#509FDA
Closest named color: Cornflower Blue (#6495ED). oklch(67.8% 0.117 243.4), rgb(80, 159, 218).
Aa
Black text reads best on this color (7.31:1).
About this color
#509FDA is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.117 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.047 away. Black text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.31:1 |
| White text | 2.87:1 |
Values
| HEX | #509FDA |
| RGB | rgb(80, 159, 218) |
| HSL | hsl(206, 65%, 58%) |
| OKLCH | oklch(67.8% 0.117 243.4) |
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 #509FDA | 2.87:1 | Fails | Lc -60.0 | Large or bold text, headings |
| Black text on #509FDA | 7.31:1 | AAA | Lc 49.4 | Large or bold text, headings |
| #509FDA text on white | 2.87:1 | Fails | Lc 54.7 | Large or bold text, headings |
| #509FDA text on black | 7.31:1 | AAA | Lc -47.1 | 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
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C3DDF2
oklch(88.5% 0.04 242.4)
-
Step 300
300
#98C7ED
oklch(81% 0.073 243.2)
-
Step 400
400 (this color)
#509FDA
oklch(67.8% 0.117 243.4)
-
Step 500
500
#1191DC
oklch(63.1% 0.15 243.3)
-
Step 600
600
#007ABC
oklch(55.7% 0.136 243.3)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#032942
oklch(27% 0.062 243.1)
#509FDA 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) | #85A0DD | 0.056 |
| Deuteranopia (no green cones) | #7292D9 | 0.045 |
| Tritanopia (no blue cones) | #00ADB3 | 0.087 |
| Achromatopsia (no color) | #989898 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FDA
#509FDA
oklch(67.8% 0.117 243.4)
- #CA8643
#CA8643
oklch(67.7% 0.118 63)
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 #509FDA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.047
- Chefchaouen Blue #4895EF ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.055
- Faded Blue #658CBB ΔE 0.061
- Greyblue #77A1B5 ΔE 0.067
- Soft Blue #6488EA ΔE 0.072
- Turquoise Blue #06B1C4 ΔE 0.073
- Silver Lake Blue #778DA9 ΔE 0.081
Use #509FDA 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.