#3749AB
Closest named color: Blueberry (#464196). oklch(45% 0.158 270.8), rgb(55, 73, 171).
Aa
White text reads best on this color (7.76:1).
About this color
#3749AB is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.158 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.042 away. White text reads best on it, at 7.76:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.70:1 |
| White text | 7.76:1 |
Values
| HEX | #3749AB |
| RGB | rgb(55, 73, 171) |
| HSL | hsl(231, 51%, 44%) |
| OKLCH | oklch(45% 0.158 270.8) |
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 #3749AB | 7.76:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #3749AB | 2.70:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #3749AB text on white | 7.76:1 | AAA | Lc 86.6 | Fine for body text |
| #3749AB text on black | 2.70:1 | Fails | Lc -15.5 | Dividers and decoration only |
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
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#AABEFD
oklch(80.9% 0.092 270.6)
-
Step 400
400
#7F99FC
oklch(70.6% 0.148 271.1)
-
Step 500
500
#617CFA
oklch(63.1% 0.189 271)
-
Step 600
600
#4A61E9
oklch(55.5% 0.206 270.8)
-
Step 700
700
#3C4FCA
oklch(49% 0.191 270.8)
-
Step 800
800 (this color)
#3749AB
oklch(45% 0.158 270.8)
-
Step 900
900
#2B3982
oklch(37.7% 0.123 271.1)
-
Step 950
950
#19224C
oklch(27% 0.078 271.2)
#3749AB 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) | #0058AE | 0.046 |
| Deuteranopia (no green cones) | #004DA9 | 0.038 |
| Tritanopia (no blue cones) | #006173 | 0.129 |
| Achromatopsia (no color) | #525252 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3749AB
#3749AB
oklch(45% 0.158 270.8)
- #685200
#685200
oklch(44.8% 0.092 90.8)
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 #3749AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.042
- Sapphire #2138AB ΔE 0.051
- Blue Blue #2242C7 ΔE 0.053
- Cobalt #1E488F ΔE 0.054
- Majorelle Blue #3F37C9 ΔE 0.060
- Dusk Blue #26538D ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.061
- Blue With A Hint Of Purple #533CC6 ΔE 0.062
Use #3749AB 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.