#6575CC
Closest named color: Windows Blue (#3778BF). oklch(59% 0.134 273.8), rgb(101, 117, 204).
Aa
Black text reads best on this color (4.96:1).
About this color
#6575CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.134 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.054 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #6575CC |
| RGB | rgb(101, 117, 204) |
| HSL | hsl(231, 50%, 60%) |
| OKLCH | oklch(59% 0.134 273.8) |
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 #6575CC | 4.22:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #6575CC | 4.96:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #6575CC text on white | 4.22:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #6575CC text on black | 4.96:1 | AA | Lc -32.6 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F0
oklch(88.5% 0.034 274.5)
-
Step 300
300
#B4BFE8
oklch(81% 0.059 273.2)
-
Step 400
400
#8D9CDD
oklch(70.6% 0.097 273.7)
-
Step 500
500
#7283D3
oklch(63.1% 0.122 273.3)
-
Step 600
600 (this color)
#6575CC
oklch(59% 0.134 273.8)
-
Step 700
700
#4B59A6
oklch(49.1% 0.124 273.3)
-
Step 800
800
#3E4987
oklch(42.8% 0.103 273.7)
-
Step 900
900
#343D6C
oklch(37.6% 0.081 273.7)
-
Step 950
950
#1F243F
oklch(27% 0.051 274.5)
#6575CC 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) | #5280CF | 0.033 |
| Deuteranopia (no green cones) | #4777CA | 0.035 |
| Tritanopia (no blue cones) | #3A8896 | 0.120 |
| Achromatopsia (no color) | #7B7B7B | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6575CC
#6575CC
oklch(59% 0.134 273.8)
- #957B00
#957B00
oklch(59% 0.121 94.1)
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 #6575CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.057
- Soft Blue #6488EA ΔE 0.061
- Cool Blue #4984B8 ΔE 0.063
- Cornflower #6A79F7 ΔE 0.065
- Royal Blue #4169E1 ΔE 0.066
- Steel Blue #4682B4 ΔE 0.066
- Slate Blue #6A5ACD ΔE 0.067
Use #6575CC 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.