#558CD4
Closest named color: Dark Sky Blue (#448EE4). oklch(63.4% 0.124 255.7), rgb(85, 140, 212).
Aa
Black text reads best on this color (6.08:1).
About this color
#558CD4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.124 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.026 away. Black text reads best on it, at 6.08:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.08:1 |
| White text | 3.44:1 |
Values
| HEX | #558CD4 |
| RGB | rgb(85, 140, 212) |
| HSL | hsl(214, 60%, 58%) |
| OKLCH | oklch(63.4% 0.124 255.7) |
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 #558CD4 | 3.44:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #558CD4 | 6.08:1 | AA | Lc 42.2 | Non-text elements, placeholder text |
| #558CD4 text on white | 3.44:1 | AA large text | Lc 61.8 | Content text, not long reading |
| #558CD4 text on black | 6.08:1 | AA | Lc -39.9 | 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
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBF0
oklch(88.6% 0.034 255.2)
-
Step 300
300
#A7C3E8
oklch(80.9% 0.061 255.5)
-
Step 400
400
#78A3DC
oklch(70.7% 0.096 255.7)
-
Step 500
500 (this color)
#558CD4
oklch(63.4% 0.124 255.7)
-
Step 600
600
#3874C0
oklch(55.7% 0.134 255.6)
-
Step 700
700
#2A61A6
oklch(49.2% 0.125 255.6)
-
Step 800
800
#244F86
oklch(42.6% 0.103 255.8)
-
Step 900
900
#22426C
oklch(37.7% 0.082 256)
-
Step 950
950
#15273F
oklch(27% 0.051 256.1)
#558CD4 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) | #6E91D7 | 0.032 |
| Deuteranopia (no green cones) | #5D85D3 | 0.019 |
| Tritanopia (no blue cones) | #009CA6 | 0.104 |
| Achromatopsia (no color) | #8A8A8A | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558CD4
#558CD4
oklch(63.4% 0.124 255.7)
- #B57E1E
#B57E1E
oklch(63.4% 0.124 75.5)
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 #558CD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.026
- Faded Blue #658CBB ΔE 0.041
- Soft Blue #6488EA ΔE 0.041
- Chefchaouen Blue #4895EF ΔE 0.043
- Cornflower Blue #6495ED ΔE 0.046
- Cool Blue #4984B8 ΔE 0.048
- Water Blue #0E87CC ΔE 0.049
- Steel Blue #4682B4 ΔE 0.056
Use #558CD4 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.