#4063DB
Closest named color: Royal Blue (#4169E1). oklch(54.3% 0.188 267.4), rgb(64, 99, 219).
Aa
White text reads best on this color (5.21:1).
About this color
#4063DB is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.188 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.017 away. White text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.188) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.02:1 |
| White text | 5.21:1 |
Values
| HEX | #4063DB |
| RGB | rgb(64, 99, 219) |
| HSL | hsl(226, 68%, 55%) |
| OKLCH | oklch(54.3% 0.188 267.4) |
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 #4063DB | 5.21:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #4063DB | 4.02:1 | AA large text | Lc 28.7 | Dividers and decoration only |
| #4063DB text on white | 5.21:1 | AA | Lc 75.4 | Fine for body text |
| #4063DB text on black | 4.02:1 | AA large text | Lc -26.3 | Dividers and decoration only |
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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CBD9F9
oklch(88.5% 0.047 266.7)
-
Step 300
300
#A9BFF8
oklch(80.8% 0.085 268.1)
-
Step 400
400
#7B9CF5
oklch(70.6% 0.136 267.5)
-
Step 500
500
#5B81F1
oklch(63.1% 0.173 267.2)
-
Step 600
600 (this color)
#4063DB
oklch(54.3% 0.188 267.4)
-
Step 700
700
#3655C2
oklch(49.2% 0.174 267.5)
-
Step 800
800
#2C469D
oklch(42.7% 0.145 267.3)
-
Step 900
900
#273C7D
oklch(37.7% 0.113 267.3)
-
Step 950
950
#172449
oklch(27.1% 0.071 267.1)
#4063DB 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) | #0074DF | 0.047 |
| Deuteranopia (no green cones) | #0066D9 | 0.035 |
| Tritanopia (no blue cones) | #008095 | 0.151 |
| Achromatopsia (no color) | #6C6C6C | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4063DB
#4063DB
oklch(54.3% 0.188 267.4)
- #8B6A00
#8B6A00
oklch(54.2% 0.111 87)
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 #4063DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.017
- Warm Blue #4B57DB ΔE 0.028
- Neon Blue #4361EE ΔE 0.030
- Azul #1D5DEC ΔE 0.042
- Cerulean Blue #056EEE ΔE 0.045
- Dark Periwinkle #665FD1 ΔE 0.049
- Iris #6258C4 ΔE 0.057
- Bright Blue #0165FC ΔE 0.058
Use #4063DB 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.