#4281DC
Closest named color: Dark Sky Blue (#448EE4). oklch(60.7% 0.153 257.8), rgb(66, 129, 220).
Aa
Black text reads best on this color (5.40:1).
About this color
#4281DC is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.153 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.036 away. Black text reads best on it, at 5.40:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.40:1 |
| White text | 3.88:1 |
Values
| HEX | #4281DC |
| RGB | rgb(66, 129, 220) |
| HSL | hsl(215, 69%, 56%) |
| OKLCH | oklch(60.7% 0.153 257.8) |
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 #4281DC | 3.88:1 | AA large text | Lc -71.5 | Content text, not long reading |
| Black text on #4281DC | 5.40:1 | AA | Lc 38.1 | Non-text elements, placeholder text |
| #4281DC text on white | 3.88:1 | AA large text | Lc 66.0 | Content text, not long reading |
| #4281DC text on black | 5.40:1 | AA | Lc -35.7 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A3C3F1
oklch(81% 0.074 257.4)
-
Step 400
400
#70A2EB
oklch(70.7% 0.12 257.8)
-
Step 500
500 (this color)
#4281DC
oklch(60.7% 0.153 257.8)
-
Step 600
600
#2A70D2
oklch(55.5% 0.166 257.8)
-
Step 700
700
#1D5DB6
oklch(49% 0.155 258)
-
Step 800
800
#1A4D93
oklch(42.7% 0.127 257.5)
-
Step 900
900
#1C4175
oklch(37.8% 0.099 257.5)
-
Step 950
950
#112645
oklch(27% 0.064 258.1)
#4281DC 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) | #5689E0 | 0.031 |
| Deuteranopia (no green cones) | #3C7BDA | 0.018 |
| Tritanopia (no blue cones) | #0096A4 | 0.120 |
| Achromatopsia (no color) | #818181 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4281DC
#4281DC
oklch(60.7% 0.153 257.8)
- #AB7700
#AB7700
oklch(60.7% 0.126 78.2)
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 #4281DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.036
- Water Blue #0E87CC ΔE 0.041
- Soft Blue #6488EA ΔE 0.046
- Windows Blue #3778BF ΔE 0.050
- Chefchaouen Blue #4895EF ΔE 0.058
- Cool Blue #4984B8 ΔE 0.058
- Clear Blue #247AFD ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.060
Use #4281DC 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.