#5577BC
Closest named color: Windows Blue (#3778BF). oklch(57.5% 0.114 263.4), rgb(85, 119, 188).
Aa
Black text reads best on this color (4.75:1).
About this color
#5577BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.114 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.029 away. Black text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.75:1 |
| White text | 4.41:1 |
Values
| HEX | #5577BC |
| RGB | rgb(85, 119, 188) |
| HSL | hsl(220, 43%, 54%) |
| OKLCH | oklch(57.5% 0.114 263.4) |
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 #5577BC | 4.41:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #5577BC | 4.75:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #5577BC text on white | 4.41:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #5577BC text on black | 4.75:1 | AA | Lc -31.2 | 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
#CFDAED
oklch(88.6% 0.029 261.5)
-
Step 300
300
#B0C1E3
oklch(80.9% 0.052 264.2)
-
Step 400
400
#86A1D4
oklch(70.8% 0.081 262.8)
-
Step 500
500
#6888C9
oklch(63% 0.105 263.7)
-
Step 600
600 (this color)
#5577BC
oklch(57.5% 0.114 263.4)
-
Step 700
700
#405F9D
oklch(49.2% 0.106 263)
-
Step 800
800
#354D7F
oklch(42.6% 0.089 263.7)
-
Step 900
900
#2E4166
oklch(37.7% 0.068 262.8)
-
Step 950
950
#1B263C
oklch(27% 0.044 263.4)
#5577BC 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) | #5B7DBF | 0.019 |
| Deuteranopia (no green cones) | #4F74BB | 0.012 |
| Tritanopia (no blue cones) | #198690 | 0.103 |
| Achromatopsia (no color) | #787878 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5577BC
#5577BC
oklch(57.5% 0.114 263.4)
- #99720F
#99720F
oklch(57.6% 0.114 83.7)
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 #5577BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.029
- Steel Blue #4682B4 ΔE 0.038
- Cool Blue #4984B8 ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.044
- French Blue #436BAD ΔE 0.046
- Off Blue #5684AE ΔE 0.048
- Dull Blue #49759C ΔE 0.053
- Dusty Blue #5A86AD ΔE 0.055
Use #5577BC 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.