#4091DC
Closest named color: Dark Sky Blue (#448EE4). oklch(64.1% 0.138 249.4), rgb(64, 145, 220).
Aa
Black text reads best on this color (6.30:1).
About this color
#4091DC is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.138 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.016 away. Black text reads best on it, at 6.30:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.30:1 |
| White text | 3.33:1 |
Values
| HEX | #4091DC |
| RGB | rgb(64, 145, 220) |
| HSL | hsl(209, 69%, 56%) |
| OKLCH | oklch(64.1% 0.138 249.4) |
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 #4091DC | 3.33:1 | AA large text | Lc -65.9 | Content text, not long reading |
| Black text on #4091DC | 6.30:1 | AA | Lc 43.6 | Non-text elements, placeholder text |
| #4091DC text on white | 3.33:1 | AA large text | Lc 60.4 | Content text, not long reading |
| #4091DC text on black | 6.30:1 | AA | Lc -41.3 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#A0C5EB
oklch(81% 0.067 249.3)
-
Step 400
400
#6AA6E1
oklch(70.8% 0.107 249.2)
-
Step 500
500 (this color)
#4091DC
oklch(64.1% 0.138 249.4)
-
Step 600
600
#0F76C6
oklch(55.5% 0.15 249.5)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#06518B
oklch(42.7% 0.116 249.5)
-
Step 900
900
#13446F
oklch(37.8% 0.09 249.2)
-
Step 950
950
#0D2841
oklch(27% 0.057 249.3)
#4091DC 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) | #6F95DF | 0.048 |
| Deuteranopia (no green cones) | #5986DB | 0.034 |
| Tritanopia (no blue cones) | #00A3AC | 0.104 |
| Achromatopsia (no color) | #8D8D8D | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4091DC
#4091DC
oklch(64.1% 0.138 249.4)
- #C17B08
#C17B08
oklch(64.2% 0.137 69.7)
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 #4091DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.016
- Chefchaouen Blue #4895EF ΔE 0.030
- Cornflower Blue #6495ED ΔE 0.044
- Water Blue #0E87CC ΔE 0.046
- Soft Blue #6488EA ΔE 0.047
- Dodger Blue #1E90FF ΔE 0.055
- Faded Blue #658CBB ΔE 0.056
- Cool Blue #4984B8 ΔE 0.058
Use #4091DC 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.