#3F43AB
Closest named color: Blueberry (#464196). oklch(44.4% 0.163 275.8), rgb(63, 67, 171).
Aa
White text reads best on this color (8.06:1).
About this color
#3F43AB is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.163 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.035 away. White text reads best on it, at 8.06:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.60:1 |
| White text | 8.06:1 |
Values
| HEX | #3F43AB |
| RGB | rgb(63, 67, 171) |
| HSL | hsl(238, 46%, 46%) |
| OKLCH | oklch(44.4% 0.163 275.8) |
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 #3F43AB | 8.06:1 | AAA | Lc -92.2 | Preferred for body text |
| Black text on #3F43AB | 2.60:1 | Fails | Lc 16.5 | Dividers and decoration only |
| #3F43AB text on white | 8.06:1 | AAA | Lc 87.5 | Fine for body text |
| #3F43AB text on black | 2.60:1 | Fails | Lc -14.6 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CFD7FD
oklch(88.5% 0.053 275.9)
-
Step 300
300
#AFBCFE
oklch(80.9% 0.095 275.5)
-
Step 400
400
#8796FE
oklch(70.7% 0.152 275.6)
-
Step 500
500
#6D77FC
oklch(63% 0.195 276)
-
Step 600
600
#585CEB
oklch(55.6% 0.211 275.9)
-
Step 700
700
#484ACD
oklch(49.1% 0.197 275.7)
-
Step 800
800 (this color)
#3F43AB
oklch(44.4% 0.163 275.8)
-
Step 900
900
#323683
oklch(37.7% 0.127 276.2)
-
Step 950
950
#1D214D
oklch(27.1% 0.08 275.8)
#3F43AB 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) | #0055AE | 0.058 |
| Deuteranopia (no green cones) | #004BA9 | 0.050 |
| Tritanopia (no blue cones) | #005D70 | 0.138 |
| Achromatopsia (no color) | #505050 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F43AB
#3F43AB
oklch(44.4% 0.163 275.8)
- #635200
#635200
oklch(44.3% 0.091 95.1)
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 #3F43AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.035
- Sapphire #2138AB ΔE 0.049
- Majorelle Blue #3F37C9 ΔE 0.053
- Blue With A Hint Of Purple #533CC6 ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.054
- Blue Blue #2242C7 ΔE 0.055
- Cobalt #1E488F ΔE 0.061
- Blurple #5539CC ΔE 0.063
Use #3F43AB 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.