#509EE3
Closest named color: Chefchaouen Blue (#4895EF). oklch(68% 0.128 247.6), rgb(80, 158, 227).
Aa
Black text reads best on this color (7.34:1).
About this color
#509EE3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.128 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.035 away. Black text reads best on it, at 7.34:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.34:1 |
| White text | 2.86:1 |
Values
| HEX | #509EE3 |
| RGB | rgb(80, 158, 227) |
| HSL | hsl(208, 72%, 60%) |
| OKLCH | oklch(68% 0.128 247.6) |
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 #509EE3 | 2.86:1 | Fails | Lc -59.8 | Large or bold text, headings |
| Black text on #509EE3 | 7.34:1 | AAA | Lc 49.5 | Large or bold text, headings |
| #509EE3 text on white | 2.86:1 | Fails | Lc 54.5 | Large or bold text, headings |
| #509EE3 text on black | 7.34:1 | AAA | Lc -47.3 | 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
#C3DDF6
oklch(88.6% 0.044 247.3)
-
Step 300
300
#97C6F2
oklch(80.9% 0.08 247.2)
-
Step 400
400 (this color)
#509EE3
oklch(68% 0.128 247.6)
-
Step 500
500
#118EE6
oklch(63% 0.164 247.7)
-
Step 600
600
#0077C5
oklch(55.6% 0.149 247.9)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900
#004474
oklch(37.7% 0.101 247.8)
-
Step 950
950
#032845
oklch(26.9% 0.067 247.3)
#509EE3 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) | #80A1E6 | 0.051 |
| Deuteranopia (no green cones) | #6C92E2 | 0.039 |
| Tritanopia (no blue cones) | #00AEB6 | 0.098 |
| Achromatopsia (no color) | #999999 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509EE3
#509EE3
oklch(68% 0.128 247.6)
- #CC8733
#CC8733
oklch(68% 0.128 67.3)
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 #509EE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.035
- Cornflower Blue #6495ED ΔE 0.035
- Dark Sky Blue #448EE4 ΔE 0.047
- Soft Blue #6488EA ΔE 0.063
- Faded Blue #658CBB ΔE 0.068
- Dodger Blue #1E90FF ΔE 0.070
- Greyblue #77A1B5 ΔE 0.079
- Periwinkle Blue #8F99FB ΔE 0.080
Use #509EE3 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.