#311D40
Closest named color: Oxford Blue (#1B263B). oklch(27.4% 0.067 309), rgb(49, 29, 64).
Aa
White text reads best on this color (15.21:1).
About this color
#311D40 is a dark, muted purple. In OKLCH its lightness is 27%, its chroma 0.067 and its hue 309°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.049 away. White text reads best on it, at 15.21:1.
| Hue family | Purples |
| Lightness | dark (27%) |
| Chroma | muted (0.067) |
| Temperature | in between |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.38:1 |
| White text | 15.21:1 |
Values
| HEX | #311D40 |
| RGB | rgb(49, 29, 64) |
| HSL | hsl(274, 38%, 18%) |
| OKLCH | oklch(27.4% 0.067 309) |
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 #311D40 | 15.21:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #311D40 | 1.38:1 | Fails | Lc 0.0 | Not readable |
| #311D40 text on white | 15.21:1 | AAA | Lc 102.0 | Preferred for body text |
| #311D40 text on black | 1.38:1 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EEE6F6
oklch(93.6% 0.023 308.2)
-
Step 200
200
#E2D2F0
oklch(88.6% 0.044 309.3)
-
Step 300
300
#D0B3E8
oklch(80.9% 0.08 309.4)
-
Step 400
400
#B88ADC
oklch(70.8% 0.126 309.2)
-
Step 500
500
#A66AD3
oklch(63.2% 0.162 308.9)
-
Step 600
600
#914FC0
oklch(55.7% 0.176 308.7)
-
Step 700
700
#7C3FA5
oklch(49.2% 0.163 309.2)
-
Step 800
800
#653486
oklch(42.7% 0.136 309.4)
-
Step 900
900
#522F6B
oklch(37.7% 0.105 309.2)
-
Step 950
950 (this color)
#311D40
oklch(27.4% 0.067 309)
#311D40 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) | #142541 | 0.053 |
| Deuteranopia (no green cones) | #1A263F | 0.048 |
| Tritanopia (no blue cones) | #2F232B | 0.048 |
| Achromatopsia (no color) | #262626 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #311D40
#311D40
oklch(27.4% 0.067 309)
- #1D2D04
#1D2D04
oklch(27.3% 0.066 128.7)
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 #311D40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.049
- Eggplant #380835 ΔE 0.050
- Dark Purple #35063E ΔE 0.051
- Aubergine #3D0734 ΔE 0.054
- Dark #1B2431 ΔE 0.057
- Eggplant Purple #430541 ΔE 0.058
- Deep Purple #36013F ΔE 0.060
Use #311D40 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.