#3647A1
Closest named color: Blueberry (#464196). oklch(43.7% 0.146 271), rgb(54, 71, 161).
Aa
White text reads best on this color (8.16:1).
About this color
#3647A1 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.146 and its hue 271°. 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 8.16:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.57:1 |
| White text | 8.16:1 |
Values
| HEX | #3647A1 |
| RGB | rgb(54, 71, 161) |
| HSL | hsl(230, 50%, 42%) |
| OKLCH | oklch(43.7% 0.146 271) |
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 #3647A1 | 8.16:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #3647A1 | 2.57:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #3647A1 text on white | 8.16:1 | AAA | Lc 87.9 | Fine for body text |
| #3647A1 text on black | 2.57:1 | Fails | Lc -14.3 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ACBEF9
oklch(80.9% 0.086 271.2)
-
Step 400
400
#819AF6
oklch(70.6% 0.138 271)
-
Step 500
500
#647EF2
oklch(63.1% 0.175 271.1)
-
Step 600
600
#4D64E0
oklch(55.5% 0.19 271)
-
Step 700
700
#3F52C3
oklch(49.1% 0.177 271.1)
-
Step 800
800 (this color)
#3647A1
oklch(43.7% 0.146 271)
-
Step 900
900
#2C3A7D
oklch(37.6% 0.114 271)
-
Step 950
950
#1A2349
oklch(27.1% 0.071 270.9)
#3647A1 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) | #0054A4 | 0.044 |
| Deuteranopia (no green cones) | #004B9F | 0.038 |
| Tritanopia (no blue cones) | #005D6D | 0.122 |
| Achromatopsia (no color) | #4F4F4F | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3647A1
#3647A1
oklch(43.7% 0.146 271)
- #644F00
#644F00
oklch(43.7% 0.089 91.1)
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 #3647A1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.030
- Cobalt #1E488F ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.047
- Sapphire #2138AB ΔE 0.049
- Dusk Blue #26538D ΔE 0.051
- Twilight #4E518B ΔE 0.060
- Light Navy #155084 ΔE 0.064
- Denim Blue #3B5B92 ΔE 0.065
Use #3647A1 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.