#403F63
Closest named color: Dark Grey Blue (#29465B). oklch(38.5% 0.061 284.4), rgb(64, 63, 99).
Aa
White text reads best on this color (9.95:1).
About this color
#403F63 is a dark, muted purple. In OKLCH its lightness is 39%, its chroma 0.061 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.042 away. White text reads best on it, at 9.95:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.10:1 |
| White text | 9.95:1 |
Values
| HEX | #403F63 |
| RGB | rgb(64, 63, 99) |
| HSL | hsl(242, 22%, 32%) |
| OKLCH | oklch(38.5% 0.061 284.4) |
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 #403F63 | 9.95:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #403F63 | 2.10:1 | Fails | Lc 10.9 | Not readable |
| #403F63 text on white | 9.95:1 | AAA | Lc 93.1 | Preferred for body text |
| #403F63 text on black | 2.10:1 | Fails | Lc -9.4 | 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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E8E9F3
oklch(93.6% 0.013 281.6)
-
Step 200
200
#D7D7EA
oklch(88.5% 0.026 285.9)
-
Step 300
300
#BDBDDE
oklch(80.9% 0.046 285.3)
-
Step 400
400
#9B9BCD
oklch(70.8% 0.073 284.4)
-
Step 500
500
#8381C0
oklch(63% 0.094 284.8)
-
Step 600
600
#6D6AAC
oklch(55.6% 0.101 284.7)
-
Step 700
700
#5B5894
oklch(49% 0.095 284.6)
-
Step 800
800
#4A4878
oklch(42.6% 0.079 284.4)
-
Step 900
900 (this color)
#403F63
oklch(38.5% 0.061 284.4)
-
Step 950
950
#242439
oklch(27.1% 0.039 283.5)
#403F63 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) | #344464 | 0.022 |
| Deuteranopia (no green cones) | #334262 | 0.021 |
| Tritanopia (no blue cones) | #37464C | 0.053 |
| Achromatopsia (no color) | #434343 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F63
#403F63
oklch(38.5% 0.061 284.4)
- #49451C
#49451C
oklch(38.5% 0.06 103.7)
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 #403F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.042
- Charcoal #264653 ΔE 0.054
- Charcoal Grey #3C4142 ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.064
- Onyx #343A40 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.071
Use #403F63 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.