#578BDE
Closest named color: Dark Sky Blue (#448EE4). oklch(63.9% 0.137 259.4), rgb(87, 139, 222).
Aa
Black text reads best on this color (6.15:1).
About this color
#578BDE is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.137 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.018 away. Black text reads best on it, at 6.15:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.15:1 |
| White text | 3.41:1 |
Values
| HEX | #578BDE |
| RGB | rgb(87, 139, 222) |
| HSL | hsl(217, 67%, 61%) |
| OKLCH | oklch(63.9% 0.137 259.4) |
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 #578BDE | 3.41:1 | AA large text | Lc -66.9 | Content text, not long reading |
| Black text on #578BDE | 6.15:1 | AA | Lc 42.7 | Non-text elements, placeholder text |
| #578BDE text on white | 3.41:1 | AA large text | Lc 61.4 | Content text, not long reading |
| #578BDE text on black | 6.15:1 | AA | Lc -40.3 | 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
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2ED
oklch(80.9% 0.068 259.6)
-
Step 400
400
#78A1E3
oklch(70.6% 0.107 259.7)
-
Step 500
500 (this color)
#578BDE
oklch(63.9% 0.137 259.4)
-
Step 600
600
#3971C9
oklch(55.6% 0.149 259.2)
-
Step 700
700
#2C5EAE
oklch(49.1% 0.139 259.5)
-
Step 800
800
#254D8D
oklch(42.7% 0.115 259.4)
-
Step 900
900
#234170
oklch(37.7% 0.088 259.1)
-
Step 950
950
#152642
oklch(27% 0.057 259.9)
#578BDE 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) | #6792E1 | 0.027 |
| Deuteranopia (no green cones) | #5585DC | 0.016 |
| Tritanopia (no blue cones) | #009EAA | 0.116 |
| Achromatopsia (no color) | #8B8B8B | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #578BDE
#578BDE
oklch(63.9% 0.137 259.4)
- #B68100
#B68100
oklch(64% 0.133 79.6)
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 #578BDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.018
- Soft Blue #6488EA ΔE 0.025
- Chefchaouen Blue #4895EF ΔE 0.033
- Cornflower Blue #6495ED ΔE 0.037
- Faded Blue #658CBB ΔE 0.055
- Water Blue #0E87CC ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.057
- Cool Blue #4984B8 ΔE 0.061
Use #578BDE 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.