#5B74CA
Closest named color: Windows Blue (#3778BF). oklch(58% 0.135 269.6), rgb(91, 116, 202).
Aa
Black text reads best on this color (4.79:1).
About this color
#5B74CA 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 4.79:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.79:1 |
| White text | 4.37:1 |
Values
| HEX | #5B74CA |
| RGB | rgb(91, 116, 202) |
| HSL | hsl(226, 51%, 57%) |
| OKLCH | oklch(58% 0.135 269.6) |
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 #5B74CA | 4.37:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #5B74CA | 4.79:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #5B74CA text on white | 4.37:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #5B74CA text on black | 4.79:1 | AA | Lc -31.5 | 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
#889EDE
oklch(70.7% 0.097 269.3)
-
Step 500
500
#6C84D5
oklch(63.1% 0.125 270)
-
Step 600
600 (this color)
#5B74CA
oklch(58% 0.135 269.6)
-
Step 700
700
#455AA7
oklch(49% 0.125 269.8)
-
Step 800
800
#394A88
oklch(42.7% 0.105 270)
-
Step 900
900
#313E6D
oklch(37.7% 0.082 270.4)
-
Step 950
950
#1C2540
oklch(27.1% 0.052 268.8)
#5B74CA 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) | #4F7ECD | 0.028 |
| Deuteranopia (no green cones) | #4274C8 | 0.028 |
| Tritanopia (no blue cones) | #1D8795 | 0.121 |
| Achromatopsia (no color) | #797979 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B74CA
#5B74CA
oklch(58% 0.135 269.6)
- #967600
#967600
oklch(58% 0.119 89.7)
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 #5B74CA, 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 0.056
- Royal Blue #4169E1 ΔE 0.058
- French Blue #436BAD ΔE 0.059
- Cool Blue #4984B8 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.060
- Flat Blue #3C73A8 ΔE 0.065
- Slate Blue #6A5ACD ΔE 0.067
Use #5B74CA 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.