#558CDD
Closest named color: Dark Sky Blue (#448EE4). oklch(63.9% 0.136 258), rgb(85, 140, 221).
Aa
Black text reads best on this color (6.18:1).
About this color
#558CDD is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.136 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.017 away. Black text reads best on it, at 6.18:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.18:1 |
| White text | 3.39:1 |
Values
| HEX | #558CDD |
| RGB | rgb(85, 140, 221) |
| HSL | hsl(216, 67%, 60%) |
| OKLCH | oklch(63.9% 0.136 258) |
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 #558CDD | 3.39:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #558CDD | 6.18:1 | AA | Lc 42.8 | Non-text elements, placeholder text |
| #558CDD text on white | 3.39:1 | AA large text | Lc 61.2 | Content text, not long reading |
| #558CDD text on black | 6.18:1 | AA | Lc -40.5 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADAF2
oklch(88.4% 0.037 258.4)
-
Step 300
300
#A6C2EC
oklch(80.8% 0.067 258.4)
-
Step 400
400
#77A2E2
oklch(70.7% 0.105 258.1)
-
Step 500
500 (this color)
#558CDD
oklch(63.9% 0.136 258)
-
Step 600
600
#3672C8
oklch(55.7% 0.147 257.8)
-
Step 700
700
#295FAD
oklch(49.2% 0.137 258)
-
Step 800
800
#234E8C
oklch(42.8% 0.113 257.9)
-
Step 900
900
#214170
oklch(37.6% 0.089 258)
-
Step 950
950
#142641
oklch(26.8% 0.056 258.3)
#558CDD 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) | #6992E0 | 0.029 |
| Deuteranopia (no green cones) | #5785DB | 0.018 |
| Tritanopia (no blue cones) | #009EAA | 0.113 |
| Achromatopsia (no color) | #8B8B8B | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558CDD
#558CDD
oklch(63.9% 0.136 258)
- #B88000
#B88000
oklch(64% 0.133 77.9)
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 #558CDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.017
- Soft Blue #6488EA ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.032
- Cornflower Blue #6495ED ΔE 0.037
- Faded Blue #658CBB ΔE 0.053
- Water Blue #0E87CC ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.058
- Cool Blue #4984B8 ΔE 0.060
Use #558CDD 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.