#5B71AC
Closest named color: Flat Blue (#3C73A8). oklch(55.7% 0.096 267.7), rgb(91, 113, 172).
Aa
White text reads best on this color (4.76:1).
About this color
#5B71AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.096 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.035 away. White text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.40:1 |
| White text | 4.76:1 |
Values
| HEX | #5B71AC |
| RGB | rgb(91, 113, 172) |
| HSL | hsl(224, 33%, 52%) |
| OKLCH | oklch(55.7% 0.096 267.7) |
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 #5B71AC | 4.76:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #5B71AC | 4.40:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #5B71AC text on white | 4.76:1 | AA | Lc 73.0 | Content text, not long reading |
| #5B71AC text on black | 4.40:1 | AA large text | Lc -28.7 | Dividers and decoration only |
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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B4C0DD
oklch(80.8% 0.043 267.6)
-
Step 400
400
#8EA0CC
oklch(70.8% 0.068 267.3)
-
Step 500
500
#7288BF
oklch(63.2% 0.087 267.2)
-
Step 600
600 (this color)
#5B71AC
oklch(55.7% 0.096 267.7)
-
Step 700
700
#4B5E93
oklch(49.1% 0.089 268.1)
-
Step 800
800
#3D4D78
oklch(42.7% 0.075 267.7)
-
Step 900
900
#344060
oklch(37.6% 0.057 267.9)
-
Step 950
950
#1F2638
oklch(27.1% 0.035 267.7)
#5B71AC 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) | #5B76AE | 0.014 |
| Deuteranopia (no green cones) | #536FAB | 0.012 |
| Tritanopia (no blue cones) | #3C7D86 | 0.086 |
| Achromatopsia (no color) | #737373 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B71AC
#5B71AC
oklch(55.7% 0.096 267.7)
- #8B7027
#8B7027
oklch(55.7% 0.096 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 #5B71AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.035
- French Blue #436BAD ΔE 0.035
- Dull Blue #49759C ΔE 0.038
- Muted Blue #3B719F ΔE 0.043
- Windows Blue #3778BF ΔE 0.045
- Stormy Blue #507B9C ΔE 0.045
- Cerulean #457B9D ΔE 0.048
- Steel Blue #4682B4 ΔE 0.049
Use #5B71AC 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.