#5B75CA
Closest named color: Windows Blue (#3778BF). oklch(58.2% 0.134 269.1), rgb(91, 117, 202).
Aa
Black text reads best on this color (4.84:1).
About this color
#5B75CA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.134 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.042 away. Black text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.84:1 |
| White text | 4.33:1 |
Values
| HEX | #5B75CA |
| RGB | rgb(91, 117, 202) |
| HSL | hsl(226, 51%, 57%) |
| OKLCH | oklch(58.2% 0.134 269.1) |
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 #5B75CA | 4.33:1 | AA large text | Lc -75.3 | Fine for body text |
| Black text on #5B75CA | 4.84:1 | AA | Lc 34.2 | Non-text elements, placeholder text |
| #5B75CA text on white | 4.33:1 | AA large text | Lc 69.9 | Content text, not long reading |
| #5B75CA text on black | 4.84:1 | AA | Lc -31.8 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B1C0E9
oklch(81% 0.06 269.3)
-
Step 400
400
#889EDD
oklch(70.7% 0.096 269.1)
-
Step 500
500
#6B85D4
oklch(63.1% 0.123 268.9)
-
Step 600
600 (this color)
#5B75CA
oklch(58.2% 0.134 269.1)
-
Step 700
700
#445BA7
oklch(49.2% 0.124 268.8)
-
Step 800
800
#384A87
oklch(42.6% 0.104 269.3)
-
Step 900
900
#303F6C
oklch(37.8% 0.08 268.5)
-
Step 950
950
#1C253F
oklch(27% 0.05 268.4)
#5B75CA 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) | #517FCD | 0.027 |
| Deuteranopia (no green cones) | #4375C8 | 0.027 |
| Tritanopia (no blue cones) | #1D8896 | 0.120 |
| Achromatopsia (no color) | #797979 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B75CA
#5B75CA
oklch(58.2% 0.134 269.1)
- #977600
#977600
oklch(58.2% 0.119 89.1)
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 #5B75CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.042
- Cool Blue #4984B8 ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.058
- Steel Blue #4682B4 ΔE 0.058
- Royal Blue #4169E1 ΔE 0.059
- French Blue #436BAD ΔE 0.060
- Water Blue #0E87CC ΔE 0.065
- Flat Blue #3C73A8 ΔE 0.065
Use #5B75CA 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.