#5375BF
Closest named color: Windows Blue (#3778BF). oklch(57.1% 0.121 264.3), rgb(83, 117, 191).
Aa
Black text reads best on this color (4.66:1).
About this color
#5375BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, 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 0.027 away. Black text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #5375BF |
| RGB | rgb(83, 117, 191) |
| HSL | hsl(221, 46%, 54%) |
| OKLCH | oklch(57.1% 0.121 264.3) |
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 #5375BF | 4.50:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #5375BF | 4.66:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #5375BF text on white | 4.50:1 | AA | Lc 71.1 | Content text, not long reading |
| #5375BF text on black | 4.66:1 | AA | Lc -30.6 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
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)
#5375BF
oklch(57.1% 0.121 264.3)
-
Step 700
700
#405EA0
oklch(49.1% 0.112 264.3)
-
Step 800
800
#354D82
oklch(42.8% 0.093 264.4)
-
Step 900
900
#2E4068
oklch(37.6% 0.073 264.8)
-
Step 950
950
#1B263D
oklch(27% 0.046 264.1)
#5375BF 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) | #567CC2 | 0.020 |
| Deuteranopia (no green cones) | #4972BD | 0.015 |
| Tritanopia (no blue cones) | #068591 | 0.108 |
| Achromatopsia (no color) | #777777 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5375BF
#5375BF
oklch(57.1% 0.121 264.3)
- #987100
#987100
oklch(57.2% 0.117 84.5)
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 #5375BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.027
- French Blue #436BAD ΔE 0.043
- Steel Blue #4682B4 ΔE 0.045
- Flat Blue #3C73A8 ΔE 0.045
- Cool Blue #4984B8 ΔE 0.046
- Off Blue #5684AE ΔE 0.056
- Nice Blue #107AB0 ΔE 0.056
- Dull Blue #49759C ΔE 0.058
Use #5375BF 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.