#4291DC
Closest named color: Dark Sky Blue (#448EE4). oklch(64.2% 0.137 249.8), rgb(66, 145, 220).
Aa
Black text reads best on this color (6.31:1).
About this color
#4291DC is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.137 and its hue 250°. 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 6.31:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.31:1 |
| White text | 3.32:1 |
Values
| HEX | #4291DC |
| RGB | rgb(66, 145, 220) |
| HSL | hsl(209, 69%, 56%) |
| OKLCH | oklch(64.2% 0.137 249.8) |
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 #4291DC | 3.32:1 | AA large text | Lc -65.8 | Content text, not long reading |
| Black text on #4291DC | 6.31:1 | AA | Lc 43.7 | Non-text elements, placeholder text |
| #4291DC text on white | 3.32:1 | AA large text | Lc 60.4 | Content text, not long reading |
| #4291DC text on black | 6.31:1 | AA | Lc -41.4 | 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
#6BA5E1
oklch(70.6% 0.107 250.3)
-
Step 500
500 (this color)
#4291DC
oklch(64.2% 0.137 249.8)
-
Step 600
600
#1476C6
oklch(55.6% 0.149 249.9)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#0A518A
oklch(42.7% 0.114 249.6)
-
Step 900
900
#14446F
oklch(37.8% 0.089 249.5)
-
Step 950
950
#0E2841
oklch(27.1% 0.057 249.9)
#4291DC 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 | 0.047 |
| Deuteranopia (no green cones) | #5986DB | 0.033 |
| Tritanopia (no blue cones) | #00A3AC | 0.104 |
| Achromatopsia (no color) | #8D8D8D | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4291DC
#4291DC
oklch(64.2% 0.137 249.8)
- #C17B0A
#C17B0A
oklch(64.2% 0.137 69.5)
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 #4291DC, 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 0.043
- Soft Blue #6488EA ΔE 0.046
- Water Blue #0E87CC ΔE 0.047
- Faded Blue #658CBB ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.055
- Cool Blue #4984B8 ΔE 0.058
Use #4291DC 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.