#509FC4
Closest named color: Greyblue (#77A1B5). oklch(66.7% 0.095 230.8), rgb(80, 159, 196).
Aa
Black text reads best on this color (7.09:1).
About this color
#509FC4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.095 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.045 away. Black text reads best on it, at 7.09:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.09:1 |
| White text | 2.95:1 |
Values
| HEX | #509FC4 |
| RGB | rgb(80, 159, 196) |
| HSL | hsl(199, 50%, 54%) |
| OKLCH | oklch(66.7% 0.095 230.8) |
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 #509FC4 | 2.95:1 | Fails | Lc -61.3 | Content text, not long reading |
| Black text on #509FC4 | 7.09:1 | AAA | Lc 48.1 | Large or bold text, headings |
| #509FC4 text on white | 2.95:1 | Fails | Lc 55.9 | Large or bold text, headings |
| #509FC4 text on black | 7.09:1 | AAA | Lc -45.9 | 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
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C9DDE7
oklch(88.6% 0.025 229.2)
-
Step 300
300
#A3C7D9
oklch(80.9% 0.046 229.7)
-
Step 400
400
#6FA9C7
oklch(70.6% 0.075 231.8)
-
Step 500
500 (this color)
#509FC4
oklch(66.7% 0.095 230.8)
-
Step 600
600
#1C7DA4
oklch(55.5% 0.103 230.9)
-
Step 700
700
#0A6A8D
oklch(49.2% 0.096 230.6)
-
Step 800
800
#105672
oklch(42.6% 0.079 230.8)
-
Step 900
900
#18475C
oklch(37.6% 0.062 231)
-
Step 950
950
#102A36
oklch(27.1% 0.039 230.5)
#509FC4 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) | #8C9DC6 | 0.065 |
| Deuteranopia (no green cones) | #7C91C3 | 0.056 |
| Tritanopia (no blue cones) | #00A9AB | 0.064 |
| Achromatopsia (no color) | #969696 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #509FC4
#509FC4
oklch(66.7% 0.095 230.8)
- #C3835E
#C3835E
oklch(66.7% 0.094 50.6)
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 #509FC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.045
- Faded Blue #658CBB ΔE 0.052
- Cadet Blue #5F9EA0 ΔE 0.054
- Turquoise Blue #06B1C4 ΔE 0.056
- Silver Lake Blue #778DA9 ΔE 0.062
- Bluegrey #85A3B2 ΔE 0.063
- Blue Grey #758DA3 ΔE 0.065
- Bluey Grey #89A0B0 ΔE 0.066
Use #509FC4 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.