#509FE3
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.2% 0.127 247), rgb(80, 159, 227).
Aa
Black text reads best on this color (7.40:1).
About this color
#509FE3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.127 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.037 away. Black text reads best on it, at 7.40:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.40:1 |
| White text | 2.83:1 |
Values
| HEX | #509FE3 |
| RGB | rgb(80, 159, 227) |
| HSL | hsl(208, 72%, 60%) |
| OKLCH | oklch(68.2% 0.127 247) |
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 #509FE3 | 2.83:1 | Fails | Lc -59.4 | Large or bold text, headings |
| Black text on #509FE3 | 7.40:1 | AAA | Lc 49.9 | Large or bold text, headings |
| #509FE3 text on white | 2.83:1 | Fails | Lc 54.1 | Large or bold text, headings |
| #509FE3 text on black | 7.40:1 | AAA | Lc -47.7 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C2DDF5
oklch(88.5% 0.044 245.1)
-
Step 300
300
#97C6F2
oklch(80.9% 0.08 247.2)
-
Step 400
400 (this color)
#509FE3
oklch(68.2% 0.127 247)
-
Step 500
500
#0C8FE5
oklch(63.2% 0.162 246.7)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#004473
oklch(37.7% 0.1 247.4)
-
Step 950
950
#032845
oklch(26.9% 0.067 247.3)
#509FE3 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) | #81A1E6 | 0.051 |
| Deuteranopia (no green cones) | #6D93E2 | 0.039 |
| Tritanopia (no blue cones) | #00AFB7 | 0.097 |
| Achromatopsia (no color) | #999999 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FE3
#509FE3
oklch(68.2% 0.127 247)
- #CD8835
#CD8835
oklch(68.3% 0.128 67.2)
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 #509FE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.037
- Cornflower Blue #6495ED ΔE 0.037
- Dark Sky Blue #448EE4 ΔE 0.050
- Soft Blue #6488EA ΔE 0.065
- Faded Blue #658CBB ΔE 0.069
- Dodger Blue #1E90FF ΔE 0.072
- Greyblue #77A1B5 ΔE 0.078
- Periwinkle Blue #8F99FB ΔE 0.081
Use #509FE3 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.