#577AC6
Closest named color: Windows Blue (#3778BF). oklch(58.8% 0.124 264.3), rgb(87, 122, 198).
Aa
Black text reads best on this color (5.00:1).
About this color
#577AC6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.124 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.035 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #577AC6 |
| RGB | rgb(87, 122, 198) |
| HSL | hsl(221, 49%, 56%) |
| OKLCH | oklch(58.8% 0.124 264.3) |
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 #577AC6 | 4.19:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #577AC6 | 5.00:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #577AC6 text on white | 4.19:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #577AC6 text on black | 5.00:1 | AA | Lc -32.9 | 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
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CFD9EE
oklch(88.4% 0.031 265.3)
-
Step 300
300
#AFC1E5
oklch(80.9% 0.055 264.2)
-
Step 400
400
#85A0D9
oklch(70.7% 0.089 264.7)
-
Step 500
500
#6688CE
oklch(63.1% 0.113 263.8)
-
Step 600
600 (this color)
#577AC6
oklch(58.8% 0.124 264.3)
-
Step 700
700
#3F5EA2
oklch(49.2% 0.115 264.1)
-
Step 800
800
#344D83
oklch(42.8% 0.095 264.1)
-
Step 900
900
#2D4069
oklch(37.6% 0.075 264.3)
-
Step 950
950
#1B263D
oklch(27% 0.046 264.1)
#577AC6 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) | #5B81C9 | 0.020 |
| Deuteranopia (no green cones) | #4D77C4 | 0.015 |
| Tritanopia (no blue cones) | #0C8B96 | 0.112 |
| Achromatopsia (no color) | #7C7C7C | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577AC6
#577AC6
oklch(58.8% 0.124 264.3)
- #9E7500
#9E7500
oklch(58.7% 0.121 84)
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 #577AC6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.035
- Cool Blue #4984B8 ΔE 0.041
- Steel Blue #4682B4 ΔE 0.043
- Off Blue #5684AE ΔE 0.052
- Water Blue #0E87CC ΔE 0.053
- Dusty Blue #5A86AD ΔE 0.058
- Flat Blue #3C73A8 ΔE 0.059
- French Blue #436BAD ΔE 0.060
Use #577AC6 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.