#3F538E
Closest named color: Twilight (#4E518B). oklch(45.5% 0.1 268.2), rgb(63, 83, 142).
Aa
White text reads best on this color (7.39:1).
About this color
#3F538E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.100 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.021 away. White text reads best on it, at 7.39:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.83:1 |
| White text | 7.39:1 |
Values
| HEX | #3F538E |
| RGB | rgb(63, 83, 142) |
| HSL | hsl(225, 39%, 40%) |
| OKLCH | oklch(45.5% 0.1 268.2) |
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 #3F538E | 7.39:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #3F538E | 2.83:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #3F538E text on white | 7.39:1 | AAA | Lc 85.6 | Fine for body text |
| #3F538E text on black | 2.83:1 | Fails | Lc -16.5 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B0C0E7
oklch(80.9% 0.058 267.6)
-
Step 400
400
#889FDB
oklch(70.8% 0.092 267.9)
-
Step 500
500
#6B86D2
oklch(63.2% 0.119 268.1)
-
Step 600
600
#536EBF
oklch(55.6% 0.13 268.1)
-
Step 700
700
#445BA5
oklch(49% 0.122 268.6)
-
Step 800
800 (this color)
#3F538E
oklch(45.5% 0.1 268.2)
-
Step 900
900
#303F6B
oklch(37.7% 0.078 268.3)
-
Step 950
950
#1C253F
oklch(27% 0.05 268.4)
#3F538E 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) | #3B5990 | 0.017 |
| Deuteranopia (no green cones) | #31528D | 0.017 |
| Tritanopia (no blue cones) | #156069 | 0.090 |
| Achromatopsia (no color) | #565656 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F538E
#3F538E
oklch(45.5% 0.1 268.2)
- #6C5300
#6C5300
oklch(45.5% 0.093 88.4)
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 #3F538E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.021
- Denim Blue #3B5B92 ΔE 0.022
- Dusk Blue #26538D ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.030
- Dusk #4E5481 ΔE 0.030
- Dusky Blue #475F94 ΔE 0.037
- Light Navy #155084 ΔE 0.046
- Denim #3B638C ΔE 0.048
Use #3F538E 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.