#6571BD
Closest named color: Windows Blue (#3778BF). oklch(57.3% 0.118 275.3), rgb(101, 113, 189).
Aa
Black text reads best on this color (4.65:1).
About this color
#6571BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.118 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 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.65:1 |
| White text | 4.51:1 |
Values
| HEX | #6571BD |
| RGB | rgb(101, 113, 189) |
| HSL | hsl(232, 40%, 57%) |
| OKLCH | oklch(57.3% 0.118 275.3) |
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 #6571BD | 4.51:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #6571BD | 4.65:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #6571BD text on white | 4.51:1 | AA | Lc 71.2 | Content text, not long reading |
| #6571BD text on black | 4.65:1 | AA | Lc -30.4 | 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
#D3D8ED
oklch(88.5% 0.029 275.1)
-
Step 300
300
#B6BFE3
oklch(81% 0.052 274.2)
-
Step 400
400
#919DD6
oklch(70.8% 0.085 274.9)
-
Step 500
500
#7783CB
oklch(63.1% 0.109 275.6)
-
Step 600
600 (this color)
#6571BD
oklch(57.3% 0.118 275.3)
-
Step 700
700
#505A9E
oklch(49.2% 0.109 275.3)
-
Step 800
800
#414A80
oklch(42.8% 0.09 274.8)
-
Step 900
900
#373E67
oklch(37.8% 0.071 275.1)
-
Step 950
950
#20243C
oklch(26.9% 0.045 275.7)
#6571BD 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) | #547AC0 | 0.029 |
| Deuteranopia (no green cones) | #4D73BB | 0.030 |
| Tritanopia (no blue cones) | #45818E | 0.104 |
| Achromatopsia (no color) | #767676 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6571BD
#6571BD
oklch(57.3% 0.118 275.3)
- #8E7701
#8E7701
oklch(57.4% 0.118 95.4)
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 #6571BD, 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 0.053
- Dark Periwinkle #665FD1 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.060
- Flat Blue #3C73A8 ΔE 0.060
- Cool Blue #4984B8 ΔE 0.060
- Off Blue #5684AE ΔE 0.064
- Slate Blue #6A5ACD ΔE 0.066
Use #6571BD 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.