#558FCB
Closest named color: Faded Blue (#658CBB). oklch(63.6% 0.109 250.7), rgb(85, 143, 203).
Aa
Black text reads best on this color (6.17:1).
About this color
#558FCB is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.109 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.027 away. Black text reads best on it, at 6.17:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.17:1 |
| White text | 3.39:1 |
Values
| HEX | #558FCB |
| RGB | rgb(85, 143, 203) |
| HSL | hsl(211, 53%, 56%) |
| OKLCH | oklch(63.6% 0.109 250.7) |
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 #558FCB | 3.39:1 | AA large text | Lc -66.8 | Content text, not long reading |
| Black text on #558FCB | 6.17:1 | AA | Lc 42.8 | Non-text elements, placeholder text |
| #558FCB text on white | 3.39:1 | AA large text | Lc 61.3 | Content text, not long reading |
| #558FCB text on black | 6.17:1 | AA | Lc -40.4 | 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
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CBDBED
oklch(88.5% 0.03 251.3)
-
Step 300
300
#A7C4E3
oklch(80.9% 0.054 250.2)
-
Step 400
400
#78A5D5
oklch(70.8% 0.086 250.7)
-
Step 500
500 (this color)
#558FCB
oklch(63.6% 0.109 250.7)
-
Step 600
600
#3676B6
oklch(55.5% 0.12 250.9)
-
Step 700
700
#28639D
oklch(49% 0.111 250.9)
-
Step 800
800
#23517F
oklch(42.6% 0.092 250.9)
-
Step 900
900
#224466
oklch(37.8% 0.071 250.2)
-
Step 950
950
#15283C
oklch(27.1% 0.045 250.9)
#558FCB 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) | #7692CE | 0.039 |
| Deuteranopia (no green cones) | #6686CA | 0.028 |
| Tritanopia (no blue cones) | #009DA4 | 0.092 |
| Achromatopsia (no color) | #8B8B8B | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558FCB
#558FCB
oklch(63.6% 0.109 250.7)
- #B57F38
#B57F38
oklch(63.8% 0.11 70.8)
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 #558FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.027
- Dark Sky Blue #448EE4 ΔE 0.040
- Cool Blue #4984B8 ΔE 0.042
- Dusty Blue #5A86AD ΔE 0.046
- Off Blue #5684AE ΔE 0.048
- Steel Blue #4682B4 ΔE 0.050
- Water Blue #0E87CC ΔE 0.052
- Chefchaouen Blue #4895EF ΔE 0.053
Use #558FCB 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.