#18BDDF
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.8% 0.129 217.4), rgb(24, 189, 223).
Aa
Black text reads best on this color (9.38:1).
About this color
#18BDDF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.129 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.046 away. Black text reads best on it, at 9.38:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.38:1 |
| White text | 2.23:1 |
Values
| HEX | #18BDDF |
| RGB | rgb(24, 189, 223) |
| HSL | hsl(190, 81%, 48%) |
| OKLCH | oklch(73.8% 0.129 217.4) |
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 #18BDDF | 2.23:1 | Fails | Lc -48.3 | Large or bold text, headings |
| Black text on #18BDDF | 9.38:1 | AAA | Lc 60.4 | Content text, not long reading |
| #18BDDF text on white | 2.23:1 | Fails | Lc 43.5 | Non-text elements, placeholder text |
| #18BDDF text on black | 9.38:1 | AAA | Lc -58.6 | 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
#82CEE3
oklch(80.9% 0.081 217.3)
-
Step 400
400 (this color)
#18BDDF
oklch(73.8% 0.129 217.4)
-
Step 500
500
#0099B6
oklch(63% 0.113 217.6)
-
Step 600
600
#008199
oklch(55.6% 0.099 216.9)
-
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)
#18BDDF 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) | #A7B7E1 | 0.111 |
| Deuteranopia (no green cones) | #8FA6DF | 0.099 |
| Tritanopia (no blue cones) | #00C9C8 | 0.055 |
| Achromatopsia (no color) | #ADADAD | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18BDDF
#18BDDF
oklch(73.8% 0.129 217.4)
- #EF8B6E
#EF8B6E
oklch(73.7% 0.129 37)
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 #18BDDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.046
- Vivid Sky Blue #4CC9F0 ΔE 0.047
- Turquoise Blue #06B1C4 ΔE 0.047
- Bright Sky Blue #02CCFE ΔE 0.053
- Dark Turquoise #00CED1 ΔE 0.058
- Topaz #13BBAF ΔE 0.071
- Aqua Blue #02D8E9 ΔE 0.074
- Medium Turquoise #48D1CC ΔE 0.075
Use #18BDDF 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.