#558ADB
Closest named color: Dark Sky Blue (#448EE4). oklch(63.4% 0.135 258.6), rgb(85, 138, 219).
Aa
Black text reads best on this color (6.04:1).
About this color
#558ADB is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.135 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.019 away. Black text reads best on it, at 6.04:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.04:1 |
| White text | 3.47:1 |
Values
| HEX | #558ADB |
| RGB | rgb(85, 138, 219) |
| HSL | hsl(216, 65%, 60%) |
| OKLCH | oklch(63.4% 0.135 258.6) |
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 #558ADB | 3.47:1 | AA large text | Lc -67.5 | Content text, not long reading |
| Black text on #558ADB | 6.04:1 | AA | Lc 42.0 | Non-text elements, placeholder text |
| #558ADB text on white | 3.47:1 | AA large text | Lc 62.1 | Content text, not long reading |
| #558ADB text on black | 6.04:1 | AA | Lc -39.6 | 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
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2EC
oklch(80.8% 0.067 259.1)
-
Step 400
400
#78A2E2
oklch(70.7% 0.105 258.6)
-
Step 500
500 (this color)
#558ADB
oklch(63.4% 0.135 258.6)
-
Step 600
600
#3871C8
oklch(55.5% 0.148 258.7)
-
Step 700
700
#2B5FAD
oklch(49.2% 0.137 258.5)
-
Step 800
800
#254E8C
oklch(42.8% 0.113 258.6)
-
Step 900
900
#224170
oklch(37.7% 0.089 258.5)
-
Step 950
950
#152641
oklch(26.9% 0.056 259.3)
#558ADB 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) | #6790DE | 0.027 |
| Deuteranopia (no green cones) | #5584D9 | 0.016 |
| Tritanopia (no blue cones) | #009CA8 | 0.113 |
| Achromatopsia (no color) | #8A8A8A | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558ADB
#558ADB
oklch(63.4% 0.135 258.6)
- #B57F00
#B57F00
oklch(63.4% 0.132 78.7)
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 #558ADB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.019
- Soft Blue #6488EA ΔE 0.030
- Chefchaouen Blue #4895EF ΔE 0.037
- Cornflower Blue #6495ED ΔE 0.042
- Water Blue #0E87CC ΔE 0.052
- Faded Blue #658CBB ΔE 0.052
- Cool Blue #4984B8 ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.060
Use #558ADB 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.