#3F4166
Closest named color: Dark Grey Blue (#29465B). oklch(39% 0.062 280.7), rgb(63, 65, 102).
Aa
White text reads best on this color (9.72:1).
About this color
#3F4166 is a dark, muted purple. In OKLCH its lightness is 39%, its chroma 0.062 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.041 away. White text reads best on it, at 9.72:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.15:1 |
| White text | 9.72:1 |
Values
| HEX | #3F4166 |
| RGB | rgb(63, 65, 102) |
| HSL | hsl(237, 24%, 32%) |
| OKLCH | oklch(39% 0.062 280.7) |
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 #3F4166 | 9.72:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #3F4166 | 2.15:1 | Fails | Lc 11.4 | Not readable |
| #3F4166 text on white | 9.72:1 | AAA | Lc 92.5 | Preferred for body text |
| #3F4166 text on black | 2.15:1 | Fails | Lc -9.9 | 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 900.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E8E9F3
oklch(93.6% 0.013 281.6)
-
Step 200
200
#D5D8EB
oklch(88.6% 0.026 278.7)
-
Step 300
300
#BABEDF
oklch(80.9% 0.047 279.8)
-
Step 400
400
#989CCF
oklch(70.8% 0.074 280.8)
-
Step 500
500
#7F82C2
oklch(63% 0.096 281.2)
-
Step 600
600
#696BAF
oklch(55.6% 0.105 281.1)
-
Step 700
700
#575996
oklch(49% 0.097 280.8)
-
Step 800
800
#47497A
oklch(42.7% 0.081 280.6)
-
Step 900
900 (this color)
#3F4166
oklch(39% 0.062 280.7)
-
Step 950
950
#232439
oklch(27% 0.039 281.4)
#3F4166 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) | #354668 | 0.019 |
| Deuteranopia (no green cones) | #334365 | 0.018 |
| Tritanopia (no blue cones) | #34484E | 0.056 |
| Achromatopsia (no color) | #444444 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4166
#3F4166
oklch(39% 0.062 280.7)
- #4D461B
#4D461B
oklch(39.1% 0.062 100.1)
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 #3F4166, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.041
- Charcoal #264653 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.062
- Charcoal Grey #3C4142 ΔE 0.063
- Dark Blue Grey #1F3B4D ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.067
- Light Navy #155084 ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.068
Use #3F4166 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.