#3647A3
Closest named color: Blueberry (#464196). oklch(43.9% 0.149 271), rgb(54, 71, 163).
Aa
White text reads best on this color (8.11:1).
About this color
#3647A3 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.149 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.032 away. White text reads best on it, at 8.11:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.58:1 |
| White text | 8.11:1 |
Values
| HEX | #3647A3 |
| RGB | rgb(54, 71, 163) |
| HSL | hsl(231, 50%, 43%) |
| OKLCH | oklch(43.9% 0.149 271) |
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 #3647A3 | 8.11:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #3647A3 | 2.58:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #3647A3 text on white | 8.11:1 | AAA | Lc 87.7 | Fine for body text |
| #3647A3 text on black | 2.58:1 | Fails | Lc -14.4 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
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
#ACBEFA
oklch(80.9% 0.087 271.4)
-
Step 400
400
#819AF7
oklch(70.7% 0.139 271.1)
-
Step 500
500
#637EF4
oklch(63.2% 0.178 270.8)
-
Step 600
600
#4D63E3
oklch(55.6% 0.195 271.2)
-
Step 700
700
#3E51C5
oklch(49% 0.181 271)
-
Step 800
800 (this color)
#3647A3
oklch(43.9% 0.149 271)
-
Step 900
900
#2C3A7E
oklch(37.7% 0.116 271.1)
-
Step 950
950
#1A234A
oklch(27.1% 0.073 271.1)
#3647A3 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) | #0055A6 | 0.045 |
| Deuteranopia (no green cones) | #004BA1 | 0.038 |
| Tritanopia (no blue cones) | #005D6E | 0.123 |
| Achromatopsia (no color) | #505050 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3647A3
#3647A3
oklch(43.9% 0.149 271)
- #655000
#655000
oklch(44% 0.09 91.3)
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 #3647A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.032
- Cobalt #1E488F ΔE 0.042
- Sapphire #2138AB ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.050
- Dusk Blue #26538D ΔE 0.053
- Twilight #4E518B ΔE 0.062
- Blue Blue #2242C7 ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.066
Use #3647A3 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.