#5B71BB
Closest named color: Windows Blue (#3778BF). oklch(56.5% 0.118 269.8), rgb(91, 113, 187).
Aa
White text reads best on this color (4.64:1).
About this color
#5B71BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.118 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.038 away. White text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.52:1 |
| White text | 4.64:1 |
Values
| HEX | #5B71BB |
| RGB | rgb(91, 113, 187) |
| HSL | hsl(226, 41%, 55%) |
| OKLCH | oklch(56.5% 0.118 269.8) |
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 #5B71BB | 4.64:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #5B71BB | 4.52:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #5B71BB text on white | 4.64:1 | AA | Lc 72.1 | Content text, not long reading |
| #5B71BB text on black | 4.52:1 | AA | Lc -29.6 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B3C0E4
oklch(81% 0.053 269.6)
-
Step 400
400
#8C9ED6
oklch(70.6% 0.085 270.4)
-
Step 500
500
#7086CB
oklch(63.2% 0.107 269.7)
-
Step 600
600 (this color)
#5B71BB
oklch(56.5% 0.118 269.8)
-
Step 700
700
#495C9E
oklch(49.1% 0.108 270)
-
Step 800
800
#3C4B80
oklch(42.6% 0.09 270.3)
-
Step 900
900
#333F67
oklch(37.7% 0.07 270.1)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#5B71BB 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) | #5479BE | 0.022 |
| Deuteranopia (no green cones) | #4971B9 | 0.022 |
| Tritanopia (no blue cones) | #30818D | 0.105 |
| Achromatopsia (no color) | #747474 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B71BB
#5B71BB
oklch(56.5% 0.118 269.8)
- #917200
#917200
oklch(56.6% 0.116 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 #5B71BB, closest first.
No curated palette has a color within ΔE 0.04 of #5B71BB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.038
- French Blue #436BAD ΔE 0.041
- Flat Blue #3C73A8 ΔE 0.048
- Steel Blue #4682B4 ΔE 0.054
- Cool Blue #4984B8 ΔE 0.055
- Dull Blue #49759C ΔE 0.058
- Muted Blue #3B719F ΔE 0.059
- Mid Blue #276AB3 ΔE 0.060
Use #5B71BB 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.