#558EC9
Closest named color: Faded Blue (#658CBB). oklch(63.3% 0.108 250.6), rgb(85, 142, 201).
Aa
Black text reads best on this color (6.09:1).
About this color
#558EC9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.108 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.025 away. Black text reads best on it, at 6.09:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.09:1 |
| White text | 3.44:1 |
Values
| HEX | #558EC9 |
| RGB | rgb(85, 142, 201) |
| HSL | hsl(211, 52%, 56%) |
| OKLCH | oklch(63.3% 0.108 250.6) |
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 #558EC9 | 3.44:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #558EC9 | 6.09:1 | AA | Lc 42.3 | Non-text elements, placeholder text |
| #558EC9 text on white | 3.44:1 | AA large text | Lc 61.8 | Content text, not long reading |
| #558EC9 text on black | 6.09:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CBDBEC
oklch(88.5% 0.029 249.8)
-
Step 300
300
#A8C4E2
oklch(81% 0.052 250.3)
-
Step 400
400
#78A5D4
oklch(70.8% 0.085 250.2)
-
Step 500
500 (this color)
#558EC9
oklch(63.3% 0.108 250.6)
-
Step 600
600
#3877B5
oklch(55.7% 0.116 250.4)
-
Step 700
700
#2A639C
oklch(49% 0.109 251.1)
-
Step 800
800
#24517E
oklch(42.6% 0.09 250.8)
-
Step 900
900
#224466
oklch(37.8% 0.071 250.2)
-
Step 950
950
#15283B
oklch(27.1% 0.044 249.7)
#558EC9 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) | #7591CC | 0.038 |
| Deuteranopia (no green cones) | #6685C8 | 0.028 |
| Tritanopia (no blue cones) | #009CA3 | 0.091 |
| Achromatopsia (no color) | #8A8A8A | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558EC9
#558EC9
oklch(63.3% 0.108 250.6)
- #B37E39
#B37E39
oklch(63.3% 0.107 70.7)
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 #558EC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.025
- Cool Blue #4984B8 ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.043
- Dusty Blue #5A86AD ΔE 0.043
- Off Blue #5684AE ΔE 0.044
- Steel Blue #4682B4 ΔE 0.047
- Water Blue #0E87CC ΔE 0.050
- Chefchaouen Blue #4895EF ΔE 0.056
Use #558EC9 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.