#3766D4
Closest named color: Royal Blue (#4169E1). oklch(54% 0.177 264), rgb(55, 102, 212).
Aa
White text reads best on this color (5.23:1).
About this color
#3766D4 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.177 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.024 away. White text reads best on it, at 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.177) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.01:1 |
| White text | 5.23:1 |
Values
| HEX | #3766D4 |
| RGB | rgb(55, 102, 212) |
| HSL | hsl(222, 65%, 52%) |
| OKLCH | oklch(54% 0.177 264) |
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 #3766D4 | 5.23:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #3766D4 | 4.01:1 | AA large text | Lc 28.6 | Dividers and decoration only |
| #3766D4 text on white | 5.23:1 | AA | Lc 75.5 | Fine for body text |
| #3766D4 text on black | 4.01:1 | AA large text | Lc -26.2 | 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
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF7
oklch(88.5% 0.044 262.4)
-
Step 300
300
#A7C1F5
oklch(81% 0.079 264)
-
Step 400
400
#789FF0
oklch(70.8% 0.127 263.9)
-
Step 500
500
#5584EB
oklch(63.1% 0.163 263.9)
-
Step 600
600 (this color)
#3766D4
oklch(54% 0.177 264)
-
Step 700
700
#2E59BD
oklch(49.2% 0.165 263.8)
-
Step 800
800
#274999
oklch(42.8% 0.137 264.1)
-
Step 900
900
#233E79
oklch(37.7% 0.106 263.6)
-
Step 950
950
#152547
oklch(27.1% 0.067 263.6)
#3766D4 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) | #1B74D8 | 0.036 |
| Deuteranopia (no green cones) | #0065D2 | 0.028 |
| Tritanopia (no blue cones) | #008193 | 0.141 |
| Achromatopsia (no color) | #6C6C6C | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3766D4
#3766D4
oklch(54% 0.177 264)
- #8D6800
#8D6800
oklch(54% 0.111 84)
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 #3766D4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.024
- Warm Blue #4B57DB ΔE 0.040
- Neon Blue #4361EE ΔE 0.044
- Cerulean Blue #056EEE ΔE 0.046
- Azul #1D5DEC ΔE 0.048
- Mid Blue #276AB3 ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.056
- Iris #6258C4 ΔE 0.061
Use #3766D4 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.