#3742A3
Closest named color: Blueberry (#464196). oklch(43% 0.155 273.1), rgb(55, 66, 163).
Aa
White text reads best on this color (8.49:1).
About this color
#3742A3 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.155 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.030 away. White text reads best on it, at 8.49:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.47:1 |
| White text | 8.49:1 |
Values
| HEX | #3742A3 |
| RGB | rgb(55, 66, 163) |
| HSL | hsl(234, 50%, 43%) |
| OKLCH | oklch(43% 0.155 273.1) |
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 #3742A3 | 8.49:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #3742A3 | 2.47:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #3742A3 text on white | 8.49:1 | AAA | Lc 88.8 | Fine for body text |
| #3742A3 text on black | 2.47:1 | Fails | Lc -13.4 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FB
oklch(88.6% 0.049 272.8)
-
Step 300
300
#ADBDFC
oklch(80.9% 0.091 273.2)
-
Step 400
400
#8398FA
oklch(70.6% 0.145 273)
-
Step 500
500
#677BF8
oklch(63.1% 0.186 273.1)
-
Step 600
600
#5160E7
oklch(55.6% 0.203 273.1)
-
Step 700
700
#424EC9
oklch(49% 0.189 273)
-
Step 800
800 (this color)
#3742A3
oklch(43% 0.155 273.1)
-
Step 900
900
#2E3981
oklch(37.8% 0.121 272.7)
-
Step 950
950
#1B224B
oklch(27% 0.076 273)
#3742A3 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) | #0052A6 | 0.050 |
| Deuteranopia (no green cones) | #0048A1 | 0.041 |
| Tritanopia (no blue cones) | #005A6C | 0.129 |
| Achromatopsia (no color) | #4D4D4D | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3742A3
#3742A3
oklch(43% 0.155 273.1)
- #604E00
#604E00
oklch(43% 0.088 93.6)
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 #3742A3, closest first.
No curated palette has a color within ΔE 0.04 of #3742A3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.030
- Sapphire #2138AB ΔE 0.040
- Cobalt #1E488F ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.047
- Blue Blue #2242C7 ΔE 0.061
- Dusk Blue #26538D ΔE 0.062
- Majorelle Blue #3F37C9 ΔE 0.064
- Blue With A Hint Of Purple #533CC6 ΔE 0.070
Use #3742A3 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.