#3748A7
Closest named color: Blueberry (#464196). oklch(44.5% 0.153 271.1), rgb(55, 72, 167).
Aa
White text reads best on this color (7.93:1).
About this color
#3748A7 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.153 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.036 away. White text reads best on it, at 7.93:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.64:1 |
| White text | 7.93:1 |
Values
| HEX | #3748A7 |
| RGB | rgb(55, 72, 167) |
| HSL | hsl(231, 50%, 44%) |
| OKLCH | oklch(44.5% 0.153 271.1) |
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 #3748A7 | 7.93:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #3748A7 | 2.64:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #3748A7 text on white | 7.93:1 | AAA | Lc 87.1 | Fine for body text |
| #3748A7 text on black | 2.64:1 | Fails | Lc -15.0 | Not readable |
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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ABBEFB
oklch(80.9% 0.089 270.9)
-
Step 400
400
#809AFA
oklch(70.8% 0.144 270.9)
-
Step 500
500
#637DF7
oklch(63.2% 0.183 271.2)
-
Step 600
600
#4C62E5
oklch(55.5% 0.199 271.2)
-
Step 700
700
#3E50C7
oklch(49% 0.185 271.3)
-
Step 800
800 (this color)
#3748A7
oklch(44.5% 0.153 271.1)
-
Step 900
900
#2C3A80
oklch(37.8% 0.119 271.1)
-
Step 950
950
#19224B
oklch(26.9% 0.077 271.1)
#3748A7 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) | #0056AA | 0.045 |
| Deuteranopia (no green cones) | #004CA5 | 0.039 |
| Tritanopia (no blue cones) | #005F70 | 0.127 |
| Achromatopsia (no color) | #515151 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3748A7
#3748A7
oklch(44.5% 0.153 271.1)
- #675100
#675100
oklch(44.5% 0.091 90.6)
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 #3748A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.036
- Cobalt #1E488F ΔE 0.048
- Sapphire #2138AB ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.055
- Dusk Blue #26538D ΔE 0.057
- Blue Blue #2242C7 ΔE 0.057
- Twilight #4E518B ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.064
Use #3748A7 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.