#5B75CF
Closest named color: Windows Blue (#3778BF). oklch(58.6% 0.141 269.5), rgb(91, 117, 207).
Aa
Black text reads best on this color (4.89:1).
About this color
#5B75CF is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.141 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.046 away. Black text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.89:1 |
| White text | 4.29:1 |
Values
| HEX | #5B75CF |
| RGB | rgb(91, 117, 207) |
| HSL | hsl(227, 55%, 58%) |
| OKLCH | oklch(58.6% 0.141 269.5) |
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 #5B75CF | 4.29:1 | AA large text | Lc -75.0 | Fine for body text |
| Black text on #5B75CF | 4.89:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #5B75CF text on white | 4.29:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #5B75CF text on black | 4.89:1 | AA | Lc -32.2 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#D0D9F1
oklch(88.6% 0.034 269.3)
-
Step 300
300
#B0BFEB
oklch(80.8% 0.065 270.2)
-
Step 400
400
#879EE0
oklch(70.7% 0.101 269)
-
Step 500
500
#6A84D8
oklch(63.1% 0.13 269.4)
-
Step 600
600 (this color)
#5B75CF
oklch(58.6% 0.141 269.5)
-
Step 700
700
#445AAA
oklch(49.2% 0.13 269.6)
-
Step 800
800
#384A8A
oklch(42.8% 0.108 269.6)
-
Step 900
900
#303E6E
oklch(37.7% 0.084 269.8)
-
Step 950
950
#1C2541
oklch(27.1% 0.054 269.1)
#5B75CF 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) | #4E7FD2 | 0.028 |
| Deuteranopia (no green cones) | #3F75CD | 0.030 |
| Tritanopia (no blue cones) | #128998 | 0.126 |
| Achromatopsia (no color) | #7A7A7A | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B75CF
#5B75CF
oklch(58.6% 0.141 269.5)
- #987700
#987700
oklch(58.5% 0.12 89.2)
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 #5B75CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.046
- Royal Blue #4169E1 ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.056
- Soft Blue #6488EA ΔE 0.062
- Cool Blue #4984B8 ΔE 0.062
- Steel Blue #4682B4 ΔE 0.064
- Cornflower #6A79F7 ΔE 0.064
- French Blue #436BAD ΔE 0.065
Use #5B75CF 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.