#3947B2
Closest named color: Blue Blue (#2242C7). oklch(45.3% 0.169 272.1), rgb(57, 71, 178).
Aa
White text reads best on this color (7.72:1).
About this color
#3947B2 is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.169 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.043 away. White text reads best on it, at 7.72:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.71:1 |
| White text | 7.72:1 |
Values
| HEX | #3947B2 |
| RGB | rgb(57, 71, 178) |
| HSL | hsl(233, 51%, 46%) |
| OKLCH | oklch(45.3% 0.169 272.1) |
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 #3947B2 | 7.72:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #3947B2 | 2.71:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #3947B2 text on white | 7.72:1 | AAA | Lc 86.4 | Fine for body text |
| #3947B2 text on black | 2.71:1 | Fails | Lc -15.7 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CCD8FE
oklch(88.5% 0.054 271.5)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8098FF
oklch(70.7% 0.153 272.1)
-
Step 500
500
#637AFF
oklch(63.2% 0.198 272.1)
-
Step 600
600
#4C5DF1
oklch(55.6% 0.22 272)
-
Step 700
700
#3E4BD2
oklch(49.1% 0.205 272)
-
Step 800
800 (this color)
#3947B2
oklch(45.3% 0.169 272.1)
-
Step 900
900
#2B3786
oklch(37.6% 0.132 271.9)
-
Step 950
950
#19214E
oklch(26.9% 0.083 272.1)
#3947B2 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) | #0058B6 | 0.050 |
| Deuteranopia (no green cones) | #004DB0 | 0.040 |
| Tritanopia (no blue cones) | #006275 | 0.139 |
| Achromatopsia (no color) | #535353 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3947B2
#3947B2
oklch(45.3% 0.169 272.1)
- #695400
#695400
oklch(45.4% 0.093 92)
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 #3947B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.043
- Majorelle Blue #3F37C9 ΔE 0.048
- Blueberry #464196 ΔE 0.049
- Sapphire #2138AB ΔE 0.050
- Blue With A Hint Of Purple #533CC6 ΔE 0.052
- Blurple #5539CC ΔE 0.061
- Cobalt #1E488F ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.069
Use #3947B2 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.