#3742A7
Closest named color: Blueberry (#464196). oklch(43.3% 0.161 272.9), rgb(55, 66, 167).
Aa
White text reads best on this color (8.40:1).
About this color
#3742A7 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.161 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.035 away. White text reads best on it, at 8.40:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.161) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.49:1 |
| White text | 8.40:1 |
Values
| HEX | #3742A7 |
| RGB | rgb(55, 66, 167) |
| HSL | hsl(234, 50%, 44%) |
| OKLCH | oklch(43.3% 0.161 272.9) |
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 #3742A7 | 8.40:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #3742A7 | 2.49:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #3742A7 text on white | 8.40:1 | AAA | Lc 88.5 | Fine for body text |
| #3742A7 text on black | 2.49:1 | Fails | Lc -13.7 | 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
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CDD8FD
oklch(88.6% 0.052 272.2)
-
Step 300
300
#ACBDFE
oklch(80.9% 0.094 272.8)
-
Step 400
400
#8298FE
oklch(70.7% 0.151 272.8)
-
Step 500
500
#667AFC
oklch(63.1% 0.193 273)
-
Step 600
600
#505FEB
oklch(55.7% 0.209 272.9)
-
Step 700
700
#424DCC
oklch(49.1% 0.194 273.1)
-
Step 800
800 (this color)
#3742A7
oklch(43.3% 0.161 272.9)
-
Step 900
900
#2E3883
oklch(37.8% 0.125 273.1)
-
Step 950
950
#1A214D
oklch(26.9% 0.081 272.9)
#3742A7 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) | #0053AA | 0.051 |
| Deuteranopia (no green cones) | #0048A5 | 0.041 |
| Tritanopia (no blue cones) | #005B6E | 0.132 |
| Achromatopsia (no color) | #4D4D4D | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3742A7
#3742A7
oklch(43.3% 0.161 272.9)
- #624F00
#624F00
oklch(43.4% 0.089 92.8)
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 #3742A7, closest first.
No curated palette has a color within ΔE 0.04 of #3742A7.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.035
- Sapphire #2138AB ΔE 0.038
- Cobalt #1E488F ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.052
- Blue Blue #2242C7 ΔE 0.055
- Majorelle Blue #3F37C9 ΔE 0.058
- Blue With A Hint Of Purple #533CC6 ΔE 0.064
- Dusk Blue #26538D ΔE 0.066
Use #3742A7 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.