#3F4989
Closest named color: Blueberry (#464196). oklch(43% 0.106 274.4), rgb(63, 73, 137).
Aa
White text reads best on this color (8.31:1).
About this color
#3F4989 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.106 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.033 away. White text reads best on it, at 8.31:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.52:1 |
| White text | 8.31:1 |
Values
| HEX | #3F4989 |
| RGB | rgb(63, 73, 137) |
| HSL | hsl(232, 37%, 39%) |
| OKLCH | oklch(43% 0.106 274.4) |
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 #3F4989 | 8.31:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #3F4989 | 2.52:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #3F4989 text on white | 8.31:1 | AAA | Lc 88.5 | Fine for body text |
| #3F4989 text on black | 2.52:1 | Fails | Lc -13.6 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F1
oklch(88.5% 0.035 274.9)
-
Step 300
300
#B4BEE9
oklch(80.8% 0.062 274.7)
-
Step 400
400
#8E9CDE
oklch(70.7% 0.098 274.4)
-
Step 500
500
#7382D5
oklch(63.1% 0.126 274.5)
-
Step 600
600
#5C6AC3
oklch(55.6% 0.138 274.3)
-
Step 700
700
#4C58A8
oklch(49.1% 0.128 274.3)
-
Step 800
800 (this color)
#3F4989
oklch(43% 0.106 274.4)
-
Step 900
900
#353D6D
oklch(37.7% 0.082 274.6)
-
Step 950
950
#1F2440
oklch(27% 0.052 274.7)
#3F4989 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) | #2D518B | 0.029 |
| Deuteranopia (no green cones) | #254B88 | 0.031 |
| Tritanopia (no blue cones) | #1D5762 | 0.094 |
| Achromatopsia (no color) | #4E4E4E | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4989
#3F4989
oklch(43% 0.106 274.4)
- #5F4E00
#5F4E00
oklch(42.9% 0.088 94.5)
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 #3F4989, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.033
- Twilight #4E518B ΔE 0.034
- Dark Slate Blue #483D8B ΔE 0.034
- Dusk Blue #26538D ΔE 0.036
- Cobalt #1E488F ΔE 0.039
- Dusk #4E5481 ΔE 0.045
- Light Navy #155084 ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.050
Use #3F4989 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.