#18BBDD
Closest named color: Turquoise Blue (#06B1C4). oklch(73.2% 0.128 217.6), rgb(24, 187, 221).
Aa
Black text reads best on this color (9.19:1).
About this color
#18BBDD is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.128 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.042 away. Black text reads best on it, at 9.19:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 9.19:1 |
| White text | 2.28:1 |
Values
| HEX | #18BBDD |
| RGB | rgb(24, 187, 221) |
| HSL | hsl(190, 80%, 48%) |
| OKLCH | oklch(73.2% 0.128 217.6) |
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 #18BBDD | 2.28:1 | Fails | Lc -49.3 | Large or bold text, headings |
| Black text on #18BBDD | 9.19:1 | AAA | Lc 59.5 | Large or bold text, headings |
| #18BBDD text on white | 2.28:1 | Fails | Lc 44.5 | Non-text elements, placeholder text |
| #18BBDD text on black | 9.19:1 | AAA | Lc -57.6 | 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
#EEF7FA
oklch(97% 0.01 219.6)
-
Step 100
100
#DAEEF4
oklch(93.6% 0.023 217.6)
-
Step 200
200
#B9E1ED
oklch(88.5% 0.045 217.9)
-
Step 300
300
#83CEE3
oklch(81% 0.08 217.5)
-
Step 400
400 (this color)
#18BBDD
oklch(73.2% 0.128 217.6)
-
Step 500
500
#0099B6
oklch(63% 0.113 217.6)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
Step 700
700
#006C81
oklch(49% 0.088 217.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#18BBDD 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) | #A5B5DF | 0.110 |
| Deuteranopia (no green cones) | #8DA4DD | 0.098 |
| Tritanopia (no blue cones) | #00C7C6 | 0.055 |
| Achromatopsia (no color) | #ABABAB | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18BBDD
#18BBDD
oklch(73.2% 0.128 217.6)
- #EC8A6C
#EC8A6C
oklch(73.1% 0.127 37.8)
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 #18BBDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.042
- Deep Sky Blue #00BFFF ΔE 0.049
- Vivid Sky Blue #4CC9F0 ΔE 0.052
- Bright Sky Blue #02CCFE ΔE 0.059
- Dark Turquoise #00CED1 ΔE 0.062
- Topaz #13BBAF ΔE 0.069
- Light Sea Green #20B2AA ΔE 0.074
- Medium Turquoise #48D1CC ΔE 0.078
Use #18BBDD 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.