#18B4DB
Closest named color: Turquoise Blue (#06B1C4). oklch(71.4% 0.128 221.4), rgb(24, 180, 219).
Aa
Black text reads best on this color (8.59:1).
About this color
#18B4DB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.128 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.034 away. Black text reads best on it, at 8.59:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.59:1 |
| White text | 2.44:1 |
Values
| HEX | #18B4DB |
| RGB | rgb(24, 180, 219) |
| HSL | hsl(192, 80%, 48%) |
| OKLCH | oklch(71.4% 0.128 221.4) |
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 #18B4DB | 2.44:1 | Fails | Lc -52.5 | Large or bold text, headings |
| Black text on #18B4DB | 8.59:1 | AAA | Lc 56.5 | Large or bold text, headings |
| #18B4DB text on white | 2.44:1 | Fails | Lc 47.5 | Large or bold text, headings |
| #18B4DB text on black | 8.59:1 | AAA | Lc -54.5 | Large or bold text, headings |
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
#EEF7FB
oklch(97.1% 0.011 226)
-
Step 100
100
#DAEEF5
oklch(93.6% 0.023 220.7)
-
Step 200
200
#BAE0EE
oklch(88.4% 0.044 222.2)
-
Step 300
300
#85CDE5
oklch(80.9% 0.079 221.1)
-
Step 400
400 (this color)
#18B4DB
oklch(71.4% 0.128 221.4)
-
Step 500
500
#0098BB
oklch(63% 0.116 221.8)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C85
oklch(49.2% 0.09 221.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#00495C
oklch(37.6% 0.07 222.6)
-
Step 950
950
#002C38
oklch(27.2% 0.05 221.4)
#18B4DB 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) | #9DAFDD | 0.104 |
| Deuteranopia (no green cones) | #859EDB | 0.092 |
| Tritanopia (no blue cones) | #00C0C1 | 0.059 |
| Achromatopsia (no color) | #A6A6A6 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18B4DB
#18B4DB
oklch(71.4% 0.128 221.4)
- #E58662
#E58662
oklch(71.4% 0.127 41.3)
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 #18B4DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.034
- Deep Sky Blue #00BFFF ΔE 0.055
- Vivid Sky Blue #4CC9F0 ΔE 0.068
- Light Sea Green #20B2AA ΔE 0.073
- Bright Sky Blue #02CCFE ΔE 0.074
- Topaz #13BBAF ΔE 0.075
- Greyblue #77A1B5 ΔE 0.080
- Dark Turquoise #00CED1 ΔE 0.080
Use #18B4DB 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.