#5B71BF
Closest named color: Windows Blue (#3778BF). oklch(56.8% 0.123 270.2), rgb(91, 113, 191).
Aa
White text reads best on this color (4.60:1).
About this color
#5B71BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.123 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.039 away. White text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.55:1 |
| White text | 4.60:1 |
Values
| HEX | #5B71BF |
| RGB | rgb(91, 113, 191) |
| HSL | hsl(227, 44%, 55%) |
| OKLCH | oklch(56.8% 0.123 270.2) |
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 #5B71BF | 4.60:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #5B71BF | 4.55:1 | AA | Lc 32.2 | Non-text elements, placeholder text |
| #5B71BF text on white | 4.60:1 | AA | Lc 71.8 | Content text, not long reading |
| #5B71BF text on black | 4.55:1 | AA | Lc -29.8 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EE
oklch(88.6% 0.03 269.1)
-
Step 300
300
#B3C0E5
oklch(81% 0.054 269.9)
-
Step 400
400
#8B9ED9
oklch(70.7% 0.089 270.3)
-
Step 500
500
#6F85CE
oklch(63.1% 0.113 270.2)
-
Step 600
600 (this color)
#5B71BF
oklch(56.8% 0.123 270.2)
-
Step 700
700
#485BA1
oklch(49% 0.114 270.3)
-
Step 800
800
#3B4B83
oklch(42.8% 0.095 270)
-
Step 900
900
#323F69
oklch(37.7% 0.074 269.6)
-
Step 950
950
#1E253D
oklch(27% 0.046 270.7)
#5B71BF 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) | #517AC2 | 0.025 |
| Deuteranopia (no green cones) | #4671BD | 0.025 |
| Tritanopia (no blue cones) | #2C828F | 0.110 |
| Achromatopsia (no color) | #757575 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B71BF
#5B71BF
oklch(56.8% 0.123 270.2)
- #917300
#917300
oklch(56.8% 0.116 90.5)
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 #5B71BF, closest first.
No curated palette has a color within ΔE 0.04 of #5B71BF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.039
- French Blue #436BAD ΔE 0.044
- Flat Blue #3C73A8 ΔE 0.052
- Steel Blue #4682B4 ΔE 0.057
- Cool Blue #4984B8 ΔE 0.058
- Dark Periwinkle #665FD1 ΔE 0.058
- Mid Blue #276AB3 ΔE 0.061
- Dull Blue #49759C ΔE 0.064
Use #5B71BF 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.