#3F499A
Closest named color: Blueberry (#464196). oklch(44.2% 0.131 274.4), rgb(63, 73, 154).
Aa
White text reads best on this color (7.98:1).
About this color
#3F499A is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.131 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.022 away. White text reads best on it, at 7.98:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.63:1 |
| White text | 7.98:1 |
Values
| HEX | #3F499A |
| RGB | rgb(63, 73, 154) |
| HSL | hsl(233, 42%, 43%) |
| OKLCH | oklch(44.2% 0.131 274.4) |
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 #3F499A | 7.98:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #3F499A | 2.63:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #3F499A text on white | 7.98:1 | AAA | Lc 87.4 | Fine for body text |
| #3F499A text on black | 2.63:1 | Fails | Lc -14.7 | 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
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D0D8F6
oklch(88.6% 0.042 273.7)
-
Step 300
300
#B1BEF3
oklch(81% 0.076 273.9)
-
Step 400
400
#8A9AED
oklch(70.8% 0.123 274.5)
-
Step 500
500
#6E7EE7
oklch(63% 0.158 274.5)
-
Step 600
600
#5865D5
oklch(55.6% 0.171 274.5)
-
Step 700
700
#4853B8
oklch(49% 0.158 274.3)
-
Step 800
800 (this color)
#3F499A
oklch(44.2% 0.131 274.4)
-
Step 900
900
#323B77
oklch(37.8% 0.102 274.1)
-
Step 950
950
#1D2346
oklch(27.1% 0.065 273.9)
#3F499A 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) | #1C559D | 0.043 |
| Deuteranopia (no green cones) | #064D98 | 0.047 |
| Tritanopia (no blue cones) | #005B6A | 0.115 |
| Achromatopsia (no color) | #515151 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F499A
#3F499A
oklch(44.2% 0.131 274.4)
- #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 #3F499A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.022
- Dark Slate Blue #483D8B ΔE 0.038
- Cobalt #1E488F ΔE 0.042
- Twilight #4E518B ΔE 0.043
- Dusk Blue #26538D ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.054
- Light Navy #155084 ΔE 0.060
- Dusk #4E5481 ΔE 0.061
Use #3F499A 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.