#3F4B90
Closest named color: Blueberry (#464196). oklch(43.9% 0.114 273.4), rgb(63, 75, 144).
Aa
White text reads best on this color (8.01:1).
About this color
#3F4B90 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.114 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.030 away. White text reads best on it, at 8.01:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.62:1 |
| White text | 8.01:1 |
Values
| HEX | #3F4B90 |
| RGB | rgb(63, 75, 144) |
| HSL | hsl(231, 39%, 41%) |
| OKLCH | oklch(43.9% 0.114 273.4) |
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 #3F4B90 | 8.01:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #3F4B90 | 2.62:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #3F4B90 text on white | 8.01:1 | AAA | Lc 87.6 | Fine for body text |
| #3F4B90 text on black | 2.62:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B2BEEC
oklch(80.8% 0.066 273.4)
-
Step 400
400
#8B9CE3
oklch(70.8% 0.106 273.1)
-
Step 500
500
#7081DB
oklch(63% 0.136 273.8)
-
Step 600
600
#5969C8
oklch(55.6% 0.147 273.5)
-
Step 700
700
#4957AD
oklch(49.1% 0.137 273.4)
-
Step 800
800 (this color)
#3F4B90
oklch(43.9% 0.114 273.4)
-
Step 900
900
#333D70
oklch(37.8% 0.088 273.2)
-
Step 950
950
#1E2442
oklch(27.1% 0.056 273.5)
#3F4B90 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) | #2B5493 | 0.031 |
| Deuteranopia (no green cones) | #214D8F | 0.033 |
| Tritanopia (no blue cones) | #145A66 | 0.101 |
| Achromatopsia (no color) | #505050 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4B90
#3F4B90
oklch(43.9% 0.114 273.4)
- #635000
#635000
oklch(43.8% 0.09 93)
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 #3F4B90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.030
- Twilight #4E518B ΔE 0.031
- Dusk Blue #26538D ΔE 0.034
- Dark Slate Blue #483D8B ΔE 0.038
- Cobalt #1E488F ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.045
- Dusk #4E5481 ΔE 0.046
- Light Navy #155084 ΔE 0.048
Use #3F4B90 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.