#519BE9
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.7% 0.138 251.6), rgb(81, 155, 233).
Aa
Black text reads best on this color (7.21:1).
About this color
#519BE9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.138 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.022 away. Black text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.21:1 |
| White text | 2.91:1 |
Values
| HEX | #519BE9 |
| RGB | rgb(81, 155, 233) |
| HSL | hsl(211, 78%, 62%) |
| OKLCH | oklch(67.7% 0.138 251.6) |
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 #519BE9 | 2.91:1 | Fails | Lc -60.5 | Content text, not long reading |
| Black text on #519BE9 | 7.21:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #519BE9 text on white | 2.91:1 | Fails | Lc 55.2 | Large or bold text, headings |
| #519BE9 text on black | 7.21:1 | AAA | Lc -46.6 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C3DCF9
oklch(88.5% 0.048 252.2)
-
Step 300
300
#98C5F7
oklch(81% 0.086 251.5)
-
Step 400
400 (this color)
#519BE9
oklch(67.7% 0.138 251.6)
-
Step 500
500
#1C8BEF
oklch(63.1% 0.176 251.7)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#00427A
oklch(37.7% 0.112 251.7)
-
Step 950
950
#052748
oklch(27% 0.072 251.7)
#519BE9 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) | #799FEC | 0.044 |
| Deuteranopia (no green cones) | #6491E7 | 0.029 |
| Tritanopia (no blue cones) | #00ADB7 | 0.108 |
| Achromatopsia (no color) | #979797 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #519BE9
#519BE9
oklch(67.7% 0.138 251.6)
- #CB871C
#CB871C
oklch(67.7% 0.138 71.6)
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 #519BE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.022
- Cornflower Blue #6495ED ΔE 0.024
- Dark Sky Blue #448EE4 ΔE 0.038
- Soft Blue #6488EA ΔE 0.051
- Dodger Blue #1E90FF ΔE 0.058
- Faded Blue #658CBB ΔE 0.072
- Periwinkle Blue #8F99FB ΔE 0.075
- Perrywinkle #8F8CE7 ΔE 0.075
Use #519BE9 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.