#3F449B
Closest named color: Blueberry (#464196). oklch(43.3% 0.139 276.4), rgb(63, 68, 155).
Aa
White text reads best on this color (8.36:1).
About this color
#3F449B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.139 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.014 away. White text reads best on it, at 8.36:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.51:1 |
| White text | 8.36:1 |
Values
| HEX | #3F449B |
| RGB | rgb(63, 68, 155) |
| HSL | hsl(237, 42%, 43%) |
| OKLCH | oklch(43.3% 0.139 276.4) |
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 #3F449B | 8.36:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #3F449B | 2.51:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #3F449B text on white | 8.36:1 | AAA | Lc 88.5 | Fine for body text |
| #3F449B text on black | 2.51:1 | Fails | Lc -13.7 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D1D7F8
oklch(88.5% 0.046 277.3)
-
Step 300
300
#B2BDF6
oklch(81% 0.082 275.9)
-
Step 400
400
#8B98F1
oklch(70.6% 0.131 276.2)
-
Step 500
500
#717CEC
oklch(63.1% 0.166 276.3)
-
Step 600
600
#5B62DA
oklch(55.6% 0.181 276.3)
-
Step 700
700
#4B50BD
oklch(49% 0.168 276.3)
-
Step 800
800 (this color)
#3F449B
oklch(43.3% 0.139 276.4)
-
Step 900
900
#34397A
oklch(37.7% 0.109 276.5)
-
Step 950
950
#1E2247
oklch(27% 0.068 276.2)
#3F449B 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) | #04529E | 0.054 |
| Deuteranopia (no green cones) | #004A99 | 0.052 |
| Tritanopia (no blue cones) | #005868 | 0.122 |
| Achromatopsia (no color) | #4E4E4E | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F449B
#3F449B
oklch(43.3% 0.139 276.4)
- #5F5000
#5F5000
oklch(43.3% 0.089 96.6)
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 #3F449B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.014
- Dark Slate Blue #483D8B ΔE 0.032
- Cobalt #1E488F ΔE 0.044
- Twilight #4E518B ΔE 0.054
- Dusk Blue #26538D ΔE 0.055
- Sapphire #2138AB ΔE 0.057
- Light Navy #155084 ΔE 0.066
- Denim Blue #3B5B92 ΔE 0.067
Use #3F449B 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.