#5577CF
Closest named color: Windows Blue (#3778BF). oklch(58.6% 0.14 266.3), rgb(85, 119, 207).
Aa
Black text reads best on this color (4.92:1).
About this color
#5577CF is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.140 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.040 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #5577CF |
| RGB | rgb(85, 119, 207) |
| HSL | hsl(223, 56%, 57%) |
| OKLCH | oklch(58.6% 0.14 266.3) |
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 #5577CF | 4.26:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #5577CF | 4.92:1 | AA | Lc 34.8 | Non-text elements, placeholder text |
| #5577CF text on white | 4.26:1 | AA large text | Lc 69.3 | Content text, not long reading |
| #5577CF text on black | 4.92:1 | AA | Lc -32.4 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#AEC0EA
oklch(80.8% 0.063 266.8)
-
Step 400
400
#839FE0
oklch(70.7% 0.101 266)
-
Step 500
500
#6586D8
oklch(63.2% 0.129 266.2)
-
Step 600
600 (this color)
#5577CF
oklch(58.6% 0.14 266.3)
-
Step 700
700
#3E5BAA
oklch(49% 0.131 266.5)
-
Step 800
800
#334B8A
oklch(42.7% 0.108 266.2)
-
Step 900
900
#2D3F6E
oklch(37.7% 0.084 266.6)
-
Step 950
950
#1A2541
oklch(27% 0.055 266.6)
#5577CF 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) | #5080D2 | 0.024 |
| Deuteranopia (no green cones) | #3F75CD | 0.024 |
| Tritanopia (no blue cones) | #008B99 | 0.124 |
| Achromatopsia (no color) | #7A7A7A | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5577CF
#5577CF
oklch(58.6% 0.14 266.3)
- #9B7600
#9B7600
oklch(58.6% 0.12 86.6)
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 #5577CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.040
- Royal Blue #4169E1 ΔE 0.055
- Cool Blue #4984B8 ΔE 0.057
- Water Blue #0E87CC ΔE 0.059
- Steel Blue #4682B4 ΔE 0.059
- Soft Blue #6488EA ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.063
Use #5577CF 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.