#558BB4
Closest named color: Dusty Blue (#5A86AD). oklch(61.6% 0.085 242.6), rgb(85, 139, 180).
Aa
Black text reads best on this color (5.73:1).
About this color
#558BB4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.085 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.015 away. Black text reads best on it, at 5.73:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.73:1 |
| White text | 3.65:1 |
Values
| HEX | #558BB4 |
| RGB | rgb(85, 139, 180) |
| HSL | hsl(206, 39%, 52%) |
| OKLCH | oklch(61.6% 0.085 242.6) |
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 #558BB4 | 3.65:1 | AA large text | Lc -69.6 | Content text, not long reading |
| Black text on #558BB4 | 5.73:1 | AA | Lc 40.0 | Non-text elements, placeholder text |
| #558BB4 text on white | 3.65:1 | AA large text | Lc 64.1 | Content text, not long reading |
| #558BB4 text on black | 5.73:1 | AA | Lc -37.6 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE7
oklch(88.4% 0.022 243.8)
-
Step 300
300
#AAC4DA
oklch(80.8% 0.042 243.8)
-
Step 400
400
#7CA6C7
oklch(70.7% 0.067 242.5)
-
Step 500
500 (this color)
#558BB4
oklch(61.6% 0.085 242.6)
-
Step 600
600
#3E79A5
oklch(55.6% 0.092 243.1)
-
Step 700
700
#2F668D
oklch(49.1% 0.085 242.2)
-
Step 800
800
#285373
oklch(42.7% 0.072 243.1)
-
Step 900
900
#25455D
oklch(37.7% 0.056 242.6)
-
Step 950
950
#162836
oklch(26.8% 0.035 243.1)
#558BB4 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) | #798BB6 | 0.043 |
| Deuteranopia (no green cones) | #6D81B3 | 0.037 |
| Tritanopia (no blue cones) | #1E9599 | 0.070 |
| Achromatopsia (no color) | #868686 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558BB4
#558BB4
oklch(61.6% 0.085 242.6)
- #AA794D
#AA794D
oklch(61.6% 0.086 62.1)
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 #558BB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.015
- Off Blue #5684AE ΔE 0.020
- Faded Blue #658CBB ΔE 0.022
- Cool Blue #4984B8 ΔE 0.027
- Steel Blue #4682B4 ΔE 0.032
- Silver Lake Blue #778DA9 ΔE 0.043
- Blue NCS #118AB2 ΔE 0.044
- Blue Grey #758DA3 ΔE 0.045
Use #558BB4 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.