#5175CB
Closest named color: Windows Blue (#3778BF). oklch(57.7% 0.139 265.2), rgb(81, 117, 203).
Aa
Black text reads best on this color (4.75:1).
About this color
#5175CB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.139 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.033 away. Black text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.75:1 |
| White text | 4.41:1 |
Values
| HEX | #5175CB |
| RGB | rgb(81, 117, 203) |
| HSL | hsl(222, 54%, 56%) |
| OKLCH | oklch(57.7% 0.139 265.2) |
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 #5175CB | 4.41:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #5175CB | 4.75:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #5175CB text on white | 4.41:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #5175CB text on black | 4.75:1 | AA | Lc -31.3 | 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
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#ADC1EA
oklch(81% 0.062 264.6)
-
Step 400
400
#829FDF
oklch(70.6% 0.1 265.2)
-
Step 500
500
#6486D7
oklch(63.1% 0.128 265.7)
-
Step 600
600 (this color)
#5175CB
oklch(57.7% 0.139 265.2)
-
Step 700
700
#3C5CA9
oklch(49.1% 0.129 265)
-
Step 800
800
#324B89
oklch(42.6% 0.107 265.6)
-
Step 900
900
#2C3F6E
oklch(37.6% 0.084 265.9)
-
Step 950
950
#1A2540
oklch(26.9% 0.053 266.2)
#5175CB 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) | #4F7ECE | 0.024 |
| Deuteranopia (no green cones) | #3D73C9 | 0.022 |
| Tritanopia (no blue cones) | #008896 | 0.120 |
| Achromatopsia (no color) | #787878 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5175CB
#5175CB
oklch(57.7% 0.139 265.2)
- #997300
#997300
oklch(57.7% 0.118 85.5)
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 #5175CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.033
- Royal Blue #4169E1 ΔE 0.053
- French Blue #436BAD ΔE 0.055
- Cool Blue #4984B8 ΔE 0.056
- Steel Blue #4682B4 ΔE 0.057
- Water Blue #0E87CC ΔE 0.058
- Flat Blue #3C73A8 ΔE 0.060
- Dark Periwinkle #665FD1 ΔE 0.060
Use #5175CB 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.