#3F4E99
Closest named color: Twilight (#4E518B). oklch(45.1% 0.123 272.1), rgb(63, 78, 153).
Aa
White text reads best on this color (7.60:1).
About this color
#3F4E99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.123 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.034 away. White text reads best on it, at 7.60:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.76:1 |
| White text | 7.60:1 |
Values
| HEX | #3F4E99 |
| RGB | rgb(63, 78, 153) |
| HSL | hsl(230, 42%, 42%) |
| OKLCH | oklch(45.1% 0.123 272.1) |
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 #3F4E99 | 7.60:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #3F4E99 | 2.76:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #3F4E99 text on white | 7.60:1 | AAA | Lc 86.2 | Fine for body text |
| #3F4E99 text on black | 2.76:1 | Fails | Lc -15.9 | 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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D0D8F4
oklch(88.5% 0.04 272.9)
-
Step 300
300
#B0BEF0
oklch(80.8% 0.073 272.5)
-
Step 400
400
#889CE8
oklch(70.8% 0.114 272)
-
Step 500
500
#6B81E1
oklch(63.1% 0.146 271.9)
-
Step 600
600
#5568CF
oklch(55.6% 0.159 272.3)
-
Step 700
700
#4556B3
oklch(49% 0.148 272.1)
-
Step 800
800 (this color)
#3F4E99
oklch(45.1% 0.123 272.1)
-
Step 900
900
#303C74
oklch(37.6% 0.096 271.9)
-
Step 950
950
#1C2444
oklch(27.1% 0.06 271.3)
#3F4E99 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) | #29589C | 0.033 |
| Deuteranopia (no green cones) | #1B5097 | 0.036 |
| Tritanopia (no blue cones) | #005F6C | 0.109 |
| Achromatopsia (no color) | #545454 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E99
#3F4E99
oklch(45.1% 0.123 272.1)
- #685300
#685300
oklch(45.1% 0.092 91.8)
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 #3F4E99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.034
- Blueberry #464196 ΔE 0.034
- Dusk Blue #26538D ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.040
- Cobalt #1E488F ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.051
- Dusk #4E5481 ΔE 0.051
Use #3F4E99 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.