#3747AA
Closest named color: Blueberry (#464196). oklch(44.5% 0.159 271.4), rgb(55, 71, 170).
Aa
White text reads best on this color (7.94:1).
About this color
#3747AA is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.159 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.039 away. White text reads best on it, at 7.94:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.64:1 |
| White text | 7.94:1 |
Values
| HEX | #3747AA |
| RGB | rgb(55, 71, 170) |
| HSL | hsl(232, 51%, 44%) |
| OKLCH | oklch(44.5% 0.159 271.4) |
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 #3747AA | 7.94:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #3747AA | 2.64:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #3747AA text on white | 7.94:1 | AAA | Lc 87.1 | Fine for body text |
| #3747AA text on black | 2.64:1 | Fails | Lc -15.0 | 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
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#ABBEFD
oklch(81% 0.092 271.3)
-
Step 400
400
#8099FD
oklch(70.8% 0.149 271.5)
-
Step 500
500
#627CFA
oklch(63.1% 0.189 271.3)
-
Step 600
600
#4C61E9
oklch(55.6% 0.205 271.4)
-
Step 700
700
#3E4FCB
oklch(49.2% 0.191 271.4)
-
Step 800
800 (this color)
#3747AA
oklch(44.5% 0.159 271.4)
-
Step 900
900
#2B3982
oklch(37.7% 0.123 271.1)
-
Step 950
950
#19224C
oklch(27% 0.078 271.2)
#3747AA 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) | #0056AD | 0.047 |
| Deuteranopia (no green cones) | #004CA8 | 0.039 |
| Tritanopia (no blue cones) | #005F71 | 0.130 |
| Achromatopsia (no color) | #515151 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3747AA
#3747AA
oklch(44.5% 0.159 271.4)
- #665100
#665100
oklch(44.4% 0.091 91.5)
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 #3747AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.039
- Sapphire #2138AB ΔE 0.047
- Cobalt #1E488F ΔE 0.053
- Blue Blue #2242C7 ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.058
- Majorelle Blue #3F37C9 ΔE 0.059
- Dusk Blue #26538D ΔE 0.062
- Blue With A Hint Of Purple #533CC6 ΔE 0.062
Use #3747AA 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.