#509EC5
Closest named color: Greyblue (#77A1B5). oklch(66.6% 0.096 232.5), rgb(80, 158, 197).
Aa
Black text reads best on this color (7.03:1).
About this color
#509EC5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.096 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.047 away. Black text reads best on it, at 7.03:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.03:1 |
| White text | 2.98:1 |
Values
| HEX | #509EC5 |
| RGB | rgb(80, 158, 197) |
| HSL | hsl(200, 50%, 54%) |
| OKLCH | oklch(66.6% 0.096 232.5) |
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 #509EC5 | 2.98:1 | Fails | Lc -61.6 | Content text, not long reading |
| Black text on #509EC5 | 7.03:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #509EC5 text on white | 2.98:1 | Fails | Lc 56.3 | Large or bold text, headings |
| #509EC5 text on black | 7.03:1 | AAA | Lc -45.5 | 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
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A3C7DA
oklch(81% 0.047 231.1)
-
Step 400
400
#6FA9C8
oklch(70.6% 0.076 232.7)
-
Step 500
500 (this color)
#509EC5
oklch(66.6% 0.096 232.5)
-
Step 600
600
#1E7DA6
oklch(55.6% 0.104 232.5)
-
Step 700
700
#0C698E
oklch(49% 0.097 232.5)
-
Step 800
800
#115673
oklch(42.7% 0.08 231.9)
-
Step 900
900
#18475D
oklch(37.7% 0.063 232.2)
-
Step 950
950
#102A37
oklch(27.1% 0.04 232.6)
#509EC5 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) | #8B9CC7 | 0.064 |
| Deuteranopia (no green cones) | #7B90C4 | 0.055 |
| Tritanopia (no blue cones) | #00A9AB | 0.067 |
| Achromatopsia (no color) | #959595 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509EC5
#509EC5
oklch(66.6% 0.096 232.5)
- #C3835B
#C3835B
oklch(66.6% 0.096 52.4)
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 #509EC5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.047
- Faded Blue #658CBB ΔE 0.050
- Cadet Blue #5F9EA0 ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.059
- Silver Lake Blue #778DA9 ΔE 0.061
- Blue Grey #758DA3 ΔE 0.064
- Bluegrey #85A3B2 ΔE 0.065
- Bluey Grey #89A0B0 ΔE 0.067
Use #509EC5 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.