#5366B8
Closest named color: French Blue (#436BAD). oklch(53.5% 0.13 271.6), rgb(83, 102, 184).
Aa
White text reads best on this color (5.30:1).
About this color
#5366B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.130 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.030 away. White text reads best on it, at 5.30:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.96:1 |
| White text | 5.30:1 |
Values
| HEX | #5366B8 |
| RGB | rgb(83, 102, 184) |
| HSL | hsl(229, 42%, 52%) |
| OKLCH | oklch(53.5% 0.13 271.6) |
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 #5366B8 | 5.30:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #5366B8 | 3.96:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #5366B8 text on white | 5.30:1 | AA | Lc 76.2 | Fine for body text |
| #5366B8 text on black | 3.96:1 | AA large text | Lc -25.5 | 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
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D1D8EF
oklch(88.4% 0.033 272.2)
-
Step 300
300
#B3BFE7
oklch(80.9% 0.058 272)
-
Step 400
400
#8B9DDB
oklch(70.6% 0.093 271.4)
-
Step 500
500
#7084D2
oklch(63.1% 0.12 271.7)
-
Step 600
600 (this color)
#5366B8
oklch(53.5% 0.13 271.6)
-
Step 700
700
#495AA5
oklch(49.1% 0.121 271.7)
-
Step 800
800
#3C4A85
oklch(42.7% 0.099 271.6)
-
Step 900
900
#333E6B
oklch(37.7% 0.078 271.8)
-
Step 950
950
#1E253F
oklch(27.1% 0.049 271.4)
#5366B8 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) | #4270BB | 0.030 |
| Deuteranopia (no green cones) | #3667B6 | 0.032 |
| Tritanopia (no blue cones) | #1E7886 | 0.116 |
| Achromatopsia (no color) | #6B6B6B | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5366B8
#5366B8
oklch(53.5% 0.13 271.6)
- #856A00
#856A00
oklch(53.5% 0.109 91.1)
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 #5366B8, closest first.
No curated palette has a color within ΔE 0.04 of #5366B8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.030
- Mid Blue #276AB3 ΔE 0.044
- Iris #6258C4 ΔE 0.045
- Dark Periwinkle #665FD1 ΔE 0.051
- Windows Blue #3778BF ΔE 0.052
- Flat Blue #3C73A8 ΔE 0.053
- Slate Blue #6A5ACD ΔE 0.056
- Light Indigo #6D5ACF ΔE 0.060
Use #5366B8 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.