#578FCB
Closest named color: Faded Blue (#658CBB). oklch(63.7% 0.109 251.4), rgb(87, 143, 203).
Aa
Black text reads best on this color (6.19:1).
About this color
#578FCB is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.109 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.026 away. Black text reads best on it, at 6.19:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.19:1 |
| White text | 3.38:1 |
Values
| HEX | #578FCB |
| RGB | rgb(87, 143, 203) |
| HSL | hsl(211, 53%, 57%) |
| OKLCH | oklch(63.7% 0.109 251.4) |
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 #578FCB | 3.38:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #578FCB | 6.19:1 | AA | Lc 42.9 | Non-text elements, placeholder text |
| #578FCB text on white | 3.38:1 | AA large text | Lc 61.2 | Content text, not long reading |
| #578FCB text on black | 6.19:1 | AA | Lc -40.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CBDBED
oklch(88.5% 0.03 251.3)
-
Step 300
300
#A8C4E3
oklch(81% 0.053 251.1)
-
Step 400
400
#79A4D4
oklch(70.6% 0.085 251.8)
-
Step 500
500 (this color)
#578FCB
oklch(63.7% 0.109 251.4)
-
Step 600
600
#3976B6
oklch(55.6% 0.118 251.7)
-
Step 700
700
#2B639C
oklch(49.1% 0.109 251.4)
-
Step 800
800
#25517F
oklch(42.7% 0.091 251.6)
-
Step 900
900
#234366
oklch(37.6% 0.071 252.1)
-
Step 950
950
#15283C
oklch(27.1% 0.045 250.9)
#578FCB 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) | #7692CE | 0.037 |
| Deuteranopia (no green cones) | #6786CA | 0.028 |
| Tritanopia (no blue cones) | #009DA4 | 0.093 |
| Achromatopsia (no color) | #8B8B8B | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #578FCB
#578FCB
oklch(63.7% 0.109 251.4)
- #B47F39
#B47F39
oklch(63.6% 0.108 71.1)
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 #578FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.026
- Dark Sky Blue #448EE4 ΔE 0.041
- Cool Blue #4984B8 ΔE 0.043
- Dusty Blue #5A86AD ΔE 0.047
- Off Blue #5684AE ΔE 0.048
- Steel Blue #4682B4 ΔE 0.051
- Chefchaouen Blue #4895EF ΔE 0.053
- Water Blue #0E87CC ΔE 0.054
Use #578FCB 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.