#3743E3
Closest named color: Light Royal Blue (#3A2EFE). oklch(49% 0.236 270.7), rgb(55, 67, 227).
Aa
White text reads best on this color (6.83:1).
About this color
#3743E3 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.236 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Light Royal Blue (#3A2EFE), ΔE 0.047 away. White text reads best on it, at 6.83:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.236) |
| Temperature | cool |
| Nearest name | Light Royal Blue (#3A2EFE) |
| Black text | 3.07:1 |
| White text | 6.83:1 |
Values
| HEX | #3743E3 |
| RGB | rgb(55, 67, 227) |
| HSL | hsl(236, 75%, 55%) |
| OKLCH | oklch(49% 0.236 270.7) |
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 #3743E3 | 6.83:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #3743E3 | 3.07:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #3743E3 text on white | 6.83:1 | AA | Lc 82.6 | Fine for body text |
| #3743E3 text on black | 3.07:1 | AA large text | Lc -19.3 | 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 700.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5F7BFF
oklch(63.1% 0.198 270.7)
-
Step 600
600
#4558FF
oklch(55.6% 0.245 270.7)
-
Step 700
700 (this color)
#3743E3
oklch(49% 0.236 270.7)
-
Step 800
800
#2D39B7
oklch(42.6% 0.195 270.8)
-
Step 900
900
#263491
oklch(37.7% 0.153 270.5)
-
Step 950
950
#162055
oklch(27.1% 0.097 270.5)
#3743E3 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) | #0063E8 | 0.068 |
| Deuteranopia (no green cones) | #0052E0 | 0.038 |
| Tritanopia (no blue cones) | #00708E | 0.184 |
| Achromatopsia (no color) | #5B5B5B | 0.237 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3743E3
#3743E3
oklch(49% 0.236 270.7)
- #765D00
#765D00
oklch(49% 0.1 90.4)
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 #3743E3, closest first.
No curated palette has a color within ΔE 0.04 of #3743E3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Royal Blue #3A2EFE ΔE 0.047
- Majorelle Blue #3F37C9 ΔE 0.048
- Blue Blue #2242C7 ΔE 0.050
- Vibrant Blue #0339F8 ΔE 0.052
- Warm Blue #4B57DB ΔE 0.053
- Azul #1D5DEC ΔE 0.055
- Electric Blue #0652FF ΔE 0.057
- Blurple #5539CC ΔE 0.057
Use #3743E3 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.