#558FDF
Closest named color: Dark Sky Blue (#448EE4). oklch(64.7% 0.135 256.8), rgb(85, 143, 223).
Aa
Black text reads best on this color (6.38:1).
About this color
#558FDF is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.135 and its hue 257°. 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 6.38:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.38:1 |
| White text | 3.29:1 |
Values
| HEX | #558FDF |
| RGB | rgb(85, 143, 223) |
| HSL | hsl(215, 68%, 60%) |
| OKLCH | oklch(64.7% 0.135 256.8) |
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 #558FDF | 3.29:1 | AA large text | Lc -65.5 | Content text, not long reading |
| Black text on #558FDF | 6.38:1 | AA | Lc 44.0 | Non-text elements, placeholder text |
| #558FDF text on white | 3.29:1 | AA large text | Lc 60.0 | Content text, not long reading |
| #558FDF text on black | 6.38:1 | AA | Lc -41.7 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADBF2
oklch(88.6% 0.037 256)
-
Step 300
300
#A6C3EC
oklch(81% 0.066 257)
-
Step 400
400
#75A3E2
oklch(70.8% 0.105 256.4)
-
Step 500
500 (this color)
#558FDF
oklch(64.7% 0.135 256.8)
-
Step 600
600
#3372C7
oklch(55.5% 0.147 256.9)
-
Step 700
700
#265FAC
oklch(49% 0.137 257.1)
-
Step 800
800
#214E8B
oklch(42.6% 0.113 256.9)
-
Step 900
900
#20426F
oklch(37.8% 0.087 256.2)
-
Step 950
950
#132741
oklch(27% 0.055 255.7)
#558FDF 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) | #6D95E2 | 0.032 |
| Deuteranopia (no green cones) | #5A88DD | 0.018 |
| Tritanopia (no blue cones) | #00A1AC | 0.112 |
| Achromatopsia (no color) | #8E8E8E | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558FDF
#558FDF
oklch(64.7% 0.135 256.8)
- #BC8101
#BC8101
oklch(64.7% 0.135 76.6)
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 #558FDF, 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
- Chefchaouen Blue #4895EF ΔE 0.026
- Cornflower Blue #6495ED ΔE 0.031
- Soft Blue #6488EA ΔE 0.031
- Faded Blue #658CBB ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.056
- Water Blue #0E87CC ΔE 0.059
- Cool Blue #4984B8 ΔE 0.064
Use #558FDF 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.