#5B71AB
Closest named color: Flat Blue (#3C73A8). oklch(55.6% 0.094 267.5), rgb(91, 113, 171).
Aa
White text reads best on this color (4.77:1).
About this color
#5B71AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.094 and its hue 267°. 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 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.39:1 |
| White text | 4.77:1 |
Values
| HEX | #5B71AB |
| RGB | rgb(91, 113, 171) |
| HSL | hsl(224, 32%, 51%) |
| OKLCH | oklch(55.6% 0.094 267.5) |
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 #5B71AB | 4.77:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #5B71AB | 4.39:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #5B71AB text on white | 4.77:1 | AA | Lc 73.1 | Content text, not long reading |
| #5B71AB text on black | 4.39:1 | AA large text | Lc -28.6 | 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
#D2D9E9
oklch(88.5% 0.023 266.9)
-
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)
#5B71AB
oklch(55.6% 0.094 267.5)
-
Step 700
700
#4B5E93
oklch(49.1% 0.089 268.1)
-
Step 800
800
#3D4D77
oklch(42.6% 0.073 267.4)
-
Step 900
900
#344060
oklch(37.6% 0.057 267.9)
-
Step 950
950
#1F2638
oklch(27.1% 0.035 267.7)
#5B71AB 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) | #5C76AD | 0.014 |
| Deuteranopia (no green cones) | #546FAA | 0.011 |
| Tritanopia (no blue cones) | #3C7D86 | 0.085 |
| Achromatopsia (no color) | #727272 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B71AB
#5B71AB
oklch(55.6% 0.094 267.5)
- #8B7029
#8B7029
oklch(55.8% 0.095 87.8)
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 #5B71AB, 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 0.036
- Dull Blue #49759C ΔE 0.036
- Muted Blue #3B719F ΔE 0.042
- Stormy Blue #507B9C ΔE 0.044
- Windows Blue #3778BF ΔE 0.045
- Cerulean #457B9D ΔE 0.047
- Steel Blue #4682B4 ΔE 0.049
Use #5B71AB 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.