#3571B7
Closest named color: Windows Blue (#3778BF). oklch(54.3% 0.126 254), rgb(53, 113, 183).
Aa
White text reads best on this color (5.00:1).
About this color
#3571B7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.126 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.022 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #3571B7 |
| RGB | rgb(53, 113, 183) |
| HSL | hsl(212, 55%, 46%) |
| OKLCH | oklch(54.3% 0.126 254) |
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 #3571B7 | 5.00:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #3571B7 | 4.19:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #3571B7 text on white | 5.00:1 | AA | Lc 74.3 | Content text, not long reading |
| #3571B7 text on black | 4.19:1 | AA large text | Lc -27.4 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CBDBEE
oklch(88.5% 0.031 252.7)
-
Step 300
300
#A8C3E5
oklch(80.9% 0.057 254.3)
-
Step 400
400
#79A4D9
oklch(70.8% 0.091 254.1)
-
Step 500
500
#558CCE
oklch(63.1% 0.116 253.9)
-
Step 600
600 (this color)
#3571B7
oklch(54.3% 0.126 254)
-
Step 700
700
#2B62A1
oklch(49.1% 0.117 253.8)
-
Step 800
800
#255083
oklch(42.7% 0.098 254.3)
-
Step 900
900
#234369
oklch(37.8% 0.076 253.9)
-
Step 950
950
#15273D
oklch(26.9% 0.048 254.2)
#3571B7 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) | #5176BA | 0.033 |
| Deuteranopia (no green cones) | #3D6AB6 | 0.019 |
| Tritanopia (no blue cones) | #00818B | 0.097 |
| Achromatopsia (no color) | #6F6F6F | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3571B7
#3571B7
oklch(54.3% 0.126 254)
- #976400
#976400
oklch(54.4% 0.115 74.2)
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 #3571B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.022
- French Blue #436BAD ΔE 0.022
- Mid Blue #276AB3 ΔE 0.024
- Flat Blue #3C73A8 ΔE 0.026
- Nice Blue #107AB0 ΔE 0.034
- Muted Blue #3B719F ΔE 0.038
- Dull Blue #49759C ΔE 0.050
- Ocean Blue #03719C ΔE 0.052
Use #3571B7 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.