#558BE3
Closest named color: Dark Sky Blue (#448EE4). oklch(64% 0.145 259.7), rgb(85, 139, 227).
Aa
Black text reads best on this color (6.18:1).
About this color
#558BE3 is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.145 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.015 away. Black text reads best on it, at 6.18:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.18:1 |
| White text | 3.39:1 |
Values
| HEX | #558BE3 |
| RGB | rgb(85, 139, 227) |
| HSL | hsl(217, 72%, 61%) |
| OKLCH | oklch(64% 0.145 259.7) |
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 #558BE3 | 3.39:1 | AA large text | Lc -66.6 | Content text, not long reading |
| Black text on #558BE3 | 6.18:1 | AA | Lc 42.9 | Non-text elements, placeholder text |
| #558BE3 text on white | 3.39:1 | AA large text | Lc 61.2 | Content text, not long reading |
| #558BE3 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
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF4
oklch(88.4% 0.04 260.1)
-
Step 300
300
#A6C2EF
oklch(80.9% 0.071 259.8)
-
Step 400
400
#76A1E7
oklch(70.7% 0.113 259.8)
-
Step 500
500 (this color)
#558BE3
oklch(64% 0.145 259.7)
-
Step 600
600
#3670CE
oklch(55.6% 0.158 259.7)
-
Step 700
700
#295DB2
oklch(49.1% 0.146 259.8)
-
Step 800
800
#234D90
oklch(42.8% 0.12 259.4)
-
Step 900
900
#214073
oklch(37.6% 0.095 259.8)
-
Step 950
950
#142643
oklch(27% 0.059 259.5)
#558BE3 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) | #6493E7 | 0.028 |
| Deuteranopia (no green cones) | #5085E1 | 0.017 |
| Tritanopia (no blue cones) | #009FAC | 0.121 |
| Achromatopsia (no color) | #8B8B8B | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558BE3
#558BE3
oklch(64% 0.145 259.7)
- #B68100
#B68100
oklch(64% 0.133 79.6)
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 #558BE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.015
- Soft Blue #6488EA ΔE 0.021
- Chefchaouen Blue #4895EF ΔE 0.029
- Cornflower Blue #6495ED ΔE 0.035
- Dodger Blue #1E90FF ΔE 0.051
- Water Blue #0E87CC ΔE 0.059
- Cornflower #6A79F7 ΔE 0.061
- Faded Blue #658CBB ΔE 0.063
Use #558BE3 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.