#3F429E
Closest named color: Blueberry (#464196). oklch(43.1% 0.146 276.9), rgb(63, 66, 158).
Aa
White text reads best on this color (8.45:1).
About this color
#3F429E is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.146 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.017 away. White text reads best on it, at 8.45:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.48:1 |
| White text | 8.45:1 |
Values
| HEX | #3F429E |
| RGB | rgb(63, 66, 158) |
| HSL | hsl(238, 43%, 43%) |
| OKLCH | oklch(43.1% 0.146 276.9) |
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 #3F429E | 8.45:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #3F429E | 2.48:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #3F429E text on white | 8.45:1 | AAA | Lc 88.8 | Fine for body text |
| #3F429E text on black | 2.48:1 | Fails | Lc -13.4 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D1D7F9
oklch(88.5% 0.047 277.5)
-
Step 300
300
#B2BCF8
oklch(80.9% 0.086 277)
-
Step 400
400
#8B97F5
oklch(70.7% 0.138 276.8)
-
Step 500
500
#717AF1
oklch(63.1% 0.176 276.9)
-
Step 600
600
#5C60DF
oklch(55.7% 0.189 276.9)
-
Step 700
700
#4C4EC2
oklch(49.1% 0.177 276.9)
-
Step 800
800 (this color)
#3F429E
oklch(43.1% 0.146 276.9)
-
Step 900
900
#34387C
oklch(37.6% 0.113 276.9)
-
Step 950
950
#1E2149
oklch(26.9% 0.073 277.1)
#3F429E 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) | #0051A1 | 0.056 |
| Deuteranopia (no green cones) | #00499C | 0.052 |
| Tritanopia (no blue cones) | #005869 | 0.127 |
| Achromatopsia (no color) | #4D4D4D | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F429E
#3F429E
oklch(43.1% 0.146 276.9)
- #5E4F00
#5E4F00
oklch(43% 0.089 96.5)
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 #3F429E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.017
- Dark Slate Blue #483D8B ΔE 0.035
- Cobalt #1E488F ΔE 0.047
- Sapphire #2138AB ΔE 0.052
- Twilight #4E518B ΔE 0.060
- Dusk Blue #26538D ΔE 0.061
- Blue With A Hint Of Purple #533CC6 ΔE 0.071
- Majorelle Blue #3F37C9 ΔE 0.072
Use #3F429E 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.