#558DDF
Closest named color: Dark Sky Blue (#448EE4). oklch(64.2% 0.137 257.9), rgb(85, 141, 223).
Aa
Black text reads best on this color (6.26:1).
About this color
#558DDF is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.137 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.015 away. Black text reads best on it, at 6.26:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.26:1 |
| White text | 3.35:1 |
Values
| HEX | #558DDF |
| RGB | rgb(85, 141, 223) |
| HSL | hsl(216, 68%, 60%) |
| OKLCH | oklch(64.2% 0.137 257.9) |
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 #558DDF | 3.35:1 | AA large text | Lc -66.2 | Content text, not long reading |
| Black text on #558DDF | 6.26:1 | AA | Lc 43.3 | Non-text elements, placeholder text |
| #558DDF text on white | 3.35:1 | AA large text | Lc 60.8 | Content text, not long reading |
| #558DDF text on black | 6.26:1 | AA | Lc -40.9 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADAF2
oklch(88.4% 0.037 258.4)
-
Step 300
300
#A6C3EC
oklch(81% 0.066 257)
-
Step 400
400
#76A2E3
oklch(70.7% 0.107 258)
-
Step 500
500 (this color)
#558DDF
oklch(64.2% 0.137 257.9)
-
Step 600
600
#3572C9
oklch(55.7% 0.149 257.7)
-
Step 700
700
#285FAE
oklch(49.2% 0.139 258)
-
Step 800
800
#224E8D
oklch(42.8% 0.115 257.8)
-
Step 900
900
#214170
oklch(37.6% 0.089 258)
-
Step 950
950
#142642
oklch(26.9% 0.058 258.9)
#558DDF 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) | #6A93E2 | 0.029 |
| Deuteranopia (no green cones) | #5786DD | 0.018 |
| Tritanopia (no blue cones) | #00A0AB | 0.116 |
| Achromatopsia (no color) | #8C8C8C | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558DDF
#558DDF
oklch(64.2% 0.137 257.9)
- #B98100
#B98100
oklch(64.3% 0.134 78.1)
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 #558DDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.015
- Soft Blue #6488EA ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.029
- Cornflower Blue #6495ED ΔE 0.034
- Dodger Blue #1E90FF ΔE 0.055
- Faded Blue #658CBB ΔE 0.056
- Water Blue #0E87CC ΔE 0.057
- Cool Blue #4984B8 ΔE 0.063
Use #558DDF 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.