#19B4FD
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.1% 0.156 237.4), rgb(25, 180, 253).
Aa
Black text reads best on this color (8.98:1).
About this color
#19B4FD is a medium-light, vivid blue. In OKLCH its lightness is 73%, its chroma 0.156 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.029 away. Black text reads best on it, at 8.98:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.98:1 |
| White text | 2.33:1 |
Values
| HEX | #19B4FD |
| RGB | rgb(25, 180, 253) |
| HSL | hsl(199, 98%, 55%) |
| OKLCH | oklch(73.1% 0.156 237.4) |
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 #19B4FD | 2.33:1 | Fails | Lc -50.4 | Large or bold text, headings |
| Black text on #19B4FD | 8.98:1 | AAA | Lc 58.5 | Large or bold text, headings |
| #19B4FD text on white | 2.33:1 | Fails | Lc 45.5 | Large or bold text, headings |
| #19B4FD text on black | 8.98:1 | AAA | Lc -56.6 | 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
#EEF7FD
oklch(97.1% 0.013 236.6)
-
Step 100
100
#D9EDFB
oklch(93.6% 0.028 238.2)
-
Step 200
200
#B8DFF9
oklch(88.4% 0.054 237.4)
-
Step 300
300
#82CAF8
oklch(80.9% 0.097 237.7)
-
Step 400
400 (this color)
#19B4FD
oklch(73.1% 0.156 237.4)
-
Step 500
500
#0094D2
oklch(63.2% 0.138 237.1)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#002A40
oklch(27% 0.06 237.8)
#19B4FD 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) | #90B4FF | 0.086 |
| Deuteranopia (no green cones) | #73A1FC | 0.069 |
| Tritanopia (no blue cones) | #00C7CE | 0.099 |
| Achromatopsia (no color) | #AAAAAA | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #19B4FD
#19B4FD
oklch(73.1% 0.156 237.4)
- #EF8B32
#EF8B32
oklch(73% 0.156 57.4)
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 #19B4FD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.029
- Bright Sky Blue #02CCFE ΔE 0.066
- Vivid Sky Blue #4CC9F0 ΔE 0.072
- Carolina Blue #8AB8FE ΔE 0.080
- Chefchaouen Blue #4895EF ΔE 0.081
- Cornflower Blue #6495ED ΔE 0.084
- Turquoise Blue #06B1C4 ΔE 0.085
- Lightblue #7BC8F6 ΔE 0.089
Use #19B4FD 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.