#509FDC
Closest named color: Cornflower Blue (#6495ED). oklch(67.9% 0.119 244.2), rgb(80, 159, 220).
Aa
Black text reads best on this color (7.33:1).
About this color
#509FDC is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.119 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.045 away. Black text reads best on it, at 7.33:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.33:1 |
| White text | 2.86:1 |
Values
| HEX | #509FDC |
| RGB | rgb(80, 159, 220) |
| HSL | hsl(206, 67%, 59%) |
| OKLCH | oklch(67.9% 0.119 244.2) |
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 #509FDC | 2.86:1 | Fails | Lc -59.9 | Large or bold text, headings |
| Black text on #509FDC | 7.33:1 | AAA | Lc 49.5 | Large or bold text, headings |
| #509FDC text on white | 2.86:1 | Fails | Lc 54.6 | Large or bold text, headings |
| #509FDC text on black | 7.33:1 | 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
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C3DDF3
oklch(88.5% 0.041 243.7)
-
Step 300
300
#98C7EE
oklch(81% 0.074 243.9)
-
Step 400
400 (this color)
#509FDC
oklch(67.9% 0.119 244.2)
-
Step 500
500
#1090DE
oklch(63% 0.153 244.4)
-
Step 600
600
#0079BD
oklch(55.5% 0.138 244.2)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#032943
oklch(27.1% 0.063 244.1)
#509FDC 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) | #84A0DF | 0.055 |
| Deuteranopia (no green cones) | #7192DB | 0.044 |
| Tritanopia (no blue cones) | #00AEB4 | 0.090 |
| Achromatopsia (no color) | #999999 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FDC
#509FDC
oklch(67.9% 0.119 244.2)
- #CA8740
#CA8740
oklch(67.8% 0.119 64.8)
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 #509FDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.045
- Chefchaouen Blue #4895EF ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.053
- Faded Blue #658CBB ΔE 0.062
- Greyblue #77A1B5 ΔE 0.069
- Soft Blue #6488EA ΔE 0.070
- Turquoise Blue #06B1C4 ΔE 0.075
- Dodger Blue #1E90FF ΔE 0.079
Use #509FDC 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.