#509DC9
Closest named color: Faded Blue (#658CBB). oklch(66.5% 0.1 236.1), rgb(80, 157, 201).
Aa
Black text reads best on this color (7.00:1).
About this color
#509DC9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.100 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.048 away. Black text reads best on it, at 7.00:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.00:1 |
| White text | 2.99:1 |
Values
| HEX | #509DC9 |
| RGB | rgb(80, 157, 201) |
| HSL | hsl(202, 53%, 55%) |
| OKLCH | oklch(66.5% 0.1 236.1) |
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 #509DC9 | 2.99:1 | Fails | Lc -61.8 | Content text, not long reading |
| Black text on #509DC9 | 7.00:1 | AAA | Lc 47.6 | Large or bold text, headings |
| #509DC9 text on white | 2.99:1 | Fails | Lc 56.4 | Large or bold text, headings |
| #509DC9 text on black | 7.00:1 | AAA | Lc -45.3 | 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 500.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DCE9
oklch(88.4% 0.027 237.6)
-
Step 300
300
#A3C6DC
oklch(80.8% 0.049 235.8)
-
Step 400
400
#6FA9CB
oklch(70.8% 0.078 235.2)
-
Step 500
500 (this color)
#509DC9
oklch(66.5% 0.1 236.1)
-
Step 600
600
#1F7CAA
oklch(55.6% 0.109 236)
-
Step 700
700
#0E6892
oklch(49% 0.101 236.3)
-
Step 800
800
#125577
oklch(42.7% 0.085 236.7)
-
Step 900
900
#184760
oklch(37.8% 0.066 235.7)
-
Step 950
950
#102938
oklch(26.9% 0.042 237.4)
#509DC9 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) | #889CCB | 0.060 |
| Deuteranopia (no green cones) | #7890C8 | 0.051 |
| Tritanopia (no blue cones) | #00A8AC | 0.071 |
| Achromatopsia (no color) | #959595 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509DC9
#509DC9
oklch(66.5% 0.1 236.1)
- #C38355
#C38355
oklch(66.5% 0.1 55.7)
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 #509DC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.048
- Greyblue #77A1B5 ΔE 0.051
- Silver Lake Blue #778DA9 ΔE 0.063
- Cadet Blue #5F9EA0 ΔE 0.064
- Turquoise Blue #06B1C4 ΔE 0.064
- Dark Sky Blue #448EE4 ΔE 0.067
- Chefchaouen Blue #4895EF ΔE 0.067
- Blue Grey #758DA3 ΔE 0.067
Use #509DC9 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.