#509BE3
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.3% 0.131 249.5), rgb(80, 155, 227).
Aa
Black text reads best on this color (7.13:1).
About this color
#509BE3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.131 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.028 away. Black text reads best on it, at 7.13:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.13:1 |
| White text | 2.94:1 |
Values
| HEX | #509BE3 |
| RGB | rgb(80, 155, 227) |
| HSL | hsl(209, 72%, 60%) |
| OKLCH | oklch(67.3% 0.131 249.5) |
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 #509BE3 | 2.94:1 | Fails | Lc -61.0 | Content text, not long reading |
| Black text on #509BE3 | 7.13:1 | AAA | Lc 48.4 | Large or bold text, headings |
| #509BE3 text on white | 2.94:1 | Fails | Lc 55.6 | Large or bold text, headings |
| #509BE3 text on black | 7.13:1 | AAA | Lc -46.2 | 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
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C3DCF7
oklch(88.5% 0.046 250.4)
-
Step 300
300
#98C5F4
oklch(80.8% 0.082 250)
-
Step 400
400 (this color)
#509BE3
oklch(67.3% 0.131 249.5)
-
Step 500
500
#1B8DE9
oklch(63.1% 0.167 249.5)
-
Step 600
600
#0076C9
oklch(55.6% 0.155 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#004376
oklch(37.6% 0.105 249.5)
-
Step 950
950
#052846
oklch(27.1% 0.068 249.1)
#509BE3 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) | #7C9EE6 | 0.047 |
| Deuteranopia (no green cones) | #6790E2 | 0.034 |
| Tritanopia (no blue cones) | #00ACB5 | 0.101 |
| Achromatopsia (no color) | #969696 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509BE3
#509BE3
oklch(67.3% 0.131 249.5)
- #C9862A
#C9862A
oklch(67.3% 0.131 69.8)
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 #509BE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.028
- Cornflower Blue #6495ED ΔE 0.030
- Dark Sky Blue #448EE4 ΔE 0.039
- Soft Blue #6488EA ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.064
- Faded Blue #658CBB ΔE 0.064
- Water Blue #0E87CC ΔE 0.077
- Perrywinkle #8F8CE7 ΔE 0.078
Use #509BE3 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.