#18CDCA
Closest named color: Dark Turquoise (#00CED1). oklch(76.8% 0.129 192.9), rgb(24, 205, 202).
Aa
Black text reads best on this color (10.62:1).
About this color
#18CDCA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.129 and its hue 193°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Turquoise (#00CED1), ΔE 0.010 away. Black text reads best on it, at 10.62:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Turquoise (#00CED1) |
| Black text | 10.62:1 |
| White text | 1.97:1 |
Values
| HEX | #18CDCA |
| RGB | rgb(24, 205, 202) |
| HSL | hsl(179, 79%, 45%) |
| OKLCH | oklch(76.8% 0.129 192.9) |
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 #18CDCA | 1.97:1 | Fails | Lc -41.9 | Non-text elements, placeholder text |
| Black text on #18CDCA | 10.62:1 | AAA | Lc 66.3 | Content text, not long reading |
| #18CDCA text on white | 1.97:1 | Fails | Lc 37.6 | Non-text elements, placeholder text |
| #18CDCA text on black | 10.62:1 | AAA | Lc -64.8 | 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
#CEF2F1
oklch(93.5% 0.037 194.5)
-
Step 200
200
#A1E9E6
oklch(88.6% 0.072 192.6)
-
Step 300
300 (this color)
#18CDCA
oklch(76.8% 0.129 192.9)
-
Step 400
400
#00B8B5
oklch(70.8% 0.121 192.7)
-
Step 500
500
#009E9B
oklch(63.2% 0.108 192.4)
-
Step 600
600
#008482
oklch(55.5% 0.095 192.9)
-
Step 700
700
#006F6E
oklch(49% 0.084 193.7)
-
Step 800
800
#005B5A
oklch(42.6% 0.073 193.5)
-
Step 900
900
#004C4B
oklch(37.7% 0.064 193.2)
-
Step 950
950
#002D2D
oklch(26.9% 0.046 194.8)
#18CDCA 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) | #BFC2CA | 0.135 |
| Deuteranopia (no green cones) | #A8B1CB | 0.126 |
| Tritanopia (no blue cones) | #00D3CC | 0.016 |
| Achromatopsia (no color) | #B8B8B8 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18CDCA
#18CDCA
oklch(76.8% 0.129 192.9)
- #FA909C
#FA909C
oklch(76.9% 0.128 13.3)
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 #18CDCA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Turquoise #00CED1 ΔE 0.010
- Medium Turquoise #48D1CC ΔE 0.022
- Aqua Blue #02D8E9 ΔE 0.047
- Medium Aquamarine #66CDAA ΔE 0.054
- Topaz #13BBAF ΔE 0.056
- Turquoise #40E0D0 ΔE 0.057
- Seafoam Blue #78D1B6 ΔE 0.060
- Pale Teal #82CBB2 ΔE 0.064
Use #18CDCA 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.