#3742A6
Closest named color: Blueberry (#464196). oklch(43.2% 0.16 273), rgb(55, 66, 166).
Aa
White text reads best on this color (8.42:1).
About this color
#3742A6 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.160 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.033 away. White text reads best on it, at 8.42:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.49:1 |
| White text | 8.42:1 |
Values
| HEX | #3742A6 |
| RGB | rgb(55, 66, 166) |
| HSL | hsl(234, 50%, 43%) |
| OKLCH | oklch(43.2% 0.16 273) |
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 #3742A6 | 8.42:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #3742A6 | 2.49:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #3742A6 text on white | 8.42:1 | AAA | Lc 88.6 | Fine for body text |
| #3742A6 text on black | 2.49:1 | Fails | Lc -13.6 | 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
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CDD8FC
oklch(88.5% 0.051 271.9)
-
Step 300
300
#ACBDFD
oklch(80.9% 0.093 272.7)
-
Step 400
400
#8398FD
oklch(70.8% 0.149 273.2)
-
Step 500
500
#667AFB
oklch(63.1% 0.192 273)
-
Step 600
600
#505FEA
oklch(55.6% 0.208 272.9)
-
Step 700
700
#424DCB
oklch(49% 0.193 273.1)
-
Step 800
800 (this color)
#3742A6
oklch(43.2% 0.16 273)
-
Step 900
900
#2E3882
oklch(37.7% 0.124 273.1)
-
Step 950
950
#1B224C
oklch(27.1% 0.078 273)
#3742A6 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) | #0052A9 | 0.049 |
| Deuteranopia (no green cones) | #0048A4 | 0.041 |
| Tritanopia (no blue cones) | #005B6D | 0.132 |
| Achromatopsia (no color) | #4D4D4D | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3742A6
#3742A6
oklch(43.2% 0.16 273)
- #614E00
#614E00
oklch(43.1% 0.088 92.7)
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 #3742A6, closest first.
No curated palette has a color within ΔE 0.04 of #3742A6.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.033
- Sapphire #2138AB ΔE 0.039
- Cobalt #1E488F ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.051
- Blue Blue #2242C7 ΔE 0.057
- Majorelle Blue #3F37C9 ΔE 0.060
- Dusk Blue #26538D ΔE 0.065
- Blue With A Hint Of Purple #533CC6 ΔE 0.066
Use #3742A6 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.