#3F456C
Closest named color: Dark Grey Blue (#29465B). oklch(40.3% 0.066 276.3), rgb(63, 69, 108).
Aa
White text reads best on this color (9.21:1).
About this color
#3F456C is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.066 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.044 away. White text reads best on it, at 9.21:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #3F456C |
| RGB | rgb(63, 69, 108) |
| HSL | hsl(232, 26%, 34%) |
| OKLCH | oklch(40.3% 0.066 276.3) |
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 #3F456C | 9.21:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #3F456C | 2.27:1 | Fails | Lc 12.8 | Not readable |
| #3F456C text on white | 9.21:1 | AAA | Lc 91.2 | Preferred for body text |
| #3F456C text on black | 2.27:1 | Fails | Lc -11.2 | Not readable |
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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E8E9F1
oklch(93.6% 0.011 280.5)
-
Step 200
200
#D5D8E8
oklch(88.5% 0.022 277.5)
-
Step 300
300
#B9BFDA
oklch(80.9% 0.039 275.6)
-
Step 400
400
#969EC8
oklch(70.8% 0.062 276.3)
-
Step 500
500
#7C85B9
oklch(63% 0.079 276.3)
-
Step 600
600
#666FA5
oklch(55.7% 0.085 276.1)
-
Step 700
700
#555C8E
oklch(49.1% 0.08 276.9)
-
Step 800
800 (this color)
#3F456C
oklch(40.3% 0.066 276.3)
-
Step 900
900
#3A3F5D
oklch(37.7% 0.052 276.3)
-
Step 950
950
#222536
oklch(27% 0.032 276.3)
#3F456C 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) | #38496E | 0.014 |
| Deuteranopia (no green cones) | #35466B | 0.015 |
| Tritanopia (no blue cones) | #314D53 | 0.060 |
| Achromatopsia (no color) | #484848 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F456C
#3F456C
oklch(40.3% 0.066 276.3)
- #53481A
#53481A
oklch(40.3% 0.066 95.8)
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 #3F456C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.044
- Light Navy #155084 ΔE 0.058
- Charcoal #264653 ΔE 0.058
- Dusk #4E5481 ΔE 0.058
- Twilight Blue #0A437A ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.062
- YInMn Blue #415A77 ΔE 0.063
- Twilight #4E518B ΔE 0.063
Use #3F456C 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.