#3750A5
Closest named color: Blueberry (#464196). oklch(46% 0.14 268.1), rgb(55, 80, 165).
Aa
White text reads best on this color (7.36:1).
About this color
#3750A5 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.140 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.045 away. White text reads best on it, at 7.36:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.85:1 |
| White text | 7.36:1 |
Values
| HEX | #3750A5 |
| RGB | rgb(55, 80, 165) |
| HSL | hsl(226, 50%, 43%) |
| OKLCH | oklch(46% 0.14 268.1) |
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 #3750A5 | 7.36:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #3750A5 | 2.85:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #3750A5 text on white | 7.36:1 | AAA | Lc 85.3 | Fine for body text |
| #3750A5 text on black | 2.85:1 | Fails | Lc -16.8 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F3
oklch(88.5% 0.038 267.3)
-
Step 300
300
#AEC0ED
oklch(81% 0.067 267.8)
-
Step 400
400
#849EE5
oklch(70.8% 0.108 268.2)
-
Step 500
500
#6684DD
oklch(63.1% 0.138 268.2)
-
Step 600
600
#4E6CCB
oklch(55.7% 0.151 268.1)
-
Step 700
700 (this color)
#3750A5
oklch(46% 0.14 268.1)
-
Step 800
800
#34498E
oklch(42.6% 0.117 268.4)
-
Step 900
900
#2D3E71
oklch(37.7% 0.09 268)
-
Step 950
950
#1A2542
oklch(27% 0.056 266.9)
#3750A5 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) | #1E5BA8 | 0.033 |
| Deuteranopia (no green cones) | #0051A3 | 0.037 |
| Tritanopia (no blue cones) | #006473 | 0.116 |
| Achromatopsia (no color) | #565656 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3750A5
#3750A5
oklch(46% 0.14 268.1)
- #6E5400
#6E5400
oklch(46% 0.094 87.8)
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 #3750A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.045
- Dusk Blue #26538D ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.048
- Cobalt #1E488F ΔE 0.051
- Twilight #4E518B ΔE 0.052
- Dusky Blue #475F94 ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.063
Use #3750A5 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.