#3750B2
Closest named color: Blue Blue (#2242C7). oklch(46.9% 0.158 268.7), rgb(55, 80, 178).
Aa
White text reads best on this color (7.11:1).
About this color
#3750B2 is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.158 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.053 away. White text reads best on it, at 7.11:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.95:1 |
| White text | 7.11:1 |
Values
| HEX | #3750B2 |
| RGB | rgb(55, 80, 178) |
| HSL | hsl(228, 53%, 46%) |
| OKLCH | oklch(46.9% 0.158 268.7) |
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 #3750B2 | 7.11:1 | AAA | Lc -89.2 | Fine for body text |
| Black text on #3750B2 | 2.95:1 | Fails | Lc 19.8 | Dividers and decoration only |
| #3750B2 text on white | 7.11:1 | AAA | Lc 84.3 | Fine for body text |
| #3750B2 text on black | 2.95:1 | Fails | Lc -17.7 | 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 700.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ACBFF3
oklch(80.8% 0.077 269)
-
Step 400
400
#819DED
oklch(70.8% 0.122 268.5)
-
Step 500
500
#6382E7
oklch(63.1% 0.156 268.8)
-
Step 600
600
#4B69D6
oklch(55.7% 0.171 268.7)
-
Step 700
700 (this color)
#3750B2
oklch(46.9% 0.158 268.7)
-
Step 800
800
#324796
oklch(42.6% 0.132 269)
-
Step 900
900
#2B3D77
oklch(37.7% 0.101 268.3)
-
Step 950
950
#192446
oklch(27% 0.065 268.3)
#3750B2 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) | #005EB5 | 0.043 |
| Deuteranopia (no green cones) | #0053B0 | 0.035 |
| Tritanopia (no blue cones) | #006879 | 0.130 |
| Achromatopsia (no color) | #585858 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3750B2
#3750B2
oklch(46.9% 0.158 268.7)
- #705700
#705700
oklch(46.9% 0.096 89.3)
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 #3750B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.053
- Blueberry #464196 ΔE 0.058
- Blue With A Hint Of Purple #533CC6 ΔE 0.063
- Denim Blue #3B5B92 ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.064
- Dusk Blue #26538D ΔE 0.065
- Cobalt #1E488F ΔE 0.067
- Sapphire #2138AB ΔE 0.068
Use #3750B2 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.