#311555
Closest named color: Dark Indigo (#1F0954). oklch(27.7% 0.11 299.1), rgb(49, 21, 85).
Aa
White text reads best on this color (15.33:1).
About this color
#311555 is a dark, moderately saturated purple. In OKLCH its lightness is 28%, its chroma 0.110 and its hue 299°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.048 away. White text reads best on it, at 15.33:1.
| Hue family | Purples |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.110) |
| Temperature | in between |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.36:1 |
| White text | 15.33:1 |
Values
| HEX | #311555 |
| RGB | rgb(49, 21, 85) |
| HSL | hsl(266, 60%, 21%) |
| OKLCH | oklch(27.7% 0.11 299.1) |
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 #311555 | 15.33:1 | AAA | Lc -104.6 | Preferred for body text |
| Black text on #311555 | 1.36:1 | Fails | Lc 0.0 | Not readable |
| #311555 text on white | 15.33:1 | AAA | Lc 101.8 | Preferred for body text |
| #311555 text on black | 1.36:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F7F3FF
oklch(97.1% 0.016 301.2)
-
Step 100
100
#EDE5FF
oklch(93.6% 0.036 299.7)
-
Step 200
200
#DFD0FF
oklch(88.5% 0.066 299.6)
-
Step 300
300
#CAB0FF
oklch(80.8% 0.113 299)
-
Step 400
400
#B183FF
oklch(70.7% 0.179 298.9)
-
Step 500
500
#A05AFF
oklch(63% 0.233 299)
-
Step 600
600
#9117FF
oklch(55.6% 0.288 299)
-
Step 700
700
#7B00DC
oklch(49% 0.263 298.9)
-
Step 800
800
#650CB3
oklch(42.7% 0.221 299.4)
-
Step 900
900
#511B8E
oklch(37.7% 0.173 298.8)
-
Step 950
950 (this color)
#311555
oklch(27.7% 0.11 299.1)
#311555 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) | #002557 | 0.075 |
| Deuteranopia (no green cones) | #002454 | 0.075 |
| Tritanopia (no blue cones) | #292433 | 0.082 |
| Achromatopsia (no color) | #252525 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #311555
#311555
oklch(27.7% 0.11 299.1)
- #252C00
#252C00
oklch(27.7% 0.065 118.7)
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 #311555, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.048
- Dark Purple #35063E ΔE 0.051
- Deep Purple #36013F ΔE 0.055
- Eggplant Purple #430541 ΔE 0.060
- Deep Violet #490648 ΔE 0.062
- Eggplant #380835 ΔE 0.065
- Midnight Blue #191970 ΔE 0.067
- Plum Purple #4E0550 ΔE 0.068
Use #311555 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.