#577EC4
Closest named color: Cool Blue (#4984B8). oklch(59.6% 0.116 261.4), rgb(87, 126, 196).
Aa
Black text reads best on this color (5.18:1).
About this color
#577EC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.116 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.031 away. Black text reads best on it, at 5.18:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.18:1 |
| White text | 4.04:1 |
Values
| HEX | #577EC4 |
| RGB | rgb(87, 126, 196) |
| HSL | hsl(219, 48%, 55%) |
| OKLCH | oklch(59.6% 0.116 261.4) |
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 #577EC4 | 4.04:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #577EC4 | 5.18:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #577EC4 text on white | 4.04:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #577EC4 text on black | 5.18:1 | AA | Lc -34.1 | 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 500.
-
Step 50
50
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEF
oklch(88.6% 0.032 261.7)
-
Step 300
300
#ACC2E6
oklch(81% 0.056 260.2)
-
Step 400
400
#81A1DA
oklch(70.7% 0.091 261.7)
-
Step 500
500 (this color)
#577EC4
oklch(59.6% 0.116 261.4)
-
Step 600
600
#4871BD
oklch(55.5% 0.127 261.7)
-
Step 700
700
#395FA3
oklch(49.2% 0.118 261.1)
-
Step 800
800
#304E84
oklch(42.8% 0.097 261.3)
-
Step 900
900
#2A416A
oklch(37.7% 0.076 261.3)
-
Step 950
950
#19263E
oklch(27% 0.049 262)
#577EC4 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) | #6284C7 | 0.022 |
| Deuteranopia (no green cones) | #547AC3 | 0.012 |
| Tritanopia (no blue cones) | #0F8D98 | 0.103 |
| Achromatopsia (no color) | #7E7E7E | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577EC4
#577EC4
oklch(59.6% 0.116 261.4)
- #A27716
#A27716
oklch(59.7% 0.117 81.6)
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 #577EC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.035
- Windows Blue #3778BF ΔE 0.038
- Off Blue #5684AE ΔE 0.042
- Dusty Blue #5A86AD ΔE 0.047
- Water Blue #0E87CC ΔE 0.048
- Faded Blue #658CBB ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.058
Use #577EC4 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.