#18ADEF
Closest named color: Deep Sky Blue (#00BFFF). oklch(70.7% 0.147 235.7), rgb(24, 173, 239).
Aa
Black text reads best on this color (8.26:1).
About this color
#18ADEF is a medium-light, vivid blue. In OKLCH its lightness is 71%, its chroma 0.147 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.050 away. Black text reads best on it, at 8.26:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.26:1 |
| White text | 2.54:1 |
Values
| HEX | #18ADEF |
| RGB | rgb(24, 173, 239) |
| HSL | hsl(198, 87%, 52%) |
| OKLCH | oklch(70.7% 0.147 235.7) |
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 #18ADEF | 2.54:1 | Fails | Lc -54.3 | Large or bold text, headings |
| Black text on #18ADEF | 8.26:1 | AAA | Lc 54.8 | Large or bold text, headings |
| #18ADEF text on white | 2.54:1 | Fails | Lc 49.2 | Large or bold text, headings |
| #18ADEF text on black | 8.26:1 | AAA | Lc -52.7 | 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
#EEF7FD
oklch(97.1% 0.013 236.6)
-
Step 100
100
#DAEDFA
oklch(93.6% 0.027 237.6)
-
Step 200
200
#BADFF7
oklch(88.5% 0.051 236.6)
-
Step 300
300
#84CAF4
oklch(80.8% 0.092 235.9)
-
Step 400
400 (this color)
#18ADEF
oklch(70.7% 0.147 235.7)
-
Step 500
500
#0094CF
oklch(63% 0.135 235.8)
-
Step 600
600
#007DAF
oklch(55.7% 0.119 235.4)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#18ADEF 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) | #8DADF2 | 0.087 |
| Deuteranopia (no green cones) | #719AEE | 0.070 |
| Tritanopia (no blue cones) | #00BEC4 | 0.091 |
| Achromatopsia (no color) | #A2A2A2 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18ADEF
#18ADEF
oklch(70.7% 0.147 235.7)
- #E58538
#E58538
oklch(70.8% 0.147 55.6)
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 #18ADEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.050
- Chefchaouen Blue #4895EF ΔE 0.065
- Turquoise Blue #06B1C4 ΔE 0.070
- Cornflower Blue #6495ED ΔE 0.072
- Dark Sky Blue #448EE4 ΔE 0.082
- Bright Sky Blue #02CCFE ΔE 0.084
- Vivid Sky Blue #4CC9F0 ΔE 0.085
- Dodger Blue #1E90FF ΔE 0.086
Use #18ADEF 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.