#577DC1
Closest named color: Cool Blue (#4984B8). oklch(59.2% 0.113 261.4), rgb(87, 125, 193).
Aa
Black text reads best on this color (5.10:1).
About this color
#577DC1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.113 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.030 away. Black text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #577DC1 |
| RGB | rgb(87, 125, 193) |
| HSL | hsl(218, 46%, 55%) |
| OKLCH | oklch(59.2% 0.113 261.4) |
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 #577DC1 | 4.11:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #577DC1 | 5.10:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #577DC1 text on white | 4.11:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #577DC1 text on black | 5.10:1 | AA | Lc -33.6 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CFDAEC
oklch(88.5% 0.028 260.3)
-
Step 300
300
#AFC2E2
oklch(81% 0.05 260.9)
-
Step 400
400
#84A1D4
oklch(70.6% 0.082 261.5)
-
Step 500
500
#6689C9
oklch(63.1% 0.105 261.9)
-
Step 600
600 (this color)
#577DC1
oklch(59.2% 0.113 261.4)
-
Step 700
700
#3E5F9C
oklch(49% 0.106 261.8)
-
Step 800
800
#334E7E
oklch(42.6% 0.087 261.2)
-
Step 900
900
#2D4166
oklch(37.7% 0.069 262)
-
Step 950
950
#1A263B
oklch(26.8% 0.043 261.2)
#577DC1 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) | #6282C4 | 0.020 |
| Deuteranopia (no green cones) | #5579C0 | 0.012 |
| Tritanopia (no blue cones) | #178C96 | 0.101 |
| Achromatopsia (no color) | #7D7D7D | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577DC1
#577DC1
oklch(59.2% 0.113 261.4)
- #A0761B
#A0761B
oklch(59.3% 0.113 81.4)
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 #577DC1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.030
- Steel Blue #4682B4 ΔE 0.032
- Windows Blue #3778BF ΔE 0.036
- Off Blue #5684AE ΔE 0.040
- Dusty Blue #5A86AD ΔE 0.045
- Water Blue #0E87CC ΔE 0.050
- Faded Blue #658CBB ΔE 0.050
- Flat Blue #3C73A8 ΔE 0.056
Use #577DC1 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.