#3749B7
Closest named color: Blue Blue (#2242C7). oklch(46% 0.174 270.8), rgb(55, 73, 183).
Aa
White text reads best on this color (7.50:1).
About this color
#3749B7 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.174 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.038 away. White text reads best on it, at 7.50:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.79:1 |
| White text | 7.50:1 |
Values
| HEX | #3749B7 |
| RGB | rgb(55, 73, 183) |
| HSL | hsl(232, 54%, 47%) |
| OKLCH | oklch(46% 0.174 270.8) |
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 #3749B7 | 7.50:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #3749B7 | 2.79:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #3749B7 text on white | 7.50:1 | AAA | Lc 85.6 | Fine for body text |
| #3749B7 text on black | 2.79:1 | Fails | Lc -16.5 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ACBEF8
oklch(80.8% 0.085 271.1)
-
Step 400
400
#819BF4
oklch(70.7% 0.134 270.4)
-
Step 500
500
#647FF0
oklch(63.2% 0.171 270.7)
-
Step 600
600
#4D65DF
oklch(55.7% 0.187 270.7)
-
Step 700
700 (this color)
#3749B7
oklch(46% 0.174 270.8)
-
Step 800
800
#33449C
oklch(42.6% 0.144 270.8)
-
Step 900
900
#2C3B7C
oklch(37.7% 0.111 270.5)
-
Step 950
950
#1A2349
oklch(27.1% 0.071 270.9)
#3749B7 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) | #005BBB | 0.050 |
| Deuteranopia (no green cones) | #004FB5 | 0.037 |
| Tritanopia (no blue cones) | #006579 | 0.141 |
| Achromatopsia (no color) | #555555 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3749B7
#3749B7
oklch(46% 0.174 270.8)
- #6C5500
#6C5500
oklch(46% 0.094 90.5)
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 #3749B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.038
- Majorelle Blue #3F37C9 ΔE 0.045
- Blue With A Hint Of Purple #533CC6 ΔE 0.050
- Sapphire #2138AB ΔE 0.055
- Blueberry #464196 ΔE 0.058
- Blurple #5539CC ΔE 0.059
- Bluey Purple #6241C7 ΔE 0.069
- Cobalt #1E488F ΔE 0.071
Use #3749B7 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.