#3E66CF
Closest named color: Royal Blue (#4169E1). oklch(53.9% 0.169 265.4), rgb(62, 102, 207).
Aa
White text reads best on this color (5.24:1).
About this color
#3E66CF is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.169 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.029 away. White text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #3E66CF |
| RGB | rgb(62, 102, 207) |
| HSL | hsl(223, 60%, 53%) |
| OKLCH | oklch(53.9% 0.169 265.4) |
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 #3E66CF | 5.24:1 | AA | Lc -81.0 | Fine for body text |
| Black text on #3E66CF | 4.00:1 | AA large text | Lc 28.4 | Dividers and decoration only |
| #3E66CF text on white | 5.24:1 | AA | Lc 75.6 | Fine for body text |
| #3E66CF text on black | 4.00:1 | AA large text | Lc -26.1 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#A9C0F3
oklch(80.8% 0.077 265.8)
-
Step 400
400
#7C9EEC
oklch(70.6% 0.121 265.5)
-
Step 500
500
#5B84E7
oklch(63.1% 0.156 265.3)
-
Step 600
600 (this color)
#3E66CF
oklch(53.9% 0.169 265.4)
-
Step 700
700
#3559B8
oklch(49.1% 0.156 265.4)
-
Step 800
800
#2C4995
oklch(42.7% 0.13 265.5)
-
Step 900
900
#273E77
oklch(37.7% 0.101 265.3)
-
Step 950
950
#172546
oklch(27.1% 0.064 265.1)
#3E66CF 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) | #2673D3 | 0.035 |
| Deuteranopia (no green cones) | #0066CD | 0.034 |
| Tritanopia (no blue cones) | #007F91 | 0.136 |
| Achromatopsia (no color) | #6C6C6C | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3E66CF
#3E66CF
oklch(53.9% 0.169 265.4)
- #8B6800
#8B6800
oklch(53.8% 0.11 85.3)
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 #3E66CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.029
- Warm Blue #4B57DB ΔE 0.042
- Neon Blue #4361EE ΔE 0.050
- Dark Periwinkle #665FD1 ΔE 0.051
- Mid Blue #276AB3 ΔE 0.051
- Iris #6258C4 ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.054
- Azul #1D5DEC ΔE 0.057
Use #3E66CF 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.