#3F4F9E
Closest named color: Blueberry (#464196). oklch(45.7% 0.129 271.8), rgb(63, 79, 158).
Aa
White text reads best on this color (7.43:1).
About this color
#3F4F9E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.129 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.037 away. White text reads best on it, at 7.43:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.82:1 |
| White text | 7.43:1 |
Values
| HEX | #3F4F9E |
| RGB | rgb(63, 79, 158) |
| HSL | hsl(230, 43%, 43%) |
| OKLCH | oklch(45.7% 0.129 271.8) |
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 #3F4F9E | 7.43:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #3F4F9E | 2.82:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #3F4F9E text on white | 7.43:1 | AAA | Lc 85.6 | Fine for body text |
| #3F4F9E text on black | 2.82:1 | Fails | Lc -16.4 | Dividers and decoration only |
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
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#AFBEF2
oklch(80.8% 0.076 272.1)
-
Step 400
400
#869BEC
oklch(70.7% 0.121 271.9)
-
Step 500
500
#6980E6
oklch(63% 0.155 271.7)
-
Step 600
600
#5367D4
oklch(55.6% 0.168 272)
-
Step 700
700
#4455B7
oklch(49.1% 0.155 272)
-
Step 800
800 (this color)
#3F4F9E
oklch(45.7% 0.129 271.8)
-
Step 900
900
#2F3C76
oklch(37.7% 0.1 271.4)
-
Step 950
950
#1C2345
oklch(26.9% 0.064 272.7)
#3F4F9E 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) | #265AA1 | 0.036 |
| Deuteranopia (no green cones) | #15519C | 0.039 |
| Tritanopia (no blue cones) | #00616F | 0.113 |
| Achromatopsia (no color) | #555555 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4F9E
#3F4F9E
oklch(45.7% 0.129 271.8)
- #6A5500
#6A5500
oklch(45.8% 0.094 92.2)
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 #3F4F9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.037
- Twilight #4E518B ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.042
- Dusk Blue #26538D ΔE 0.042
- Cobalt #1E488F ΔE 0.050
- Dusky Blue #475F94 ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.055
Use #3F4F9E 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.