#509CD4
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.8% 0.113 242.9), rgb(80, 156, 212).
Aa
Black text reads best on this color (7.04:1).
About this color
#509CD4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.113 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.049 away. Black text reads best on it, at 7.04:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.04:1 |
| White text | 2.97:1 |
Values
| HEX | #509CD4 |
| RGB | rgb(80, 156, 212) |
| HSL | hsl(205, 61%, 57%) |
| OKLCH | oklch(66.8% 0.113 242.9) |
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 #509CD4 | 2.97:1 | Fails | Lc -61.5 | Content text, not long reading |
| Black text on #509CD4 | 7.04:1 | AAA | Lc 47.9 | Large or bold text, headings |
| #509CD4 text on white | 2.97:1 | Fails | Lc 56.2 | Large or bold text, headings |
| #509CD4 text on black | 7.04:1 | AAA | Lc -45.6 | 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 500.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A3C6E2
oklch(81% 0.055 242.5)
-
Step 400
400
#6EA7D3
oklch(70.6% 0.088 242.7)
-
Step 500
500 (this color)
#509CD4
oklch(66.8% 0.113 242.9)
-
Step 600
600
#1E7AB5
oklch(55.7% 0.123 242.9)
-
Step 700
700
#0D669B
oklch(49% 0.113 242.9)
-
Step 800
800
#11547E
oklch(42.8% 0.094 242.5)
-
Step 900
900
#184565
oklch(37.6% 0.073 243.3)
-
Step 950
950
#10293B
oklch(27.1% 0.046 242.4)
#509CD4 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) | #839DD7 | 0.055 |
| Deuteranopia (no green cones) | #7190D3 | 0.043 |
| Tritanopia (no blue cones) | #00AAAF | 0.086 |
| Achromatopsia (no color) | #959595 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509CD4
#509CD4
oklch(66.8% 0.113 242.9)
- #C58445
#C58445
oklch(66.7% 0.113 62.9)
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 #509CD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.049
- Cornflower Blue #6495ED ΔE 0.050
- Faded Blue #658CBB ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.052
- Greyblue #77A1B5 ΔE 0.064
- Soft Blue #6488EA ΔE 0.071
- Silver Lake Blue #778DA9 ΔE 0.072
- Cool Blue #4984B8 ΔE 0.073
Use #509CD4 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.