#577FCC
Closest named color: Cool Blue (#4984B8). oklch(60.3% 0.126 262.4), rgb(87, 127, 204).
Aa
Black text reads best on this color (5.31:1).
About this color
#577FCC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.126 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.040 away. Black text reads best on it, at 5.31:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.31:1 |
| White text | 3.95:1 |
Values
| HEX | #577FCC |
| RGB | rgb(87, 127, 204) |
| HSL | hsl(219, 53%, 57%) |
| OKLCH | oklch(60.3% 0.126 262.4) |
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 #577FCC | 3.95:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #577FCC | 5.31:1 | AA | Lc 37.4 | Non-text elements, placeholder text |
| #577FCC text on white | 3.95:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #577FCC text on black | 5.31:1 | AA | Lc -34.9 | 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 500.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#ABC1E9
oklch(80.8% 0.062 262.3)
-
Step 400
400
#7FA0DF
oklch(70.6% 0.1 262.8)
-
Step 500
500 (this color)
#577FCC
oklch(60.3% 0.126 262.4)
-
Step 600
600
#4670C3
oklch(55.6% 0.137 262.6)
-
Step 700
700
#375DA8
oklch(49% 0.128 262.4)
-
Step 800
800
#2E4D88
oklch(42.8% 0.105 262)
-
Step 900
900
#29406D
oklch(37.6% 0.083 262.6)
-
Step 950
950
#182640
oklch(27% 0.052 262)
#577FCC 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) | #5F86CF | 0.022 |
| Deuteranopia (no green cones) | #507BCA | 0.014 |
| Tritanopia (no blue cones) | #00909C | 0.112 |
| Achromatopsia (no color) | #808080 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577FCC
#577FCC
oklch(60.3% 0.126 262.4)
- #A57800
#A57800
oklch(60.2% 0.124 82.2)
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 #577FCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.040
- Windows Blue #3778BF ΔE 0.043
- Steel Blue #4682B4 ΔE 0.045
- Water Blue #0E87CC ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.049
- Soft Blue #6488EA ΔE 0.052
- Off Blue #5684AE ΔE 0.052
- Faded Blue #658CBB ΔE 0.053
Use #577FCC 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.