#3B66CE
Closest named color: Royal Blue (#4169E1). oklch(53.7% 0.168 264.5), rgb(59, 102, 206).
Aa
White text reads best on this color (5.27:1).
About this color
#3B66CE is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.168 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.031 away. White text reads best on it, at 5.27:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.97:1 |
| White text | 5.27:1 |
Values
| HEX | #3B66CE |
| RGB | rgb(59, 102, 206) |
| HSL | hsl(222, 60%, 52%) |
| OKLCH | oklch(53.7% 0.168 264.5) |
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 #3B66CE | 5.27:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #3B66CE | 3.97:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #3B66CE text on white | 5.27:1 | AA | Lc 75.8 | Fine for body text |
| #3B66CE text on black | 3.97:1 | AA large text | Lc -25.9 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CBD9F6
oklch(88.4% 0.043 265)
-
Step 300
300
#A8C1F2
oklch(80.9% 0.075 263.7)
-
Step 400
400
#7B9FEC
oklch(70.8% 0.12 264.4)
-
Step 500
500
#5A85E6
oklch(63.2% 0.154 264.4)
-
Step 600
600 (this color)
#3B66CE
oklch(53.7% 0.168 264.5)
-
Step 700
700
#3259B8
oklch(49% 0.157 264.5)
-
Step 800
800
#2A4A95
oklch(42.8% 0.129 264.3)
-
Step 900
900
#263E77
oklch(37.7% 0.102 264.8)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#3B66CE 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) | #2773D2 | 0.034 |
| Deuteranopia (no green cones) | #0065CC | 0.032 |
| Tritanopia (no blue cones) | #007F90 | 0.136 |
| Achromatopsia (no color) | #6C6C6C | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B66CE
#3B66CE
oklch(53.7% 0.168 264.5)
- #8B6700
#8B6700
oklch(53.6% 0.11 84.4)
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 #3B66CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.031
- Warm Blue #4B57DB ΔE 0.043
- Mid Blue #276AB3 ΔE 0.048
- Neon Blue #4361EE ΔE 0.052
- Dark Periwinkle #665FD1 ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.055
- Iris #6258C4 ΔE 0.056
- French Blue #436BAD ΔE 0.056
Use #3B66CE 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.