#5B72C8
Closest named color: Windows Blue (#3778BF). oklch(57.5% 0.135 270.4), rgb(91, 114, 200).
Aa
Black text reads best on this color (4.68:1).
About this color
#5B72C8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.135 and its hue 270°. 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 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #5B72C8 |
| RGB | rgb(91, 114, 200) |
| HSL | hsl(227, 50%, 57%) |
| OKLCH | oklch(57.5% 0.135 270.4) |
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 #5B72C8 | 4.48:1 | AA large text | Lc -76.4 | Fine for body text |
| Black text on #5B72C8 | 4.68:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #5B72C8 text on white | 4.48:1 | AA large text | Lc 70.9 | Content text, not long reading |
| #5B72C8 text on black | 4.68:1 | AA | Lc -30.7 | 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
#B1BFE9
oklch(80.8% 0.061 270.5)
-
Step 400
400
#899EDE
oklch(70.8% 0.097 269.9)
-
Step 500
500
#6D84D4
oklch(63.1% 0.124 270.4)
-
Step 600
600 (this color)
#5B72C8
oklch(57.5% 0.135 270.4)
-
Step 700
700
#465AA7
oklch(49.1% 0.125 270.3)
-
Step 800
800
#3A4A87
oklch(42.7% 0.103 270.5)
-
Step 900
900
#313E6C
oklch(37.6% 0.081 270.3)
-
Step 950
950
#1D253F
oklch(27.1% 0.05 269.9)
#5B72C8 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) | #4D7CCB | 0.028 |
| Deuteranopia (no green cones) | #4072C6 | 0.030 |
| Tritanopia (no blue cones) | #218593 | 0.121 |
| Achromatopsia (no color) | #777777 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B72C8
#5B72C8
oklch(57.5% 0.135 270.4)
- #937500
#937500
oklch(57.5% 0.118 90.8)
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 #5B72C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.042
- Dark Periwinkle #665FD1 ΔE 0.052
- French Blue #436BAD ΔE 0.055
- Royal Blue #4169E1 ΔE 0.057
- Cool Blue #4984B8 ΔE 0.062
- Steel Blue #4682B4 ΔE 0.062
- Slate Blue #6A5ACD ΔE 0.063
- Flat Blue #3C73A8 ΔE 0.063
Use #5B72C8 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.