#5173BD
Closest named color: Windows Blue (#3778BF). oklch(56.5% 0.121 264.2), rgb(81, 115, 189).
Aa
White text reads best on this color (4.62:1).
About this color
#5173BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.121 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.026 away. White text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.53:1 |
| White text | 4.62:1 |
Values
| HEX | #5173BD |
| RGB | rgb(81, 115, 189) |
| HSL | hsl(221, 45%, 53%) |
| OKLCH | oklch(56.5% 0.121 264.2) |
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 #5173BD | 4.62:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #5173BD | 4.53:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #5173BD text on white | 4.62:1 | AA | Lc 72.0 | Content text, not long reading |
| #5173BD text on black | 4.53:1 | AA | Lc -29.7 | 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
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CFD9EE
oklch(88.4% 0.031 265.3)
-
Step 300
300
#AFC1E5
oklch(80.9% 0.055 264.2)
-
Step 400
400
#85A0D8
oklch(70.7% 0.088 264.4)
-
Step 500
500
#6788CD
oklch(63.2% 0.111 264)
-
Step 600
600 (this color)
#5173BD
oklch(56.5% 0.121 264.2)
-
Step 700
700
#3F5EA0
oklch(49.1% 0.112 263.8)
-
Step 800
800
#344D82
oklch(42.7% 0.094 263.8)
-
Step 900
900
#2E4068
oklch(37.6% 0.073 264.8)
-
Step 950
950
#1B263D
oklch(27% 0.046 264.1)
#5173BD 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) | #547AC0 | 0.020 |
| Deuteranopia (no green cones) | #4670BB | 0.016 |
| Tritanopia (no blue cones) | #00838F | 0.108 |
| Achromatopsia (no color) | #757575 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5173BD
#5173BD
oklch(56.5% 0.121 264.2)
- #966F00
#966F00
oklch(56.6% 0.116 84.1)
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 #5173BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.026
- French Blue #436BAD ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.041
- Steel Blue #4682B4 ΔE 0.048
- Cool Blue #4984B8 ΔE 0.050
- Mid Blue #276AB3 ΔE 0.052
- Nice Blue #107AB0 ΔE 0.054
- Muted Blue #3B719F ΔE 0.054
Use #5173BD 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.