#3742AE
Closest named color: Sapphire (#2138AB). oklch(43.9% 0.17 272.7), rgb(55, 66, 174).
Aa
White text reads best on this color (8.22:1).
About this color
#3742AE is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.170 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.038 away. White text reads best on it, at 8.22:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.55:1 |
| White text | 8.22:1 |
Values
| HEX | #3742AE |
| RGB | rgb(55, 66, 174) |
| HSL | hsl(234, 52%, 45%) |
| OKLCH | oklch(43.9% 0.17 272.7) |
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 #3742AE | 8.22:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #3742AE | 2.55:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #3742AE text on white | 8.22:1 | AAA | Lc 87.9 | Fine for body text |
| #3742AE text on black | 2.55:1 | Fails | Lc -14.2 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8198FF
oklch(70.7% 0.153 272.5)
-
Step 500
500
#6479FF
oklch(63% 0.199 272.7)
-
Step 600
600
#4E5CF2
oklch(55.6% 0.222 272.7)
-
Step 700
700
#404AD2
oklch(49% 0.206 272.8)
-
Step 800
800 (this color)
#3742AE
oklch(43.9% 0.17 272.7)
-
Step 900
900
#2C3787
oklch(37.8% 0.133 272.4)
-
Step 950
950
#1A214F
oklch(27.1% 0.084 273)
#3742AE 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) | #0054B2 | 0.051 |
| Deuteranopia (no green cones) | #0049AC | 0.040 |
| Tritanopia (no blue cones) | #005D71 | 0.139 |
| Achromatopsia (no color) | #4F4F4F | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3742AE
#3742AE
oklch(43.9% 0.17 272.7)
- #645000
#645000
oklch(43.9% 0.09 92.1)
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 #3742AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.038
- Blueberry #464196 ΔE 0.044
- Blue Blue #2242C7 ΔE 0.045
- Majorelle Blue #3F37C9 ΔE 0.048
- Blue With A Hint Of Purple #533CC6 ΔE 0.056
- Cobalt #1E488F ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.062
- Blurple #5539CC ΔE 0.065
Use #3742AE 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.