#4283BD
Closest named color: Cool Blue (#4984B8). oklch(59.3% 0.111 247.8), rgb(66, 131, 189).
Aa
Black text reads best on this color (5.21:1).
About this color
#4283BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.111 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.011 away. Black text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.21:1 |
| White text | 4.02:1 |
Values
| HEX | #4283BD |
| RGB | rgb(66, 131, 189) |
| HSL | hsl(208, 48%, 50%) |
| OKLCH | oklch(59.3% 0.111 247.8) |
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 #4283BD | 4.02:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #4283BD | 5.21:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #4283BD text on white | 4.02:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #4283BD text on black | 5.21:1 | AA | Lc -34.3 | 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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CBDBEB
oklch(88.4% 0.028 248.1)
-
Step 300
300
#A8C4E0
oklch(80.9% 0.05 248.4)
-
Step 400
400
#78A5D1
oklch(70.6% 0.081 248.5)
-
Step 500
500
#548EC4
oklch(63% 0.102 248.1)
-
Step 600
600 (this color)
#4283BD
oklch(59.3% 0.111 247.8)
-
Step 700
700
#286498
oklch(49% 0.104 248)
-
Step 800
800
#23527B
oklch(42.6% 0.085 247.7)
-
Step 900
900
#224463
oklch(37.6% 0.067 248)
-
Step 950
950
#15283A
oklch(27% 0.042 248.4)
#4283BD 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) | #6A85C0 | 0.044 |
| Deuteranopia (no green cones) | #5979BC | 0.033 |
| Tritanopia (no blue cones) | #009198 | 0.085 |
| Achromatopsia (no color) | #7F7F7F | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4283BD
#4283BD
oklch(59.3% 0.111 247.8)
- #A97029
#A97029
oklch(59.3% 0.111 68.1)
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 #4283BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.011
- Steel Blue #4682B4 ΔE 0.014
- Off Blue #5684AE ΔE 0.030
- Water Blue #0E87CC ΔE 0.032
- Windows Blue #3778BF ΔE 0.035
- Dusty Blue #5A86AD ΔE 0.036
- Blue NCS #118AB2 ΔE 0.038
- Nice Blue #107AB0 ΔE 0.046
Use #4283BD 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.