#558BCF
Closest named color: Dark Sky Blue (#448EE4). oklch(62.9% 0.118 254.9), rgb(85, 139, 207).
Aa
Black text reads best on this color (5.98:1).
About this color
#558BCF is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.118 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.033 away. Black text reads best on it, at 5.98:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.98:1 |
| White text | 3.51:1 |
Values
| HEX | #558BCF |
| RGB | rgb(85, 139, 207) |
| HSL | hsl(213, 56%, 57%) |
| OKLCH | oklch(62.9% 0.118 254.9) |
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 #558BCF | 3.51:1 | AA large text | Lc -68.0 | Content text, not long reading |
| Black text on #558BCF | 5.98:1 | AA | Lc 41.6 | Non-text elements, placeholder text |
| #558BCF text on white | 3.51:1 | AA large text | Lc 62.5 | Content text, not long reading |
| #558BCF text on black | 5.98:1 | AA | Lc -39.2 | 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
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A8C3E6
oklch(80.9% 0.058 255)
-
Step 400
400
#79A3DA
oklch(70.7% 0.093 255.4)
-
Step 500
500 (this color)
#558BCF
oklch(62.9% 0.118 254.9)
-
Step 600
600
#3974BD
oklch(55.5% 0.13 255.1)
-
Step 700
700
#2C61A3
oklch(49.1% 0.12 255.3)
-
Step 800
800
#255084
oklch(42.8% 0.099 254.7)
-
Step 900
900
#23426A
oklch(37.6% 0.078 255.6)
-
Step 950
950
#15273E
oklch(27% 0.049 255.2)
#558BCF 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) | #6F8FD2 | 0.032 |
| Deuteranopia (no green cones) | #5F83CE | 0.023 |
| Tritanopia (no blue cones) | #009AA3 | 0.101 |
| Achromatopsia (no color) | #898989 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558BCF
#558BCF
oklch(62.9% 0.118 254.9)
- #B27D27
#B27D27
oklch(62.9% 0.118 74.8)
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 #558BCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.033
- Faded Blue #658CBB ΔE 0.035
- Cool Blue #4984B8 ΔE 0.040
- Water Blue #0E87CC ΔE 0.047
- Soft Blue #6488EA ΔE 0.047
- Steel Blue #4682B4 ΔE 0.049
- Chefchaouen Blue #4895EF ΔE 0.050
- Off Blue #5684AE ΔE 0.050
Use #558BCF 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.