#577FD3
Closest named color: Soft Blue (#6488EA). oklch(60.7% 0.136 263.6), rgb(87, 127, 211).
Aa
Black text reads best on this color (5.38:1).
About this color
#577FD3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.136 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.043 away. Black text reads best on it, at 5.38:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 5.38:1 |
| White text | 3.90:1 |
Values
| HEX | #577FD3 |
| RGB | rgb(87, 127, 211) |
| HSL | hsl(221, 58%, 58%) |
| OKLCH | oklch(60.7% 0.136 263.6) |
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 #577FD3 | 3.90:1 | AA large text | Lc -71.8 | Content text, not long reading |
| Black text on #577FD3 | 5.38:1 | AA | Lc 37.8 | Non-text elements, placeholder text |
| #577FD3 text on white | 3.90:1 | AA large text | Lc 66.3 | Content text, not long reading |
| #577FD3 text on black | 5.38:1 | AA | Lc -35.4 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF2
oklch(88.6% 0.036 262.8)
-
Step 300
300
#ABC1EC
oklch(80.9% 0.066 263.7)
-
Step 400
400
#7EA0E3
oklch(70.7% 0.106 263.3)
-
Step 500
500 (this color)
#577FD3
oklch(60.7% 0.136 263.6)
-
Step 600
600
#456FC9
oklch(55.7% 0.147 263.5)
-
Step 700
700
#375CAE
oklch(49.2% 0.138 263.8)
-
Step 800
800
#2D4C8D
oklch(42.8% 0.114 263.2)
-
Step 900
900
#284070
oklch(37.8% 0.088 262.8)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#577FD3 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) | #5B87D6 | 0.023 |
| Deuteranopia (no green cones) | #4A7CD1 | 0.017 |
| Tritanopia (no blue cones) | #00929F | 0.119 |
| Achromatopsia (no color) | #818181 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #577FD3
#577FD3
oklch(60.7% 0.136 263.6)
- #A57A00
#A57A00
oklch(60.6% 0.124 83.8)
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 #577FD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.044
- Windows Blue #3778BF ΔE 0.049
- Cool Blue #4984B8 ΔE 0.050
- Water Blue #0E87CC ΔE 0.051
- Steel Blue #4682B4 ΔE 0.055
- Faded Blue #658CBB ΔE 0.060
- Off Blue #5684AE ΔE 0.062
Use #577FD3 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.