#5B77BC
Closest named color: Windows Blue (#3778BF). oklch(57.9% 0.112 266.3), rgb(91, 119, 188).
Aa
Black text reads best on this color (4.80:1).
About this color
#5B77BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.112 and its hue 266°. 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 4.80:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.80:1 |
| White text | 4.36:1 |
Values
| HEX | #5B77BC |
| RGB | rgb(91, 119, 188) |
| HSL | hsl(223, 42%, 55%) |
| OKLCH | oklch(57.9% 0.112 266.3) |
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 #5B77BC | 4.36:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #5B77BC | 4.80:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #5B77BC text on white | 4.36:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #5B77BC text on black | 4.80:1 | AA | Lc -31.5 | 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
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B2C1E2
oklch(81% 0.05 266)
-
Step 400
400
#89A0D3
oklch(70.7% 0.079 265.6)
-
Step 500
500
#6C87C8
oklch(63% 0.103 266.3)
-
Step 600
600 (this color)
#5B77BC
oklch(57.9% 0.112 266.3)
-
Step 700
700
#455E9B
oklch(49.1% 0.103 265.9)
-
Step 800
800
#394D7E
oklch(42.8% 0.085 266.1)
-
Step 900
900
#314065
oklch(37.6% 0.067 266.5)
-
Step 950
950
#1D263B
oklch(27.1% 0.041 266)
#5B77BC 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) | #5C7EBF | 0.019 |
| Deuteranopia (no green cones) | #5175BA | 0.014 |
| Tritanopia (no blue cones) | #2E8690 | 0.101 |
| Achromatopsia (no color) | #797979 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B77BC
#5B77BC
oklch(57.9% 0.112 266.3)
- #977416
#977416
oklch(57.8% 0.112 86)
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 #5B77BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- Steel Blue #4682B4 ΔE 0.041
- Cool Blue #4984B8 ΔE 0.041
- Off Blue #5684AE ΔE 0.047
- Flat Blue #3C73A8 ΔE 0.049
- French Blue #436BAD ΔE 0.050
- Dusty Blue #5A86AD ΔE 0.054
- Dull Blue #49759C ΔE 0.056
Use #5B77BC 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.