#506EC9
Closest named color: Windows Blue (#3778BF). oklch(56.1% 0.145 267.8), rgb(80, 110, 201).
Aa
White text reads best on this color (4.75:1).
About this color
#506EC9 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.145 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.039 away. White text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.41:1 |
| White text | 4.75:1 |
Values
| HEX | #506EC9 |
| RGB | rgb(80, 110, 201) |
| HSL | hsl(225, 53%, 55%) |
| OKLCH | oklch(56.1% 0.145 267.8) |
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 #506EC9 | 4.75:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #506EC9 | 4.41:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #506EC9 text on white | 4.75:1 | AA | Lc 72.8 | Content text, not long reading |
| #506EC9 text on black | 4.41:1 | AA large text | Lc -28.9 | Dividers and decoration only |
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 600.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CFD9F2
oklch(88.5% 0.036 268.3)
-
Step 300
300
#AEC0EC
oklch(80.9% 0.066 267.5)
-
Step 400
400
#849EE2
oklch(70.6% 0.104 267.7)
-
Step 500
500
#6785DA
oklch(63.2% 0.133 267.8)
-
Step 600
600 (this color)
#506EC9
oklch(56.1% 0.145 267.8)
-
Step 700
700
#405AAC
oklch(49.1% 0.134 268)
-
Step 800
800
#354A8C
oklch(42.7% 0.112 268.1)
-
Step 900
900
#2E3E70
oklch(37.7% 0.088 268.6)
-
Step 950
950
#1B2541
oklch(27% 0.054 267.8)
#506EC9 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) | #4379CC | 0.030 |
| Deuteranopia (no green cones) | #316EC7 | 0.030 |
| Tritanopia (no blue cones) | #008292 | 0.124 |
| Achromatopsia (no color) | #737373 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #506EC9
#506EC9
oklch(56.1% 0.145 267.8)
- #917000
#917000
oklch(56.2% 0.115 88.1)
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 #506EC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.039
- Royal Blue #4169E1 ΔE 0.044
- French Blue #436BAD ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.047
- Mid Blue #276AB3 ΔE 0.055
- Iris #6258C4 ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.058
- Light Indigo #6D5ACF ΔE 0.061
Use #506EC9 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.