#3F4F98
Closest named color: Twilight (#4E518B). oklch(45.3% 0.12 271.6), rgb(63, 79, 152).
Aa
White text reads best on this color (7.54:1).
About this color
#3F4F98 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.120 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.031 away. White text reads best on it, at 7.54:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #3F4F98 |
| RGB | rgb(63, 79, 152) |
| HSL | hsl(229, 41%, 42%) |
| OKLCH | oklch(45.3% 0.12 271.6) |
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 #3F4F98 | 7.54:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #3F4F98 | 2.78:1 | Fails | Lc 18.0 | Dividers and decoration only |
| #3F4F98 text on white | 7.54:1 | AAA | Lc 86.0 | Fine for body text |
| #3F4F98 text on black | 2.78:1 | Fails | Lc -16.0 | 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
#B0BFEF
oklch(81% 0.07 271.2)
-
Step 400
400
#879CE7
oklch(70.7% 0.113 271.4)
-
Step 500
500
#6B82E0
oklch(63.2% 0.144 271.4)
-
Step 600
600
#5469CD
oklch(55.6% 0.156 271.6)
-
Step 700
700
#4557B2
oklch(49.2% 0.145 271.7)
-
Step 800
800 (this color)
#3F4F98
oklch(45.3% 0.12 271.6)
-
Step 900
900
#303D73
oklch(37.8% 0.093 271.1)
-
Step 950
950
#1C2443
oklch(27% 0.059 271.1)
#3F4F98 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) | #2C589B | 0.029 |
| Deuteranopia (no green cones) | #1F5196 | 0.033 |
| Tritanopia (no blue cones) | #015F6C | 0.106 |
| Achromatopsia (no color) | #545454 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4F98
#3F4F98
oklch(45.3% 0.12 271.6)
- #695300
#695300
oklch(45.2% 0.092 91)
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 #3F4F98, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.031
- Dusk Blue #26538D ΔE 0.035
- Blueberry #464196 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.037
- Cobalt #1E488F ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.048
- Dusk #4E5481 ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.050
Use #3F4F98 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.