#5B77CF
Closest named color: Windows Blue (#3778BF). oklch(59% 0.138 268.6), rgb(91, 119, 207).
Aa
Black text reads best on this color (4.98:1).
About this color
#5B77CF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.138 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.045 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #5B77CF |
| RGB | rgb(91, 119, 207) |
| HSL | hsl(226, 55%, 58%) |
| OKLCH | oklch(59% 0.138 268.6) |
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 #5B77CF | 4.21:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #5B77CF | 4.98:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #5B77CF text on white | 4.21:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #5B77CF text on black | 4.98:1 | AA | Lc -32.8 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#B0C0EA
oklch(81% 0.062 268.6)
-
Step 400
400
#879EDF
oklch(70.7% 0.099 268.9)
-
Step 500
500
#6985D6
oklch(63.1% 0.126 268.2)
-
Step 600
600 (this color)
#5B77CF
oklch(59% 0.138 268.6)
-
Step 700
700
#425AA9
oklch(49% 0.129 268.6)
-
Step 800
800
#374A89
oklch(42.7% 0.107 268.9)
-
Step 900
900
#2F3E6E
oklch(37.6% 0.085 269)
-
Step 950
950
#1C2540
oklch(27.1% 0.052 268.8)
#5B77CF 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) | #5181D2 | 0.027 |
| Deuteranopia (no green cones) | #4277CD | 0.027 |
| Tritanopia (no blue cones) | #118A99 | 0.123 |
| Achromatopsia (no color) | #7B7B7B | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B77CF
#5B77CF
oklch(59% 0.138 268.6)
- #9A7800
#9A7800
oklch(58.9% 0.12 88.8)
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 #5B77CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.045
- Soft Blue #6488EA ΔE 0.058
- Cool Blue #4984B8 ΔE 0.058
- Royal Blue #4169E1 ΔE 0.058
- Steel Blue #4682B4 ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.061
- Water Blue #0E87CC ΔE 0.063
- Dark Sky Blue #448EE4 ΔE 0.064
Use #5B77CF 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.