#3665D1
Closest named color: Royal Blue (#4169E1). oklch(53.5% 0.175 263.8), rgb(54, 101, 209).
Aa
White text reads best on this color (5.33:1).
About this color
#3665D1 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.175 and its hue 264°. 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 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.93:1 |
| White text | 5.33:1 |
Values
| HEX | #3665D1 |
| RGB | rgb(54, 101, 209) |
| HSL | hsl(222, 63%, 52%) |
| OKLCH | oklch(53.5% 0.175 263.8) |
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 #3665D1 | 5.33:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #3665D1 | 3.93:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #3665D1 text on white | 5.33:1 | AA | Lc 76.1 | Fine for body text |
| #3665D1 text on black | 3.93:1 | AA large text | Lc -25.7 | 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
#A7C1F4
oklch(80.9% 0.078 263.6)
-
Step 400
400
#789FEF
oklch(70.8% 0.125 263.7)
-
Step 500
500
#5684EA
oklch(63% 0.162 264.1)
-
Step 600
600 (this color)
#3665D1
oklch(53.5% 0.175 263.8)
-
Step 700
700
#2E59BB
oklch(49.1% 0.162 263.7)
-
Step 800
800
#274998
oklch(42.7% 0.136 264)
-
Step 900
900
#243E79
oklch(37.7% 0.106 264.1)
-
Step 950
950
#152547
oklch(27.1% 0.067 263.6)
#3665D1 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) | #1D72D5 | 0.034 |
| Deuteranopia (no green cones) | #0064CF | 0.028 |
| Tritanopia (no blue cones) | #007F91 | 0.139 |
| Achromatopsia (no color) | #6B6B6B | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3665D1
#3665D1
oklch(53.5% 0.175 263.8)
- #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 #3665D1, 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 0.041
- Neon Blue #4361EE ΔE 0.048
- Cerulean Blue #056EEE ΔE 0.050
- Azul #1D5DEC ΔE 0.050
- Mid Blue #276AB3 ΔE 0.052
- Dark Periwinkle #665FD1 ΔE 0.057
- Iris #6258C4 ΔE 0.060
Use #3665D1 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.