#509ACC
Closest named color: Faded Blue (#658CBB). oklch(65.9% 0.105 240.5), rgb(80, 154, 204).
Aa
Black text reads best on this color (6.83:1).
About this color
#509ACC is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.105 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.042 away. Black text reads best on it, at 6.83:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.83:1 |
| White text | 3.07:1 |
Values
| HEX | #509ACC |
| RGB | rgb(80, 154, 204) |
| HSL | hsl(204, 55%, 56%) |
| OKLCH | oklch(65.9% 0.105 240.5) |
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 #509ACC | 3.07:1 | AA large text | Lc -62.8 | Content text, not long reading |
| Black text on #509ACC | 6.83:1 | AA | Lc 46.6 | Large or bold text, headings |
| #509ACC text on white | 3.07:1 | AA large text | Lc 57.4 | Large or bold text, headings |
| #509ACC text on black | 6.83:1 | AA | Lc -44.3 | Non-text elements, placeholder text |
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
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C6DF
oklch(81% 0.051 240.1)
-
Step 400
400
#70A8CF
oklch(70.8% 0.082 239.8)
-
Step 500
500 (this color)
#509ACC
oklch(65.9% 0.105 240.5)
-
Step 600
600
#237BAF
oklch(55.7% 0.114 240.1)
-
Step 700
700
#136797
oklch(49.1% 0.107 240.7)
-
Step 800
800
#15547A
oklch(42.6% 0.088 240.7)
-
Step 900
900
#1A4662
oklch(37.8% 0.068 240)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#509ACC 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) | #839ACE | 0.055 |
| Deuteranopia (no green cones) | #738DCB | 0.047 |
| Tritanopia (no blue cones) | #00A6AB | 0.078 |
| Achromatopsia (no color) | #939393 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509ACC
#509ACC
oklch(65.9% 0.105 240.5)
- #C1824B
#C1824B
oklch(66% 0.106 60.5)
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 #509ACC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.058
- Cornflower Blue #6495ED ΔE 0.059
- Greyblue #77A1B5 ΔE 0.059
- Silver Lake Blue #778DA9 ΔE 0.063
- Dusty Blue #5A86AD ΔE 0.063
- Cool Blue #4984B8 ΔE 0.065
Use #509ACC 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.