#506CBF
Closest named color: French Blue (#436BAD). oklch(55% 0.133 267.8), rgb(80, 108, 191).
Aa
White text reads best on this color (4.95:1).
About this color
#506CBF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.133 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.033 away. White text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.23:1 |
| White text | 4.95:1 |
Values
| HEX | #506CBF |
| RGB | rgb(80, 108, 191) |
| HSL | hsl(225, 46%, 53%) |
| OKLCH | oklch(55% 0.133 267.8) |
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 #506CBF | 4.95:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #506CBF | 4.23:1 | AA large text | Lc 30.0 | Dividers and decoration only |
| #506CBF text on white | 4.95:1 | AA | Lc 74.1 | Content text, not long reading |
| #506CBF text on black | 4.23:1 | AA large text | Lc -27.6 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#CFD9F0
oklch(88.5% 0.033 266.9)
-
Step 300
300
#B0C0E8
oklch(80.9% 0.059 267.9)
-
Step 400
400
#879FDD
oklch(70.8% 0.095 267.7)
-
Step 500
500
#6985D4
oklch(63% 0.124 268)
-
Step 600
600 (this color)
#506CBF
oklch(55% 0.133 267.8)
-
Step 700
700
#425BA6
oklch(49% 0.124 267.8)
-
Step 800
800
#374B87
oklch(42.8% 0.103 268)
-
Step 900
900
#2F3F6C
oklch(37.7% 0.08 267.7)
-
Step 950
950
#1C253F
oklch(27% 0.05 268.4)
#506CBF 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) | #4775C2 | 0.024 |
| Deuteranopia (no green cones) | #386BBD | 0.026 |
| Tritanopia (no blue cones) | #007E8C | 0.118 |
| Achromatopsia (no color) | #707070 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #506CBF
#506CBF
oklch(55% 0.133 267.8)
- #8D6D00
#8D6D00
oklch(55.1% 0.113 88.2)
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 #506CBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.033
- Windows Blue #3778BF ΔE 0.038
- Mid Blue #276AB3 ΔE 0.045
- Flat Blue #3C73A8 ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.053
- Iris #6258C4 ΔE 0.055
- Royal Blue #4169E1 ΔE 0.056
- Slate Blue #6A5ACD ΔE 0.060
Use #506CBF 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.