.6)
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 #18CFEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.026
- Aqua Blue #02D8E9 ΔE 0.027
- Bright Sky Blue #02CCFE ΔE 0.030
- Dark Turquoise #00CED1 ΔE 0.040
- Medium Turquoise #48D1CC ΔE 0.050
- Deep Sky Blue #00BFFF ΔE 0.059
- Lightblue #7BC8F6 ΔE 0.060
- Sky Blue #87CEEB ΔE 0.065
Use #18CFEC 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.