You will need the Washington Post Classic iOS app to use this feature. You can download it here. (If you'd rather go old-school, you can download and print out the stencils at the bottom of this page.)
Instructions for carving a pumpkin using the app:
1. Start with a medium to large pumpkin that has smoother ridges, preferably one with a flat base so it's easier to display. Set it on newspapers, grocery bags or a towel.
2. Cut a hole at the top of the pumpkin and scoop out the flesh, seeds and pulp with an ice cream scooper or soup ladle.
3. You're now ready to select your pumpkin design. Click on the "Start" button. Choose one of the stencils at the bottom of the screen. Using your phone like a camera, point it at the pumpkin, moving the image around until you like the placement and size of the stencil. Click the "Stick stencil to pumpkin" button and continue to hold your phone in one hand. With the other hand, trace the design you see on your phone onto the pumpkin with a permanent marker.
4. Now carve along the template with the knife until you've removed the interior of the stenciled area. Light a candle inside the pumpkin, replace the stem and place your jack-o'-lantern outside to enjoy.