#506FBB
Closest named color: French Blue (#436BAD). oklch(55.4% 0.124 265.8), rgb(80, 111, 187).
Aa
White text reads best on this color (4.84:1).
About this color
#506FBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.124 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.029 away. White text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.33:1 |
| White text | 4.84:1 |
Values
| HEX | #506FBB |
| RGB | rgb(80, 111, 187) |
| HSL | hsl(223, 44%, 52%) |
| OKLCH | oklch(55.4% 0.124 265.8) |
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 #506FBB | 4.84:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #506FBB | 4.33:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #506FBB text on white | 4.84:1 | AA | Lc 73.4 | Content text, not long reading |
| #506FBB text on black | 4.33:1 | AA large text | Lc -28.3 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#CFD9EE
oklch(88.4% 0.031 265.3)
-
Step 300
300
#B0C1E6
oklch(81% 0.056 265.7)
-
Step 400
400
#86A0D9
oklch(70.8% 0.089 265.3)
-
Step 500
500
#6987CF
oklch(63.2% 0.114 266)
-
Step 600
600 (this color)
#506FBB
oklch(55.4% 0.124 265.8)
-
Step 700
700
#415DA2
oklch(49.1% 0.116 265.7)
-
Step 800
800
#364C83
oklch(42.7% 0.096 266)
-
Step 900
900
#2F4069
oklch(37.8% 0.074 265.9)
-
Step 950
950
#1B263E
oklch(27.1% 0.048 264.7)
#506FBB 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) | #4F77BE | 0.022 |
| Deuteranopia (no green cones) | #416DB9 | 0.018 |
| Tritanopia (no blue cones) | #00808C | 0.111 |
| Achromatopsia (no color) | #717171 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #506FBB
#506FBB
oklch(55.4% 0.124 265.8)
- #906D00
#906D00
oklch(55.4% 0.113 86.3)
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 #506FBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.029
- Windows Blue #3778BF ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.041
- Mid Blue #276AB3 ΔE 0.045
- Muted Blue #3B719F ΔE 0.052
- Nice Blue #107AB0 ΔE 0.057
- Dull Blue #49759C ΔE 0.057
- Steel Blue #4682B4 ΔE 0.057
Use #506FBB 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.