#5373CB
Closest named color: Windows Blue (#3778BF). oklch(57.4% 0.14 266.9), rgb(83, 115, 203).
Aa
Black text reads best on this color (4.68:1).
About this color
#5373CB is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.140 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #5373CB |
| RGB | rgb(83, 115, 203) |
| HSL | hsl(224, 54%, 56%) |
| OKLCH | oklch(57.4% 0.14 266.9) |
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 #5373CB | 4.48:1 | AA large text | Lc -76.4 | Fine for body text |
| Black text on #5373CB | 4.68:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #5373CB text on white | 4.48:1 | AA large text | Lc 70.9 | Content text, not long reading |
| #5373CB text on black | 4.68:1 | AA | Lc -30.8 | Non-text elements, placeholder text |
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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#AEC0EA
oklch(80.8% 0.063 266.8)
-
Step 400
400
#849FE0
oklch(70.8% 0.1 266.6)
-
Step 500
500
#6685D8
oklch(63.1% 0.13 267.2)
-
Step 600
600 (this color)
#5373CB
oklch(57.4% 0.14 266.9)
-
Step 700
700
#3F5BAA
oklch(49.1% 0.13 266.9)
-
Step 800
800
#344B8A
oklch(42.8% 0.108 266.8)
-
Step 900
900
#2D3F6E
oklch(37.7% 0.084 266.6)
-
Step 950
950
#1B2541
oklch(27% 0.054 267.8)
#5373CB 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) | #4B7DCE | 0.026 |
| Deuteranopia (no green cones) | #3B72C9 | 0.025 |
| Tritanopia (no blue cones) | #008795 | 0.124 |
| Achromatopsia (no color) | #777777 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5373CB
#5373CB
oklch(57.4% 0.14 266.9)
- #967300
#967300
oklch(57.4% 0.117 87.3)
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 #5373CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- Royal Blue #4169E1 ΔE 0.050
- French Blue #436BAD ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.055
- Cool Blue #4984B8 ΔE 0.061
- Steel Blue #4682B4 ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.062
- Mid Blue #276AB3 ΔE 0.063
Use #5373CB 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.