#509DD1
Closest named color: Faded Blue (#658CBB). oklch(66.9% 0.109 240.6), rgb(80, 157, 209).
Aa
Black text reads best on this color (7.08:1).
About this color
#509DD1 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.109 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.051 away. Black text reads best on it, at 7.08:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.08:1 |
| White text | 2.96:1 |
Values
| HEX | #509DD1 |
| RGB | rgb(80, 157, 209) |
| HSL | hsl(204, 58%, 57%) |
| OKLCH | oklch(66.9% 0.109 240.6) |
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 #509DD1 | 2.96:1 | Fails | Lc -61.3 | Content text, not long reading |
| Black text on #509DD1 | 7.08:1 | AAA | Lc 48.1 | Large or bold text, headings |
| #509DD1 text on white | 2.96:1 | Fails | Lc 56.0 | Large or bold text, headings |
| #509DD1 text on black | 7.08:1 | AAA | Lc -45.8 | 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
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A3C6E0
oklch(81% 0.053 240.5)
-
Step 400
400
#6EA8D1
oklch(70.7% 0.085 240.3)
-
Step 500
500 (this color)
#509DD1
oklch(66.9% 0.109 240.6)
-
Step 600
600
#1D7BB1
oklch(55.7% 0.118 240.2)
-
Step 700
700
#0B6798
oklch(49.1% 0.109 240.4)
-
Step 800
800
#11547C
oklch(42.7% 0.091 241.2)
-
Step 900
900
#184663
oklch(37.7% 0.07 240.2)
-
Step 950
950
#10293A
oklch(27% 0.044 240.8)
#509DD1 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) | #869DD3 | 0.058 |
| Deuteranopia (no green cones) | #7490D0 | 0.047 |
| Tritanopia (no blue cones) | #00AAAF | 0.080 |
| Achromatopsia (no color) | #969696 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509DD1
#509DD1
oklch(66.9% 0.109 240.6)
- #C5844B
#C5844B
oklch(66.8% 0.109 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 #509DD1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.051
- Chefchaouen Blue #4895EF ΔE 0.055
- Cornflower Blue #6495ED ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.058
- Greyblue #77A1B5 ΔE 0.059
- Turquoise Blue #06B1C4 ΔE 0.070
- Silver Lake Blue #778DA9 ΔE 0.070
- Dusty Blue #5A86AD ΔE 0.073
Use #509DD1 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.