#509EC8
Closest named color: Greyblue (#77A1B5). oklch(66.7% 0.099 234.5), rgb(80, 158, 200).
Aa
Black text reads best on this color (7.06:1).
About this color
#509EC8 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.099 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.049 away. Black text reads best on it, at 7.06:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.06:1 |
| White text | 2.97:1 |
Values
| HEX | #509EC8 |
| RGB | rgb(80, 158, 200) |
| HSL | hsl(201, 52%, 55%) |
| OKLCH | oklch(66.7% 0.099 234.5) |
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 #509EC8 | 2.97:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #509EC8 | 7.06:1 | AAA | Lc 47.9 | Large or bold text, headings |
| #509EC8 text on white | 2.97:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #509EC8 text on black | 7.06:1 | AAA | Lc -45.7 | 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
#C9DDE9
oklch(88.6% 0.027 234)
-
Step 300
300
#A3C6DC
oklch(80.8% 0.049 235.8)
-
Step 400
400
#6FA9CA
oklch(70.7% 0.077 234.4)
-
Step 500
500 (this color)
#509EC8
oklch(66.7% 0.099 234.5)
-
Step 600
600
#1D7CA9
oklch(55.5% 0.108 235.1)
-
Step 700
700
#0B6991
oklch(49.2% 0.1 234.5)
-
Step 800
800
#115675
oklch(42.8% 0.082 233.7)
-
Step 900
900
#18475F
oklch(37.8% 0.065 234.6)
-
Step 950
950
#102A37
oklch(27.1% 0.04 232.6)
#509EC8 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) | #8A9DCA | 0.063 |
| Deuteranopia (no green cones) | #7990C7 | 0.054 |
| Tritanopia (no blue cones) | #00A9AC | 0.070 |
| Achromatopsia (no color) | #969696 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509EC8
#509EC8
oklch(66.7% 0.099 234.5)
- #C38358
#C38358
oklch(66.6% 0.098 54.1)
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 #509EC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.049
- Faded Blue #658CBB ΔE 0.050
- Turquoise Blue #06B1C4 ΔE 0.060
- Cadet Blue #5F9EA0 ΔE 0.061
- Silver Lake Blue #778DA9 ΔE 0.063
- Blue Grey #758DA3 ΔE 0.067
- Bluegrey #85A3B2 ΔE 0.067
- Dusty Blue #5A86AD ΔE 0.069
Use #509EC8 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.