#558DB0
Closest named color: Dusty Blue (#5A86AD). oklch(61.9% 0.079 237.4), rgb(85, 141, 176).
Aa
Black text reads best on this color (5.82:1).
About this color
#558DB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.079 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.019 away. Black text reads best on it, at 5.82:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.82:1 |
| White text | 3.60:1 |
Values
| HEX | #558DB0 |
| RGB | rgb(85, 141, 176) |
| HSL | hsl(203, 37%, 51%) |
| OKLCH | oklch(61.9% 0.079 237.4) |
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 #558DB0 | 3.60:1 | AA large text | Lc -69.0 | Content text, not long reading |
| Black text on #558DB0 | 5.82:1 | AA | Lc 40.5 | Non-text elements, placeholder text |
| #558DB0 text on white | 3.60:1 | AA large text | Lc 63.5 | Content text, not long reading |
| #558DB0 text on black | 5.82:1 | AA | Lc -38.1 | 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
#CDDCE6
oklch(88.6% 0.021 236.8)
-
Step 300
300
#AAC5D7
oklch(80.9% 0.039 237.2)
-
Step 400
400
#7CA7C3
oklch(70.7% 0.062 237.3)
-
Step 500
500 (this color)
#558DB0
oklch(61.9% 0.079 237.4)
-
Step 600
600
#3C7AA0
oklch(55.5% 0.087 238)
-
Step 700
700
#2E6789
oklch(49.1% 0.081 237.7)
-
Step 800
800
#27546F
oklch(42.7% 0.067 237.5)
-
Step 900
900
#25465A
oklch(37.8% 0.052 236.9)
-
Step 950
950
#162935
oklch(27.1% 0.033 237.5)
#558DB0 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) | #7D8CB2 | 0.047 |
| Deuteranopia (no green cones) | #7183AF | 0.040 |
| Tritanopia (no blue cones) | #229699 | 0.062 |
| Achromatopsia (no color) | #878787 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558DB0
#558DB0
oklch(61.9% 0.079 237.4)
- #AA7A55
#AA7A55
oklch(61.9% 0.079 58.3)
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 #558DB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.019
- Off Blue #5684AE ΔE 0.025
- Faded Blue #658CBB ΔE 0.026
- Cool Blue #4984B8 ΔE 0.035
- Steel Blue #4682B4 ΔE 0.039
- Silver Lake Blue #778DA9 ΔE 0.040
- Blue Grey #758DA3 ΔE 0.040
- Blue NCS #118AB2 ΔE 0.045
Use #558DB0 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.