#18B8F5
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.6% 0.146 232), rgb(24, 184, 245).
Aa
Black text reads best on this color (9.21:1).
About this color
#18B8F5 is a medium-light, vivid blue. In OKLCH its lightness is 74%, its chroma 0.146 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.021 away. Black text reads best on it, at 9.21:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.21:1 |
| White text | 2.27:1 |
Values
| HEX | #18B8F5 |
| RGB | rgb(24, 184, 245) |
| HSL | hsl(197, 92%, 53%) |
| OKLCH | oklch(73.6% 0.146 232) |
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 #18B8F5 | 2.27:1 | Fails | Lc -49.2 | Large or bold text, headings |
| Black text on #18B8F5 | 9.21:1 | AAA | Lc 59.6 | Large or bold text, headings |
| #18B8F5 text on white | 2.27:1 | Fails | Lc 44.3 | Non-text elements, placeholder text |
| #18B8F5 text on black | 9.21:1 | AAA | Lc -57.8 | 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
#EEF7FC
oklch(97.1% 0.012 231.7)
-
Step 100
100
#D9EDF9
oklch(93.5% 0.027 234)
-
Step 200
200
#B8E0F5
oklch(88.5% 0.051 230.9)
-
Step 300
300
#81CBF2
oklch(80.8% 0.092 232.5)
-
Step 400
400 (this color)
#18B8F5
oklch(73.6% 0.146 232)
-
Step 500
500
#0096C9
oklch(63.2% 0.128 231.5)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#004863
oklch(37.7% 0.077 231.8)
-
Step 950
950
#002B3D
oklch(27.1% 0.055 231.9)
#18B8F5 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) | #99B6F8 | 0.095 |
| Deuteranopia (no green cones) | #7EA3F4 | 0.080 |
| Tritanopia (no blue cones) | #00C8CD | 0.085 |
| Achromatopsia (no color) | #ACACAC | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18B8F5
#18B8F5
oklch(73.6% 0.146 232)
- #F08C4A
#F08C4A
oklch(73.5% 0.146 51.9)
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 #18B8F5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.021
- Bright Sky Blue #02CCFE ΔE 0.054
- Vivid Sky Blue #4CC9F0 ΔE 0.057
- Turquoise Blue #06B1C4 ΔE 0.072
- Lightblue #7BC8F6 ΔE 0.079
- Carolina Blue #8AB8FE ΔE 0.080
- Sky #82CAFC ΔE 0.089
- Chefchaouen Blue #4895EF ΔE 0.093
Use #18B8F5 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.