#4283ED
Closest named color: Dark Sky Blue (#448EE4). oklch(62.2% 0.173 259.7), rgb(66, 131, 237).
Aa
Black text reads best on this color (5.70:1).
About this color
#4283ED is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.173 and its hue 260°. 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 5.70:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.70:1 |
| White text | 3.68:1 |
Values
| HEX | #4283ED |
| RGB | rgb(66, 131, 237) |
| HSL | hsl(217, 83%, 59%) |
| OKLCH | oklch(62.2% 0.173 259.7) |
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 #4283ED | 3.68:1 | AA large text | Lc -69.5 | Content text, not long reading |
| Black text on #4283ED | 5.70:1 | AA | Lc 40.0 | Non-text elements, placeholder text |
| #4283ED text on white | 3.68:1 | AA large text | Lc 64.0 | Content text, not long reading |
| #4283ED text on black | 5.70:1 | AA | Lc -37.6 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A1C2F8
oklch(80.9% 0.085 260.1)
-
Step 400
400
#6DA0F4
oklch(70.6% 0.135 260)
-
Step 500
500 (this color)
#4283ED
oklch(62.2% 0.173 259.7)
-
Step 600
600
#256DDF
oklch(55.7% 0.188 259.7)
-
Step 700
700
#175AC2
oklch(49.1% 0.176 259.7)
-
Step 800
800
#164A9C
oklch(42.6% 0.145 259.6)
-
Step 900
900
#193F7C
oklch(37.7% 0.112 259.6)
-
Step 950
950
#102549
oklch(26.9% 0.072 260.4)
#4283ED 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) | #4D8EF1 | 0.032 |
| Deuteranopia (no green cones) | #297EEB | 0.024 |
| Tritanopia (no blue cones) | #009CAC | 0.137 |
| Achromatopsia (no color) | #858585 | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4283ED
#4283ED
oklch(62.2% 0.173 259.7)
- #AF7C00
#AF7C00
oklch(62.1% 0.129 79.7)
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 #4283ED, 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 0.038
- Dodger Blue #1E90FF ΔE 0.040
- Clear Blue #247AFD ΔE 0.041
- Chefchaouen Blue #4895EF ΔE 0.049
- Cornflower #6A79F7 ΔE 0.049
- Water Blue #0E87CC ΔE 0.061
- Cornflower Blue #6495ED ΔE 0.062
Use #4283ED 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.