#3F528C
Closest named color: Twilight (#4E518B). oklch(45.2% 0.098 268.6), rgb(63, 82, 140).
Aa
White text reads best on this color (7.50:1).
About this color
#3F528C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.098 and its hue 269°. 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 7.50:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.79:1 |
| White text | 7.50:1 |
Values
| HEX | #3F528C |
| RGB | rgb(63, 82, 140) |
| HSL | hsl(225, 38%, 40%) |
| OKLCH | oklch(45.2% 0.098 268.6) |
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 #3F528C | 7.50:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #3F528C | 2.79:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #3F528C text on white | 7.50:1 | AAA | Lc 86.0 | Fine for body text |
| #3F528C text on black | 2.79:1 | Fails | Lc -16.1 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B1C0E7
oklch(80.9% 0.058 268.6)
-
Step 400
400
#899EDA
oklch(70.6% 0.091 269.2)
-
Step 500
500
#6C85D0
oklch(63% 0.117 268.9)
-
Step 600
600
#546EBD
oklch(55.6% 0.127 268.4)
-
Step 700
700
#455CA3
oklch(49.2% 0.117 268.4)
-
Step 800
800 (this color)
#3F528C
oklch(45.2% 0.098 268.6)
-
Step 900
900
#313F6A
oklch(37.7% 0.076 268.9)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#3F528C 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) | #3A588E | 0.017 |
| Deuteranopia (no green cones) | #31518B | 0.018 |
| Tritanopia (no blue cones) | #185F68 | 0.088 |
| Achromatopsia (no color) | #555555 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F528C
#3F528C
oklch(45.2% 0.098 268.6)
- #6B5200
#6B5200
oklch(45.2% 0.092 88.2)
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 #3F528C, 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 0.026
- Dusk Blue #26538D ΔE 0.027
- Dusk #4E5481 ΔE 0.029
- Light Navy Blue #2E5A88 ΔE 0.030
- Dusky Blue #475F94 ΔE 0.040
- Light Navy #155084 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.047
Use #3F528C 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.