#3647A7
Closest named color: Blueberry (#464196). oklch(44.2% 0.155 271.1), rgb(54, 71, 167).
Aa
White text reads best on this color (8.02:1).
About this color
#3647A7 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.155 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.036 away. White text reads best on it, at 8.02:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.61:1 |
| White text | 8.02:1 |
Values
| HEX | #3647A7 |
| RGB | rgb(54, 71, 167) |
| HSL | hsl(231, 51%, 43%) |
| OKLCH | oklch(44.2% 0.155 271.1) |
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 #3647A7 | 8.02:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #3647A7 | 2.61:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #3647A7 text on white | 8.02:1 | AAA | Lc 87.4 | Fine for body text |
| #3647A7 text on black | 2.61:1 | Fails | Lc -14.7 | 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
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ABBEFC
oklch(80.9% 0.09 271.1)
-
Step 400
400
#809AFA
oklch(70.8% 0.144 270.9)
-
Step 500
500
#627DF8
oklch(63.2% 0.185 270.9)
-
Step 600
600
#4C62E7
oklch(55.7% 0.201 271.2)
-
Step 700
700
#3D50C8
oklch(49% 0.186 270.9)
-
Step 800
800 (this color)
#3647A7
oklch(44.2% 0.155 271.1)
-
Step 900
900
#2B3981
oklch(37.6% 0.122 271.1)
-
Step 950
950
#19224B
oklch(26.9% 0.077 271.1)
#3647A7 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) | #0056AA | 0.047 |
| Deuteranopia (no green cones) | #004BA5 | 0.038 |
| Tritanopia (no blue cones) | #005E70 | 0.126 |
| Achromatopsia (no color) | #505050 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3647A7
#3647A7
oklch(44.2% 0.155 271.1)
- #665000
#665000
oklch(44.1% 0.09 90.4)
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 #3647A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.036
- Sapphire #2138AB ΔE 0.047
- Cobalt #1E488F ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.055
- Blue Blue #2242C7 ΔE 0.056
- Dusk Blue #26538D ΔE 0.058
- Majorelle Blue #3F37C9 ΔE 0.063
- Twilight #4E518B ΔE 0.066
Use #3647A7 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.