#5B74BC
Closest named color: Windows Blue (#3778BF). oklch(57.2% 0.115 268.2), rgb(91, 116, 188).
Aa
Black text reads best on this color (4.66:1).
About this color
#5B74BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.115 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. Black text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.66:1 |
| White text | 4.49:1 |
Values
| HEX | #5B74BC |
| RGB | rgb(91, 116, 188) |
| HSL | hsl(225, 42%, 55%) |
| OKLCH | oklch(57.2% 0.115 268.2) |
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 #5B74BC | 4.49:1 | AA large text | Lc -76.6 | Fine for body text |
| Black text on #5B74BC | 4.66:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #5B74BC text on white | 4.49:1 | AA large text | Lc 71.1 | Content text, not long reading |
| #5B74BC text on black | 4.66:1 | AA | Lc -30.6 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B2C0E3
oklch(80.9% 0.052 268)
-
Step 400
400
#8A9FD5
oklch(70.7% 0.083 267.8)
-
Step 500
500
#6E86CA
oklch(63% 0.107 268.5)
-
Step 600
600 (this color)
#5B74BC
oklch(57.2% 0.115 268.2)
-
Step 700
700
#475D9D
oklch(49.2% 0.106 268)
-
Step 800
800
#3A4C80
oklch(42.7% 0.089 268.1)
-
Step 900
900
#324066
oklch(37.8% 0.068 267.7)
-
Step 950
950
#1D253C
oklch(26.9% 0.045 268.7)
#5B74BC 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) | #587BBF | 0.019 |
| Deuteranopia (no green cones) | #4D73BA | 0.017 |
| Tritanopia (no blue cones) | #2F838F | 0.102 |
| Achromatopsia (no color) | #777777 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B74BC
#5B74BC
oklch(57.2% 0.115 268.2)
- #947306
#947306
oklch(57.2% 0.115 88.2)
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 #5B74BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- French Blue #436BAD ΔE 0.045
- Steel Blue #4682B4 ΔE 0.047
- Flat Blue #3C73A8 ΔE 0.048
- Cool Blue #4984B8 ΔE 0.048
- Off Blue #5684AE ΔE 0.055
- Dull Blue #49759C ΔE 0.057
- Muted Blue #3B719F ΔE 0.060
Use #5B74BC 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.