#4281DF
Closest named color: Dark Sky Blue (#448EE4). oklch(60.8% 0.157 258.4), rgb(66, 129, 223).
Aa
Black text reads best on this color (5.43:1).
About this color
#4281DF is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.157 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.035 away. Black text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.43:1 |
| White text | 3.86:1 |
Values
| HEX | #4281DF |
| RGB | rgb(66, 129, 223) |
| HSL | hsl(216, 71%, 57%) |
| OKLCH | oklch(60.8% 0.157 258.4) |
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 #4281DF | 3.86:1 | AA large text | Lc -71.3 | Content text, not long reading |
| Black text on #4281DF | 5.43:1 | AA | Lc 38.3 | Non-text elements, placeholder text |
| #4281DF text on white | 3.86:1 | AA large text | Lc 65.8 | Content text, not long reading |
| #4281DF text on black | 5.43:1 | AA | Lc -35.9 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF6
oklch(88.6% 0.043 257.1)
-
Step 300
300
#A2C2F3
oklch(80.8% 0.078 258.8)
-
Step 400
400
#70A2ED
oklch(70.8% 0.123 258.3)
-
Step 500
500 (this color)
#4281DF
oklch(60.8% 0.157 258.4)
-
Step 600
600
#2A70D5
oklch(55.7% 0.17 258.3)
-
Step 700
700
#1C5DB8
oklch(49.1% 0.158 258.1)
-
Step 800
800
#1A4C95
oklch(42.6% 0.131 258.4)
-
Step 900
900
#1B4077
oklch(37.6% 0.103 258.4)
-
Step 950
950
#112646
oklch(27% 0.066 258.6)
#4281DF 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) | #5489E3 | 0.029 |
| Deuteranopia (no green cones) | #397BDD | 0.019 |
| Tritanopia (no blue cones) | #0097A5 | 0.124 |
| Achromatopsia (no color) | #828282 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4281DF
#4281DF
oklch(60.8% 0.157 258.4)
- #AB7800
#AB7800
oklch(60.9% 0.127 78.9)
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 #4281DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.035
- Soft Blue #6488EA ΔE 0.044
- Water Blue #0E87CC ΔE 0.045
- Windows Blue #3778BF ΔE 0.054
- Clear Blue #247AFD ΔE 0.054
- Chefchaouen Blue #4895EF ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.057
- Cornflower #6A79F7 ΔE 0.060
Use #4281DF 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.