#558BB1
Closest named color: Dusty Blue (#5A86AD). oklch(61.5% 0.082 240.6), rgb(85, 139, 177).
Aa
Black text reads best on this color (5.71:1).
About this color
#558BB1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.082 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Blue (#5A86AD), ΔE 0.014 away. Black text reads best on it, at 5.71:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Dusty Blue (#5A86AD) |
| Black text | 5.71:1 |
| White text | 3.67:1 |
Values
| HEX | #558BB1 |
| RGB | rgb(85, 139, 177) |
| HSL | hsl(205, 37%, 51%) |
| OKLCH | oklch(61.5% 0.082 240.6) |
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 #558BB1 | 3.67:1 | AA large text | Lc -69.7 | Content text, not long reading |
| Black text on #558BB1 | 5.71:1 | AA | Lc 39.9 | Non-text elements, placeholder text |
| #558BB1 text on white | 3.67:1 | AA large text | Lc 64.2 | Content text, not long reading |
| #558BB1 text on black | 5.71:1 | AA | Lc -37.5 | 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
#AAC5D8
oklch(80.9% 0.04 238.7)
-
Step 400
400
#7DA6C5
oklch(70.7% 0.064 241.4)
-
Step 500
500 (this color)
#558BB1
oklch(61.5% 0.082 240.6)
-
Step 600
600
#3E7AA2
oklch(55.7% 0.088 240.1)
-
Step 700
700
#30668B
oklch(49% 0.083 241.2)
-
Step 800
800
#285471
oklch(42.8% 0.069 239.9)
-
Step 900
900
#26455B
oklch(37.7% 0.053 241)
-
Step 950
950
#172935
oklch(27.1% 0.033 238.8)
#558BB1 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) | #7A8BB3 | 0.044 |
| Deuteranopia (no green cones) | #6E81B0 | 0.037 |
| Tritanopia (no blue cones) | #229498 | 0.065 |
| Achromatopsia (no color) | #858585 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558BB1
#558BB1
oklch(61.5% 0.082 240.6)
- #A97951
#A97951
oklch(61.5% 0.082 60.3)
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 #558BB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Blue #5A86AD ΔE 0.014
- Off Blue #5684AE ΔE 0.019
- Faded Blue #658CBB ΔE 0.024
- Cool Blue #4984B8 ΔE 0.029
- Steel Blue #4682B4 ΔE 0.033
- Silver Lake Blue #778DA9 ΔE 0.042
- Blue Grey #758DA3 ΔE 0.043
- Blue NCS #118AB2 ΔE 0.043
Use #558BB1 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.