#311F37
Closest named color: Oxford Blue (#1B263B). oklch(27.3% 0.05 317.4), rgb(49, 31, 55).
Aa
White text reads best on this color (15.19:1).
About this color
#311F37 is a dark, muted purple. In OKLCH its lightness is 27%, its chroma 0.050 and its hue 317°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.043 away. White text reads best on it, at 15.19:1.
| Hue family | Purples |
| Lightness | dark (27%) |
| Chroma | muted (0.050) |
| Temperature | in between |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.38:1 |
| White text | 15.19:1 |
Values
| HEX | #311F37 |
| RGB | rgb(49, 31, 55) |
| HSL | hsl(285, 28%, 17%) |
| OKLCH | oklch(27.3% 0.05 317.4) |
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 #311F37 | 15.19:1 | AAA | Lc -104.8 | Preferred for body text |
| Black text on #311F37 | 1.38:1 | Fails | Lc 0.0 | Not readable |
| #311F37 text on white | 15.19:1 | AAA | Lc 102.0 | Preferred for body text |
| #311F37 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
#F8F4F9
oklch(97.2% 0.008 319.4)
-
Step 100
100
#EFE7F1
oklch(93.7% 0.016 319.4)
-
Step 200
200
#E2D3E8
oklch(88.5% 0.033 316.4)
-
Step 300
300
#D1B5DA
oklch(80.9% 0.06 317.9)
-
Step 400
400
#B98EC7
oklch(70.7% 0.094 317.7)
-
Step 500
500
#A771B9
oklch(63.1% 0.12 317.4)
-
Step 600
600
#9258A5
oklch(55.6% 0.131 317.4)
-
Step 700
700
#7C488D
oklch(49.1% 0.121 317.4)
-
Step 800
800
#653B73
oklch(42.7% 0.102 317.2)
-
Step 900
900
#52335D
oklch(37.6% 0.079 316.8)
-
Step 950
950 (this color)
#311F37
oklch(27.3% 0.05 317.4)
#311F37 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) | #1B2538 | 0.042 |
| Deuteranopia (no green cones) | #202636 | 0.038 |
| Tritanopia (no blue cones) | #312228 | 0.033 |
| Achromatopsia (no color) | #262626 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #311F37
#311F37
oklch(27.3% 0.05 317.4)
- #1B2D14
#1B2D14
oklch(27.4% 0.05 137.5)
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 #311F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.044
- Dark #1B2431 ΔE 0.046
- Jet #212529 ΔE 0.048
- Eggplant #380835 ΔE 0.055
- Aubergine #3D0734 ΔE 0.057
- Gunmetal #293241 ΔE 0.059
- Dark Purple #35063E ΔE 0.062
Use #311F37 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.