#5370BE
Closest named color: Windows Blue (#3778BF). oklch(56% 0.126 267), rgb(83, 112, 190).
Aa
White text reads best on this color (4.74:1).
About this color
#5370BE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.126 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.032 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #5370BE |
| RGB | rgb(83, 112, 190) |
| HSL | hsl(224, 45%, 54%) |
| OKLCH | oklch(56% 0.126 267) |
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 #5370BE | 4.74:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #5370BE | 4.42:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #5370BE text on white | 4.74:1 | AA | Lc 72.7 | Content text, not long reading |
| #5370BE text on black | 4.42:1 | AA large text | Lc -28.9 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B0C0E6
oklch(80.8% 0.057 267.2)
-
Step 400
400
#879FDA
oklch(70.7% 0.091 267)
-
Step 500
500
#6A86D0
oklch(63.1% 0.116 267.3)
-
Step 600
600 (this color)
#5370BE
oklch(56% 0.126 267)
-
Step 700
700
#435CA3
oklch(49.1% 0.118 267.4)
-
Step 800
800
#374C84
oklch(42.8% 0.097 266.8)
-
Step 900
900
#2F3F6A
oklch(37.6% 0.077 267.2)
-
Step 950
950
#1C253E
oklch(26.9% 0.049 268)
#5370BE 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) | #4F78C1 | 0.021 |
| Deuteranopia (no green cones) | #426FBC | 0.020 |
| Tritanopia (no blue cones) | #0D818E | 0.112 |
| Achromatopsia (no color) | #737373 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5370BE
#5370BE
oklch(56% 0.126 267)
- #916F00
#916F00
oklch(56% 0.114 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 #5370BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.032
- French Blue #436BAD ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.046
- Mid Blue #276AB3 ΔE 0.051
- Steel Blue #4682B4 ΔE 0.056
- Muted Blue #3B719F ΔE 0.058
- Cool Blue #4984B8 ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.059
Use #5370BE 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.