#6571B8
Closest named color: Windows Blue (#3778BF). oklch(57% 0.11 275.1), rgb(101, 113, 184).
Aa
Black text reads best on this color (4.60:1).
About this color
#6571B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.110 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.050 away. Black text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.60:1 |
| White text | 4.55:1 |
Values
| HEX | #6571B8 |
| RGB | rgb(101, 113, 184) |
| HSL | hsl(231, 37%, 56%) |
| OKLCH | oklch(57% 0.11 275.1) |
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 #6571B8 | 4.55:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #6571B8 | 4.60:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #6571B8 text on white | 4.55:1 | AA | Lc 71.6 | Content text, not long reading |
| #6571B8 text on black | 4.60:1 | AA | Lc -30.1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D3D8EC
oklch(88.4% 0.028 274.6)
-
Step 300
300
#B7BFE1
oklch(81% 0.049 274.8)
-
Step 400
400
#929DD3
oklch(70.7% 0.08 275.3)
-
Step 500
500
#7884C7
oklch(63.1% 0.102 275.4)
-
Step 600
600 (this color)
#6571B8
oklch(57% 0.11 275.1)
-
Step 700
700
#505B9A
oklch(49.2% 0.102 274.6)
-
Step 800
800
#424A7D
oklch(42.7% 0.085 275.5)
-
Step 900
900
#373E65
oklch(37.6% 0.067 275)
-
Step 950
950
#20253B
oklch(27.1% 0.042 273.5)
#6571B8 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) | #5779BB | 0.026 |
| Deuteranopia (no green cones) | #5073B6 | 0.027 |
| Tritanopia (no blue cones) | #48808C | 0.098 |
| Achromatopsia (no color) | #767676 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6571B8
#6571B8
oklch(57% 0.11 275.1)
- #8C7616
#8C7616
oklch(57% 0.11 94.9)
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 #6571B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.050
- French Blue #436BAD ΔE 0.050
- Flat Blue #3C73A8 ΔE 0.055
- Steel Blue #4682B4 ΔE 0.057
- Cool Blue #4984B8 ΔE 0.058
- Off Blue #5684AE ΔE 0.060
- Dull Blue #49759C ΔE 0.061
- Stormy Blue #507B9C ΔE 0.064
Use #6571B8 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.