#577FC1
Closest named color: Cool Blue (#4984B8). oklch(59.6% 0.111 260), rgb(87, 127, 193).
Aa
Black text reads best on this color (5.21:1).
About this color
#577FC1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.111 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.026 away. Black text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.21:1 |
| White text | 4.02:1 |
Values
| HEX | #577FC1 |
| RGB | rgb(87, 127, 193) |
| HSL | hsl(217, 46%, 55%) |
| OKLCH | oklch(59.6% 0.111 260) |
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 #577FC1 | 4.02:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #577FC1 | 5.21:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #577FC1 text on white | 4.02:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #577FC1 text on black | 5.21:1 | AA | Lc -34.2 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEE
oklch(88.5% 0.03 260.7)
-
Step 300
300
#ACC2E4
oklch(80.9% 0.054 259)
-
Step 400
400
#81A2D7
oklch(70.8% 0.086 259.7)
-
Step 500
500 (this color)
#577FC1
oklch(59.6% 0.111 260)
-
Step 600
600
#4872B9
oklch(55.5% 0.121 260.3)
-
Step 700
700
#3960A0
oklch(49.2% 0.112 259.8)
-
Step 800
800
#2F4E81
oklch(42.6% 0.093 259.9)
-
Step 900
900
#2A4168
oklch(37.6% 0.073 260.4)
-
Step 950
950
#19263D
oklch(26.9% 0.047 261.3)
#577FC1 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) | #6484C4 | 0.022 |
| Deuteranopia (no green cones) | #577AC0 | 0.014 |
| Tritanopia (no blue cones) | #168E97 | 0.100 |
| Achromatopsia (no color) | #7F7F7F | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577FC1
#577FC1
oklch(59.6% 0.111 260)
- #A27722
#A27722
oklch(59.8% 0.111 79.9)
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 #577FC1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.026
- Steel Blue #4682B4 ΔE 0.030
- Off Blue #5684AE ΔE 0.036
- Windows Blue #3778BF ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.041
- Faded Blue #658CBB ΔE 0.045
- Water Blue #0E87CC ΔE 0.048
- Stormy Blue #507B9C ΔE 0.058
Use #577FC1 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.