#3F489E
Closest named color: Blueberry (#464196). oklch(44.3% 0.138 274.8), rgb(63, 72, 158).
Aa
White text reads best on this color (7.97:1).
About this color
#3F489E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.138 and its hue 275°. 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 7.97:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.63:1 |
| White text | 7.97:1 |
Values
| HEX | #3F489E |
| RGB | rgb(63, 72, 158) |
| HSL | hsl(234, 43%, 43%) |
| OKLCH | oklch(44.3% 0.138 274.8) |
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 #3F489E | 7.97:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #3F489E | 2.63:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #3F489E text on white | 7.97:1 | AAA | Lc 87.4 | Fine for body text |
| #3F489E text on black | 2.63:1 | Fails | Lc -14.8 | 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
#D0D8F8
oklch(88.6% 0.045 274.4)
-
Step 300
300
#B1BDF5
oklch(80.9% 0.08 275.1)
-
Step 400
400
#8999F1
oklch(70.7% 0.13 274.8)
-
Step 500
500
#6E7DEC
oklch(63.1% 0.166 274.8)
-
Step 600
600
#5863DA
oklch(55.6% 0.18 274.9)
-
Step 700
700
#4851BD
oklch(49% 0.168 274.8)
-
Step 800
800 (this color)
#3F489E
oklch(44.3% 0.138 274.8)
-
Step 900
900
#323A7A
oklch(37.8% 0.108 274.7)
-
Step 950
950
#1D2247
oklch(26.9% 0.068 275)
#3F489E 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) | #1155A1 | 0.048 |
| Deuteranopia (no green cones) | #004D9C | 0.049 |
| Tritanopia (no blue cones) | #005C6C | 0.120 |
| Achromatopsia (no color) | #515151 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F489E
#3F489E
oklch(44.3% 0.138 274.8)
- #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 #3F489E, 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 0.041
- Cobalt #1E488F ΔE 0.046
- Twilight #4E518B ΔE 0.049
- Dusk Blue #26538D ΔE 0.050
- Denim Blue #3B5B92 ΔE 0.059
- Sapphire #2138AB ΔE 0.061
- Light Navy #155084 ΔE 0.065
Use #3F489E 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.